Timber-Concrete Composite (TCC) systems are applied widely in bridges and buildings. This study innovatively combines the eco-friendly attributes of Bamboo scrimber with Ultra-High Performance Concrete (UHPC) to develop TCC systems, leading to the formulation of Bamboo scrimber-UHPC (BS-UHPC) composites. These composites are designed to boost both mechanical behaviors and environmental sustainability. The research conducts an extensive analysis through eight series of push-out tests on BS-UHPC systems, employing diverse shear connectors such as notches, inclined bolts, and stencils. It provides an in-depth examination of the failure mechanisms, detailing general load-slip behaviors and analyzing the progression of failure. The findings reveal the influence mechanism of UHPC and shear connectors on the mechanical properties and failure modes of these composites, with notched shear connectors demonstrating the highest shear capacity with 134 kN. Additionally, the study explores the efficacy of notch connections through finite element models for parametric analysis, enabling a quantitative assessment of concrete cracking areas. Building upon these insights, the research proposes and validates theoretical models for predicting the shear capacity of these composites. Moreover, this paper employs life-cycle assessment to evaluate the environmental impact, specifically CO emissions of the BS-UHPC composites within service life, comparing them with those of traditional timber-ordinary concrete and steel-ordinary concrete systems. The results indicate that BS-UHPC composites offer significant improvements in mechanical behaviors while also achieving the lowest CO emissions with 78 kg CO-Eq/m among the materials tested. This positions BS-UHPC composites as an advantageous choice for practical engineering applications.

中文翻译：

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具有增强剪力连接件的环保竹重组材-UHPC构件的实验评估和理论建模

木-混凝土复合材料（TCC）系统广泛应用于桥梁和建筑中。这项研究创新地将重组竹的环保特性与超高性能混凝土 (UHPC) 相结合，开发 TCC 系统，从而开发出重组竹-UHPC (BS-UHPC) 复合材料的配方。这些复合材料旨在提高机械性能和环境可持续性。该研究通过对 BS-UHPC 系统进行八个系列的推出测试进行了广泛的分析，使用了不同的剪切连接器，例如槽口、倾斜螺栓和模板。它提供了对失效机制的深入检查，详细说明了一般的负载滑动行为并分析了失效的进展。研究结果揭示了 UHPC 和剪切连接器对这些复合材料的机械性能和失效模式的影响机制，其中缺口剪切连接器表现出最高的剪切能力，为 134 kN。此外，该研究还通过参数分析的有限元模型探索了缺口连接的功效，从而能够对混凝土裂缝区域进行定量评估。基于这些见解，该研究提出并验证了预测这些复合材料剪切能力的理论模型。此外，本文采用生命周期评估来评估BS-UHPC复合材料在使用寿命内的环境影响，特别是CO排放量，并将其与传统木材-普通混凝土和钢-普通混凝土体系进行比较。结果表明，BS-UHPC 复合材料在机械性能方面具有显着改善，同时在测试的材料中实现了最低的 CO 排放量，为 78 kg CO-Eq/m。这使得 BS-UHPC 复合材料成为实际工程应用的有利选择。