跨越地裂缝RC框架结构钢支撑加固方法研究

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (23) : 279-287.

论文

陈帜1,2,3，熊仲明1,2,3，阳帅1,2,3，张朝1,2,3，陈轩1,2,3，王宇4

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Reinforcement method with steel supports for RC frame structure acrossing ground fissures

CHEN Zhi1,2,3, XIOANG Zhongming1,2,3, YANG Shuai1,2,3, ZHANG Chao1,2,3,CHEN Xuan1,2,3, WANG Yu4

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摘要

为了寻求高烈度地区跨越地裂缝结构合理的加固措施，以西安f4地裂缝为研究背景，结合工程实例，按照刚度比原则对跨越地裂缝RC框架结构布置钢支撑。通过振动台试验和有限元数值模拟，分析了结构的破坏形态和不同工况下支撑的应变反应，并从顶层加速度、层间位移和楼层剪力等方面对加固前后两种模型的抗震性能进行对比分析。研究结果表明：按照刚度比原则确定跨越地裂缝RC框架结构的支撑布置方式是可行的。钢支撑在结构破坏前屈服，耗散地震能量，降低结构损伤，有效提高了结构的抗震性能。同时，支撑最好在结构的上盘区域和下盘区域对称布置，可以提高结构的整体刚度，抵抗地裂缝场地的上、下盘效应。此外，钢支撑会对与其相连的RC框架柱产生附加轴力，因此为保证柱的延性要求，需要对加固后的框架柱进行轴压比验算。该研究成果可为该类跨越地裂缝结构的加固提供参考。

Abstract

In order to explore suitable braces layout on RC frame structures crossing ground fissures, an RC frame structure which is located in Xi’an and crosses a ground fissure was arranged with steel braces based on the stiffness ratio of braces with the frame structure. Shaking table test and numerical simulation were conducted to analyze the failure mode of the structure, the strain response of the braces, and the different seismic performance between the model with braces and model without braces. The research results show that it is feasible to determine the bracing layout of the RC frame structure crossing the ground fissure according to the principle of stiffness ratio. The braces yield to dissipate seismic energy before the structure failed, and structural damage is reduced, which effectively improve the seismic performance of the structure. Furthermore, the braces should be arranged symmetrically in the hanging wall and the footwall to resists the adverse effect due to the different dynamic response. Moreover, the axial forces of columns are amplified due to the retrofitting of the braces. Therefore, the axial compression ratio of the columns reinforced by braces should be checked to ensure the ductility performance of the columns.

导出引用

陈帜1,2,3，熊仲明1,2,3，阳帅1,2,3，张朝1,2,3，陈轩1,2,3，王宇4. 跨越地裂缝RC框架结构钢支撑加固方法研究[J]. 振动与冲击, 2021, 40(23): 279-287

CHEN Zhi1,2,3, XIOANG Zhongming1,2,3, YANG Shuai1,2,3, ZHANG Chao1,2,3,CHEN Xuan1,2,3, WANG Yu4. Reinforcement method with steel supports for RC frame structure acrossing ground fissures[J]. Journal of Vibration and Shock, 2021, 40(23): 279-287

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