Seismic performance of a double-column bridge retrofitted with a self-centering damper with a zero secondary stiffness and a pendulum-based inerter in parallel
ZHANG Zhenhua,ZHANG Jingsi,WANG Lei
School of Civil Engineering, Henan Polytechnic University, Jiaozuo 45400, China
Abstract:A novel damping system (IZSCD), consisting of a pendulum-based inerter (PI) and a self-centering damper with zero secondary stiffness (ZSCD) in parallel, was proposed to retrofit the double-column bridge bent, aiming to reduce the increment of base shear and acceleration of the bridge induced by the self-centering dampers (SCDs). Through the convolution integral and numerical calculation of the equivalent linearized single-degree-of-freedom system of the retrofitted structure, the displacement response spectrum of the system with inerter was developed and verified. Based on this spectrum, the seismic design of the bridge bents with IZSCD was carried out by the direct displacement-based design method, which was verified by elastic-plastic time history analysis. The effects of inertance-mass ratio and amplification factor of the lever on the seismic performance of the retrofitted bridge bents were then investigated. The results shows that IZSCD can effectively mitigate the acceleration and the base shear of the bridge bent with SCD. The research supply a method and a guideline for retrofitting the double-column bridge bent to consider the displacement, base shear and acceleration simultaneously.
张振华,张静思,王磊. 摆式惯容-零二次刚度自复位阻尼器并联加固双柱墩抗震性能研究[J]. 振动与冲击, 2022, 41(12): 75-83.
ZHANG Zhenhua,ZHANG Jingsi,WANG Lei. Seismic performance of a double-column bridge retrofitted with a self-centering damper with a zero secondary stiffness and a pendulum-based inerter in parallel. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(12): 75-83.
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