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A 3D sliced-soil–beam model for settlement prediction of tunnelling using the pipe roofing method in soft ground Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-02-02 Yu Diao, Yiming Xue, Weiqiang Pan, Gang Zheng, Ying Zhang, Dawei Zhang, Haizuo Zhou, Tianqi Zhang
The pipe roofing method is widely used in tunnel construction because it can realize a flexible section shape and a large section area of the tunnel, especially under good ground conditions. However, the pipe roofing method has rarely been applied in soft ground, where the prediction and control of the ground settlement play important roles. This study proposes a sliced-soil–beam (SSB) model to predict
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Seismic performance of HWBBF considering different design methods and structural heights Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-02-01 Yulong Feng, Zhi Zhang, Zuanfeng Pan
Previous research has shown that using buckling-restrained braces (BRBs) at hinged wall (HW) base (HWBB) can effectively mitigate lateral deformation of steel moment-resisting frames (MRFs) in earthquakes. Force-based and displacement-based design methods have been proposed to design HWBB to strengthen steel MRF and this paper comprehensively compares these two design methods, in terms of design steps
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Hard-rock tunnel lithology identification using multi-scale dilated convolutional attention network based on tunnel face images Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-02-01 Wenjun Zhang, Wuqi Zhang, Gaole Zhang, Jun Huang, Minggeng Li, Xiaohui Wang, Fei Ye, Xiaoming Guan
For real-time classification of rock-masses in hard-rock tunnels, quick determination of the rock lithology on the tunnel face during construction is essential. Motivated by current breakthroughs in artificial intelligence technology in machine vision, a new automatic detection approach for classifying tunnel lithology based on tunnel face images was developed. The method benefits from residual learning
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A theoretical model for investigating shear lag in composite cable-stayed bridges Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-02-01 Wenting Zhang, Lan Duan, Chunsheng Wang, Weihua Ren
The slab of the composite girder is usually very wide in composite cable-stayed bridges, and the main girder has an obvious shear lag. There is an axial force in the main girder due to cable forces, which changes the normal stress distribution of the composite girder and affects the shear lag. To investigate the shear lag in the twin I-shaped composite girder (TICG) of cable-stayed bridges, analytical
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Numerical simulation of rime ice accretion on a three-dimensional wind turbine blade using a Lagrangian approach Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-01-23 Tiange Zhang, Xuanyi Zhou, Zhenbiao Liu
The accreted ice on wind turbine blades significantly deteriorates the blade aerodynamic performance and consequently the power production. The existing numerical simulations of blade icing have mostly been performed with the Eulerian approach for two-dimensional (2D) blade profiles, neglecting the possible three-dimensional (3D) rotating effect. This paper conducts a numerical simulation of rime ice
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An isogeometric approach to free vibration analysis of bi-directional functionally graded porous doubly-curved shallow microshells with variable length-scale parameters Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-01-23 Khuat Duc Duong, Dao Nhu Mai, Phung Van Minh, Tran Van Ke
This study uses iso-geometric investigation, which is based on the non-uniform rational B-splines (NURBS) basis function, to investigate natural oscillation of bi-directional functionally graded porous (BFGP) doubly-curved shallow microshells placed on Pasternak foundations with any boundary conditions. The characteristics of the present material vary in both thickness and axial directions along the
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Real-time prediction of tunnel face conditions using XGBoost Random Forest algorithm Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-01-23 Lei-jie Wu, Xu Li, Ji-dong Yuan, Shuang-jing Wang
Real-time perception of rock conditions based on continuously collected data to meet the requirements of continuous Tunnel Boring Machine (TBM) construction presents a critical challenge that warrants increased attention. To achieve this goal, this paper establishes real-time prediction models for fractured and weak rock mass by comparing 6 different algorithms using real-time data collected by the
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Comprehensive experimental database and analysis of circular concrete-filled double-skin tube stub columns: A review Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-01-23 Hongyuan Tang, Hongfei Tan, Sisi Ge, Jieyu Qin, Yuzhuo Wang
A concrete-filled double-skin tube (CFDST) is a new type of composite material. Experimental studies have been conducted to investigate the axial compression behavior of CFDST members for approximately 30 years. This paper provides a review of the status of axial compression bearing capacity tests conducted on circular CFDST stub columns as well as a summary of test data for 165 circular CFDST stub
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Calibration method of mesoscopic parameter in sandy cobble soil triaxial test based on PFC3D Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-01-13 Pengfei Li, Xiaopu Cui, Yingjie Wei, Junwei Xia, Xinyu Wang
This paper presents a rapid and effective calibration method of mesoscopic parameters of a three-dimensional particle flow code (PFC3D) model for sandy cobble soil. The method is based on a series of numerical tests and takes into account the significant influence of mesoscopic parameters on macroscopic parameters. First, numerical simulations are conducted, with five implementation steps. Then, the
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Microcapsule-enabled self-healing concrete: A bibliometric analysis Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-01-13 Shuai Zhou, Zijian Li, Kai Li, Yue Jia, Chong Wang, Xiaoying Zhuang
With the development of self-healing technology, the overall properties of the microcapsule-enabled self-healing concrete have taken a giant leap. In this research, a detailed assessment of current research on the microcapsule-enabled self-healing concrete is conducted, together with bibliometric analysis. In the bibliometric analysis, various indicators are considered. The current state of progress
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Seismic design and analysis of a high-rise self-centering wall building: Case study Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-01-12 Ying Zhou, Rui Wang, Yiqiu Lu
Post-tensioning self-centering walls are a well-developed and resilient technology. However, despite extensive research, the application of this technology has previously been limited to low-rise buildings. A ten-story self-centering wall building has now been designed and constructed using the state-of-art design methodologies and construction detailing, as described in this paper. The building is
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A surrogate model for uncertainty quantification and global sensitivity analysis of nonlinear large-scale dome structures Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-01-12 Huidong Zhang, Yafei Song, Xinqun Zhu, Yaqiang Zhang, Hui Wang, Yingjun Gao
Full-scale dome structures intrinsically have numerous sources of irreducible aleatoric uncertainties. A large-scale numerical simulation of the dome structure is required to quantify the effects of these sources on the dynamic performance of the structure using the finite element method (FEM). To reduce the heavy computational burden, a surrogate model of a dome structure was constructed to solve
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Mechanical behavior and permeability properties of sustainable and high-performance anisotropic three-dimensional printable concrete Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-01-12 Fatih Özalp
Three-dimensional printable concrete requires further development owing to the challenges encountered, including its brittle behavior, high cement requirement for the buildability of layers, and anisotropic behavior in different directions. The aim of this study is to overcome these challenges. First, three-dimensional printable concrete mixtures were prepared using silica fume, ground blast furnace
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Drainage design combining drain holes and pinholes for tunnel boring machine segments subject to high water pressure Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-01-12 Yao Lu, Ming Huang, Zhijie Chen, Zisheng Zeng, Yuchuan Liu, Guangzhao Du
Balance of the groundwater and ecology is crucial for controlled discharge. However, regarding the segments of tunnel boring machines (TBMs) under high water pressure, the stability of the lining structure is often reduced by excessive drain holes required to achieve this balance. The large discharge of pinholes can easily have severe consequences, such as the lowering of the groundwater table, drying
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Properties and printability evaluation of three-dimensional printing magnesium oxychloride cement by fully utilizing aeolian sand Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-01-12 Qinghua Wang, Jinggang Xu, Duo Feng, Wei Li, Yuanyuan Zhou, Qiao Wang
Three-dimensional concrete printing (3DCP) is increasingly being applied in harsh environments and isolated regions. However, the effective utilization of aeolian sand (AS) resources and by-products derived from arid zones for 3DCP is yet to be fully realized. This study developed a three-dimensional (3D) printing composite using AS and magnesium oxychloride cement (MOC) from local materials. The effects
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Reliability analysis of excavated slopes in undrained clay Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-01-12 Shuang Shu, Bin Ge, Yongxin Wu, Fei Zhang
A novel approach based on the upper bound theory is proposed to assess the stability of excavated slopes with spatially variable clay in undrained conditions. The proposed random limit analysis is a combination of the deterministic slope stability limit analysis together with random field theory and Monte Carlo simulation. A series of analyses is conducted to verify the potential application of the
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Investigation of the first quasi-rectangular metro tunnel constructed by the 0−θ method Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-01-11 Peinan Li, Xue Liu, Xi Jiang, Xuehui Zhang, Jun Wu, Peixin Chen
Quasi-rectangular shield tunneling is a cutting-edge trenchless method for constructing metro tunnels with double tubes, owing to its advantages in saving underground space and reducing ground disturbance. However, the conventional quasi-rectangular shield tunneling method is not applicable when constructing a tunnel without a center pillar, such as a scissor crossover section of a metro line. Therefore
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Experimental and numerical evaluation of multidirectional compressive and flexure behavior of three-dimensional printed concrete Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-01-11 Lalit Kumar, Dhrutiman Dey, Biranchi Panda, Nelson Muthu
Three-dimensional concrete printing (3DCP) can proliferate the industrialization of the construction sector, which is notoriously conservative and indolent toward changes. However, the mechanical behavior of 3DCP should be characterized and modeled considering the interfaces when its performance is thoroughly compared to that of the existing concrete construction methods. This study presents an experimental
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Clogging of slurry-shield tunnel-boring machine drives in sedimentary soft rock: A case study Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2024-01-08 Chengyong Cao, Xiangsheng Chen, Chenghua Shi, Yanbin Fu, Chenjie Gong, Zuxian Wang
This paper presents a case study of the clogging of a slurry-shield tunnel-boring machine (TBM) experienced during tunnel operations in clay-rich argillaceous siltstones under the Ganjiang River, China. The clogging experienced during tunneling was due to special geological conditions, which had a considerably negative impact on the slurry-shield TBM tunneling performance. In this case study, the effect
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Improved prediction of pile bending moment and deflection due to adjacent braced excavation Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-12-29 Chana Phutthananon, Pornkasem Jongpradist, Duangkamol Sirirak, Prateep Lueprasert, Pitthaya Jamsawang
Deep excavations in dense urban areas have caused damage to nearby existing structures in numerous past construction cases. Proper assessment is crucial in the initial design stages. This study develops equations to predict the existing pile bending moment and deflection produced by adjacent braced excavations. Influential parameters (i.e., the excavation geometry, diaphragm wall thickness, pile geometry
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Influence of advanced engineering measures on displacement and stress field of surrounding rock in tunnels crossing active strike-slip faults Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-12-29
Abstract Based on significant improvements in engineering materials, three advanced engineering measures have been proposed—super anchor cables, high-strength concrete anti-fault caverns, and grouting modification using high-strength concrete-to resist fault dislocation in the surrounding rock near tunnels crossing active strike-slip faults. Moreover, single- or multiple-joint advanced engineering
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Microbial self-healing of cracks in cement-based materials and its influencing factors Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-12-29
Abstract Cement-based materials are brittle and crack easily under natural conditions. Cracks can reduce service life because the transport of harmful substances can cause corrosion damage to the structures. This review discusses the feasibility of using microbial self-healing agents for crack healing. Tubular and spherical carriers can be used to load microbial self-healing agents and protect microbes
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Confinement properties of circular concrete columns wrapped with prefabricated textile-reinforced fine concrete shells Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-12-29
Abstract This paper proposes an innovative column composed of a core column (including both reinforced concrete (RC) and plain concrete (PC) columns) and a prefabricated textile-reinforced fine concrete (TRC) shell. To study the confinement properties of TRC shells on this novel type of concrete column, 20 circular specimens, including 12 PC columns and 8 RC columns, were prepared for axial compressive
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A time–space porosity computational model for concrete under sulfate attack Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-12-29 Hui Song, Jiankang Chen
The deterioration of the microscopic pore structure of concrete under external sulfate attack (ESA) is a primary cause of degradation. Nevertheless, little effort has been invested in exploring the temporal and spatial development of the porosity of concrete under ESA. This study proposes a mechanical–chemical model to simulate the spatiotemporal distribution of the porosity. A relationship between
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Dynamic performance of submerged floating tunnel with different mooring styles subjected to anchor cable failure Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-12-29
Abstract Submerged floating tunnels (SFTs) are novel structures for transportation across long- and deep-strait regions. Owing to severe wave and current excitation as well as the effects of underwater structures and corrosion, the risk of local anchor cable failure is high, which can result in the progressive failure of the entire structure. In this study, experimental and numerical investigations
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Printability and hardening performance of three-dimensionally-printed geopolymer based on lunar regolith simulant for automated construction of lunar infrastructure Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-12-29 Feng Li, Rongrong Zhang, Siqi Zhou, Xingyi Zhu
Using an in situ lunar regolith as a construction material in combination with 3D printing not only reduces the weight of materials carried from the Earth but also improves the automation of lunar infrastructure construction. This study aims to improve the printability of a geopolymer based on a BH-1 lunar regolith simulant, including the extrudability, open time, and buildability, by controlling the
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A frequency error estimation for isogeometric analysis of Kirchhoff–Love cylindrical shells Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-12-28 Zhuangjing Sun, Xiaolan Xu, Zhiwei Lin, Dongdong Wang
A frequency error estimation is presented for the isogeometric free vibration analysis of Kirchhoff–Love cylindrical shells using both quadratic and cubic basis functions. By analyzing the discrete isogeometric equations with the aid of harmonic wave assumption, the frequency error measures are rationally derived for the quadratic and cubic formulations for Kirchhoff–Love cylindrical shells. In particular
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Aerodynamic stability evolution tendency of suspension bridges with spans from 1000 to 5000 m Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-12-12 Yejun Ding, Lin Zhao, Rong Xian, Gao Liu, Haizhu Xiao, Yaojun Ge
Aerodynamic instability owing to aerostatic and flutter-related failures is a significant concern in the wind-resistant design of long-span suspension bridges. Based on the dynamic characteristics of suspension bridges with spans ranging from 888 to 1991 m, we proposed fitted equations for increasing spans and base frequencies. Finite element models of suspension bridges with increasing span from 1000
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Displacement and force analyses of piles in the pile-caisson composite structure under eccentric inclined loading considering different stratum features Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-12-12 Xiaoqing Zhao, Jinchang Wang, Panpan Guo, Xiaonan Gong, Yongle Duan
A novel anchorage for long-span suspension bridges, called pile-caisson composite structures, was recently proposed by the authors in an attempt to reduce the construction period and costs. This study aims to investigate the displacement and force behavior of piles in a pile-caisson composite structure under eccentric inclined loading considering different stratum features. To this end, both 1g model
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Ductility improvement of GFRP-RC beams using precast confined concrete block in compression zone Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-12-12 Nooshin G. Amirabad, Farshid J. Alaee, Meysam Jalali
Fiber-reinforced polymers (FRPs) have received considerable research attention because of their high strength, corrosion resistance, and low weight. However, owing to the lack of ductility in this material and the quasi-brittle behavior of concrete, FRP-reinforced concrete (FRP-RC) beams, even with flexural failure, do not fail in a ductile manner. Because the limited deformation capacity of FRP-RC
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Experimental study on the stratum applicability and mechanisms of bubble-slurry for earth pressure balance shields Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-12-05 Lu Wang, Wei Zhu, Yongjin Qian
Soil conditioning is essential for addressing the stratum applicability problem of earth pressure balance (EPB) shields. Under high water pressures, EPB shields spew water and soil when excavating coarse-grained strata. Typically, foam combined with polymers and slurry is used to solve spewing. However, in current techniques, slurry, foam, and the other agents are mixed with soil separately, their
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Field and laboratory experimental studies on hard-rock tunnel excavation based on disc cutter coupled with high-pressure waterjet Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-12-04 He Fei, Yiqiang Lu, Jinliang Zhang, Xingchen Luo, Yimin Xia
The tunnel boring machine (TBM) is typically used in hard-rock tunnel excavation. Owing to the unsatisfactory adaptability of TBM to the surrounding rock, when crossing high-strength and high-wear strata, the TBM can easily cause defects, such as abnormal wear on cutters and overload damage to bearings, thus affecting the construction efficiency and cost. Therefore, high-pressure waterjet technology
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Acoustic emissions evaluation of the dynamic splitting tensile properties of steel fiber reinforced concrete under freeze–thaw cycling Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-11-23 Hua Zhang, Xinyue Liu, Lingyu Bai, Shanshan Ji, Luoyu Pan, Xuechen Li
This study empirically investigated the influence of freeze–thaw cycling on the dynamic splitting tensile properties of steel fiber reinforced concrete (SFRC). Brazilian disc splitting tests were conducted using four loading rates (0.002, 0.02, 0.2, and 2 mm/s) on specimens with four steel fiber contents (0%, 0.6%, 1.2%, and 1.8%) subjected to 0 and 50 freeze–thaw cycles. The dynamic splitting tensile
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Compressive strength prediction and optimization design of sustainable concrete based on squirrel search algorithm-extreme gradient boosting technique Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-11-24 Enming Li, Ning Zhang, Bin Xi, Jian Zhou, Xiaofeng Gao
Concrete is the most commonly used construction material. However, its production leads to high carbon dioxide (CO2) emissions and energy consumption. Therefore, developing waste-substitutable concrete components is necessary. Improving the sustainability and greenness of concrete is the focus of this research. In this regard, 899 data points were collected from existing studies where cement, slag
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Microdamage study of granite under thermomechanical coupling based on the particle flow code Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-11-17 Chong Shi, Yiping Zhang, Yulong Zhang, Xiao Chen, Junxiong Yang
The thermomechanical coupling of rocks refers to the interaction between the mechanical and thermodynamic behaviors of rocks induced by temperature changes. The study of this coupling interaction is essential for understanding the mechanical and thermodynamic properties of the surrounding rocks in underground engineering. In this study, an improved temperature-dependent linear parallel bond model is
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Effects of time-varying liquid bridge forces on rheological properties, and resulting extrudability and constructability of three-dimensional printing mortar Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-11-20 Peng Zhi, Yu-Ching Wu, Timon Rabczuk
Extrudability and constructability are two important, yet contradictory issues pertaining to the construction of three-dimensional (3D) printing concrete. Extrudability is easily achieved when 3D printing cement mortar has a high water content and low cohesion, but the printed structure is easily collapsible. However, a 3D printing cement mortar with a low water content and high cohesion has a relatively
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Thermo-mechanical simulation of frost heave in saturated soils Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-11-17 Saeed Vosoughian, Romain Balieu
Roads are exposed to various degradation mechanisms during their lifetime. The pavement deterioration caused by the surrounding environment is particularly severe in winter when the humidity and subfreezing temperatures prevail. Frost heave-induced damage is one of the winter-related pavement deterioration. It occurs when the porewater in the soil is exposed to freezing temperatures. The study of frost
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Optimization design of anti-seismic engineering measures for intake tower based on non-dominated sorting genetic algorithm-II Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-11-13 Jia’ao Yu, Zhenzhong Shen, Zhangxin Huang, Haoxuan Li
High-rise intake towers in high-intensity seismic areas are prone to structural safety problems under vibration. Therefore, effective and low-cost anti-seismic engineering measures must be designed for protection. An intake tower in northwest China was considered the research object, and its natural vibration characteristics and dynamic response were first analyzed using the mode decomposition response
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Optimization of the mechanical performance and damage failure characteristics of laminated composites based on fiber orientation Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-11-13 Hussein Dalfi, Anwer Al-Obaidi, Abdalameer Tariq, Hussein Razzaq, Roham Rafiee
In this study, the effect of fiber angle on the tensile load-bearing performance and damage failure characteristics of glass composite laminates was investigated experimentally, analytically, and numerically. The glass fabric in the laminate was perfectly aligned along the load direction (i.e., at 0°), offset at angles of 30° and 45°, or mixed in different directions (i.e., 0°/30° or 0°/45°). The composite
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Influence of freeze–thaw damage gradient on stress–strain relationship of stressed concrete Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-11-06 Xiguang Liu, Yongjie Lei, Yihao Sun, Jiali Zhou, Ditao Niu
Freeze–thaw damage gradients lead to non-uniform degradation of concrete mechanical properties at different depths. A study was conducted on the stress–strain relationship of stressed concrete with focus on the freeze–thaw damage gradient. The effects of relative freeze–thaw depths, number of freeze–thaw cycles (FTCs) and stress ratios on the stress–strain curves of concrete were analyzed. The test
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Analyzing the characterization of pore structures and permeability of diesel contaminated clays under different aging conditions Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-10-28 Yeyang Chun, Dong Zhou, Zonghui Liu, Chenhui Liu, Tenglong Liang, Dongpo Su, Zheng Huang
In this study, mercury intrusion porosimetry (MIP) and X-ray micro-computed tomography (XRμCT) were used to characterize the pore structures and investigate the permeability characteristics of clay after aging and contamination with diesel. The results of the MIP tests showed that aging leads to reductions in porosity and average diameter, as well as an increase in tortuosity. The XRμCT analysis yielded
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Influence of surface cracking, anchor head profile, and anchor head size on cast-in headed anchors in geopolymer concrete Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-10-28 Trijon Karmokar, Alireza Moyheddin
In this study, the concrete cone capacity, concrete cone angle, and load–displacement response of cast-in headed anchors in geopolymer concrete are explored using numerical analyses. The concrete damaged plasticity (CDP) model in ABAQUS is used to simulate the behavior of concrete substrates. The tensile behavior of anchors in geopolymer concrete is compared with that in normal concrete as well as
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Exploring the mechanical properties of steel- and polypropylene-reinforced ultra-high-performance concrete through numerical analyses and experimental multi-target digital image correlation Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-10-23 Behrooz Dadmand, Hamed Sadaghian, Sahand Khalilzadehtabrizi, Masoud Pourbaba, Amir Mirmiran
This study presents experimental and numerical investigations on the mechanical properties of ultrahigh- performance concrete (UHPC) reinforced with single and hybrid micro- and macro-steel and polypropylene fibers. For this purpose, a series of cubic, cylindrical, dog-bone, and prismatic beam specimens (total fiber by volume = 1%, and 2%) were tested under compressive, tensile, and flexural loadings
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Effects of green roof damping and configuration on structural seismic response Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-10-23 Jenika McClay, Jenna Wong
Sustainable structures are critical for addressing global climate change. Hence, their structural resilience or ability to recover from natural events must be considered comprehensively. Green roofs are a widely used sustainable feature that improve the environment while providing excellent occupant amenity. To expand their usage, their inherent damping and layout sensitivity to seismic performance
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Damage assessment and diagnosis of hydraulic concrete structures using optimization-based machine learning technology Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-10-14 Yantao Zhu, Qiangqiang Jia, Kang Zhang, Yangtao Li, Zhipeng Li, Haoran Wang
Concrete is widely used in various large construction projects owing to its high durability, compressive strength, and plasticity. However, the tensile strength of concrete is low, and concrete cracks easily. Changes in the concrete structure will result in changes in parameters such as the frequency mode and curvature mode, which allows one to effectively locate and evaluate structural damages. In
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Large-scale model test study on the water pressure resistance of construction joints of karst tunnel linings Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-10-11 Meng Huang, Mingli Huang, Ze Yang, Yuan Song, Zhien Zhang
Model tests and numerical calculations were adopted based on the New Yuanliangshan tunnel project to investigate the water pressure resistance of lining construction joints in high-pressure and water-rich karst tunnels. A large-scale model test was designed and conducted, innovatively transforming the external water pressure of the lining construction joint into internal water pressure. The effects
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Parametric study on seismic performance of self-centering reinforced concrete column with bottom-placed rubber layer Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-10-11 Yangchao Ru, Liusheng He, Huanjun Jiang
To realize seismic-resilient reinforced concrete (RC) moment-resisting frame structures, a novel self-centering RC column with a rubber layer placed at the bottom (SRRC column) is proposed herein. For the column, the longitudinal reinforcement dissipates seismic energy, the rubber layer allows the rocking of the column, and the unbonded prestressed tendon enables self-centering capacity. A refined
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Preparation, with graphene, of novel biomimetic self-healing microcapsules with high thermal stability and conductivity Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-09-28 Ying-Yuan Wang, Yi-Qiu Tan
This paper reports a comparative study of microcapsules with enhanced thermal stability and electrical conductivity inspired by the bionic thermal insulation of birds’ feathers for self-healing aged asphalt. The work is based on an in situ polymerization with composite shell components of graphene and hexamethoxymethylmelamine resin. By using graphene, microcapsules with rough surfaces are achieved
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Elevated temperature creep model of parallel wire strands Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-09-23 Yong Du, Yongjin Wu, Abdullahi M. Umar, Shaojun Zhu
Parallel wire strands (PWSs), which are widely used in prestressed steel structures, are typically in high-stress states. Under fire conditions, significant creep effects occur, reducing the prestress and influencing the mechanical behavior of PWSs. As there is no existing approach to analyze their creep behavior, this study experimentally investigated the elevated temperature creep model of PWSs.
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Numerical and experimental analyses of methane leakage in shield tunnel Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-09-23 Jie He, Hehua Zhu, Xiangyang Wei, Rui Jin, Yaji Jiao, Mei Yin
Tunnels constructed in gas-bearing strata are affected by the potential leakage of harmful gases, such as methane gas. Based on the basic principles of computational fluid dynamics, a numerical analysis was performed to simulate the ventilation and diffusion of harmful gases in a shield tunnel, and the effect of ventilation airflow speed on the diffusion of harmful gases was evaluated. As the airflow
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Linear viscoelastic behavior of asphalt binders and mixtures containing very high percentages of reclaimed asphalt pavement Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-09-18 Reza Imaninasab, Luis Loria-Salazar, Alan Carter
The primary aim of this study is to correlate the impact of aggregates, if any, on the viscoelastic behavior of rejuvenated asphalt mixtures containing very high amounts of reclaimed asphalt pavement (RAP) (> 50%). First, gradation of 100% RAP was rectified, using a modified Bailey method by adding virgin aggregates to achieve two coarse dense-graded and one fine dense-graded blends. Complex modulus
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Lateral shear performance of sheathed post-and-beam wooden structures with small panels Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-09-14 Weiguo Long, Wenfan Lu, Yifeng Liu, Qiuji Li, Jiajia Ou, Peng Pan
Sheathed post-and-beam wooden structures are distinct from light-wood structures. They allow for using sheathing panels that are smaller (0.91 m × 1.82 m) than standard-sized panels (1.22 m × 2.44 m or 2.44 m × 2.44 m). Evidence indicates that nail spacing and panel thickness determine the lateral capacity of the wood frame shear walls. To verify the lateral shear performance of wood frame shear walls
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Full-scale site evaluation of ventilation expressway embankments underlain by warm permafrost along the Gonghe–Yushu Expressway Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-09-14 Shuangjie Wang, Qi Zhang, Yuanhong Dong, Kun Yuan, Binhua Hu, Huilong Zhao, Nanlu Zhao
Ventilation embankments, including those with forced ventilation, natural ventilation, and combination of these, were adopted for the construction of the Gonghe–Yushu Expressway in warm permafrost areas. To evaluate the actual thermal performance of ventilation embankment in the Qinghai–Tibet Plateau, four types of ventilation embankments were selected as objects, and their long-term thermal characteristics
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Development of combined transitional pavement structure for urban tram track-road grade crossings Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-09-14 Boshun Gao, Xin Xiao, Jiayu Wang, Ligao Jiang, Qing Yao
The grade crossings and adjacent pavements of urban trams are generally subjected to complex load conditions and are susceptible to damage. Therefore, in this study, a novel pavement structure between tram tracks and roads constructed using polyurethane (PU) elastic concrete and ultra-high-performance concrete (UHPC), referred to as a track-road transitional pavement (TRTP), is proposed. Subsequently
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Multi-harmonic forced vibration and resonance of simple beams to moving vehicles Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-09-02 Zhi Sun, Limin Sun, Ye Xia
This study modeled the moving-vehicle-induced forcing excitation on a single-span prismatic bridge as a multiple frequency-multiplication harmonic load on the modal coordinates of a linear elastic simple Euler–Bernoulli beam, and investigated the forced modal oscillation and resonance behavior of this type of dynamic system. The forced modal responses consist of multiple frequency-multiplication steady-state
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Reliability-based design optimization of offshore wind turbine support structures using RBF surrogate model Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-09-01 Changhai Yu, Xiaolong Lv, Dan Huang, Dongju Jiang
An efficient reliability-based design optimization method for the support structures of monopile offshore wind turbines is proposed herein. First, parametric finite element analysis (FEA) models of the support structure are established by considering stochastic variables. Subsequently, a surrogate model is constructed using a radial basis function (RBF) neural network to replace the time-consuming
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Nonlinear dynamic analysis of functionally graded carbon nanotube-reinforced composite plates using MISQ20 element Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-09-01 Quoc-Hoa Pham, Trung Thanh Tran, Phu-Cuong Nguyen
The main objective of this study is to further extend the mixed integration smoothed quadrilateral element with 20 unknowns of displacement (MISQ20) to investigate the nonlinear dynamic responses of functionally graded carbon nanotube-reinforced composite (FG-CNTRC) plates with four types of carbon nanotube distributions. The smooth finite element method is used to enhance the accuracy of the Q4 element
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A simplified method for investigating the bending behavior of piles supporting embankments on soft ground Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-09-01 Yu Diao, Yuhao Guo, Zhenyang Jia, Gang Zheng, Weiqiang Pan, Dongfan Shang, Ying Zhang
In recent years, concrete and reinforced concrete piles have been widely used to stabilize soft ground under embankments. Previous research has shown that bending failure, particularly during rapid filling on soft ground, is the critical failure mode for pile-supported embankments. Here, we propose an efficient two-stage method that combines a test-verified soil deformation mechanism and Poulos’ solution
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Strengthening of reinforced concrete beams using fiber-reinforced cementitious matrix systems fabricated with custom-designed mortar and fabrics Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-09-01 Ahmadreza Ramezani, Mohammad Reza Esfahani, Javad Sabzi
The performance of a new fiber-reinforced cementitious matrix (FRCM) system developed using custom-designed mortar and fabrics is investigated in this study. The behavior of this system is evaluated in terms of both the flexural and shear strengthening of reinforced concrete beams. Eight beams are designed to assess the effectiveness of the FRCM system in terms of flexural strengthening, and four specimens
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Dynamic prediction of moving trajectory in pipe jacking: GRU-based deep learning framework Front. Struct. Civ. Eng. (IF 3.0) Pub Date : 2023-08-10 Yi-Feng Yang, Shao-Ming Liao, Meng-Bo Liu
The moving trajectory of the pipe-jacking machine (PJM), which primarily determines the end quality of jacked tunnels, must be controlled strictly during the entire jacking process. Developing prediction models to support drivers in performing rectifications in advance can effectively avoid considerable trajectory deviations from the designed jacking axis. Hence, a gated recurrent unit (GRU)-based