Outriggers are internal structural systems used to enhance the stiffness and strength of high-rise structures. This research investigates the efficacy of a hybrid outrigger system (HOS) which consists of one conventional and one virtual outrigger at two distinct floor levels in high-rise RCC buildings. A non-dimensional quantity, ϒ, defined as the relative stiffness ratio between the core and the diaphragm is used to describe variations in the stiffness of the building's core, stiffness of floor diaphragm, breadth, and height of the structure, in the behavioral analysis of the HOS. To investigate the efficacy and optimum locations of the hybrid outriggers, static and dynamic analysis are carried out on models with four-story heights of 140, 210, 280, and 350 m under static wind loading, uniform wind loading, equivalent static earthquake loading, and dynamic earthquake loading. Results are assessed based on the responses from roof displacement (Disp_top), base bending moment, roof acceleration (Acc_top), fundamental period, and absolute maximum inter-story drift ratio (ISD_abs.max). Based on the minimum responses of the aforementioned dependent parameters under wind and earthquake excitations, the corresponding optimum locations of hybrid outriggers are investigated. To investigate the impact of the slab on the functionality of the HOS, the behavior of shell stress variation in the tension and compression side of the slab at the outrigger floor level and the force transmission through the column at the outrigger level is analyzed. Also, the optimum location of the hybrid outriggers based on the ideal performance index (Ideal_PI) is investigated. Ideal_PI is defined as a parameter that considers the combined response of Disp_top, Acc_top, and ISD_abs.max and the criteria required for the structure under wind and seismic loads. From the behavioral analysis results, it is found that an increase in the stiffness of the slab showed an improved performance of the HOS compared to an increase in the stiffness of the core, and HOS performance can be maximized by increasing both thickness of the slab and outrigger arm length. The findings of the optimum location analysis could serve as a guide for structural engineers when selecting suitable positions for hybrid outriggers in high-rise structures.

中文翻译：

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板结构对混合支腿系统行为分析的影响

支腿是用于增强高层结构刚度和强度的内部结构系统。这项研究调查了混合支腿系统 (HOS) 的功效，该系统由位于高层 RCC 建筑中两个不同楼层的一个传统支腿和一个虚拟支腿组成。无量纲量 ϒ 定义为核心与隔板之间的相对刚度比，用于描述行为分析中建筑物核心刚度、地板隔板刚度、结构宽度和高度的变化居屋的。为了研究混合支腿的功效和最佳位置，对四层高度分别为140、210、280和350 m的模型在静风荷载、均匀风荷载、等效静地震荷载、和动态地震荷载。结果根据屋顶位移 (Disp _top )、基础弯矩、屋顶加速度 (Acc _top )、基本周期和绝对最大层间漂移比 (ISD _abs.max ) 的响应进行评估。基于上述相关参数在风和地震激励下的最小响应，研究了混合支腿的相应最佳位置。为了研究板对居屋功能的影响，分析了悬臂梁层板受拉侧和受压侧的壳应力变化行为以及悬臂梁层通过柱的力传递。此外，还研究了基于理想性能指数（理想_{PI ）的混合支腿的最佳位置。}理想_PI定义为考虑 Disp _top、 Acc _top和 ISD _abs.max的组合响应以及结构在风荷载和地震荷载下所需标准的参数。从行为分析结果来看，与核心刚度的增加相比，板刚度的增加表明 HOS 的性能得到改善，并且可以通过增加板的厚度和厚度来最大化 HOS 性能。支腿臂长。最佳位置分析的结果可以为结构工程师在高层结构中选择混合支腿的合适位置时提供指导。