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

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (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

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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.

Key words

ground fissure / disaster control / shaking table test / numerical simulation / reinforcement measure

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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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