3塔地锚式悬索桥的减隔震分析

Seismic Mitigation and Isolation Analysis of Tri-tower Earth-anchored Suspension Bridge

为了确定3塔地锚式悬索桥有效的减隔震措施,采用非线性时程分析方法对固定、漂浮2种不同约束体系的结构动力特性及地震响应进行分析,采用粘滞阻尼器和隔震支座进行纵、横向减隔震研究,并对其效果进行分析。结果表明,设置阻尼器和隔震支座都能有效减小关键部位的位移,以及塔底的内力。通过对比,采用铅心橡胶隔震支座作为潮河大桥的减隔震装置更为合理。

In order to determine the effective seismic mitigation and isolation measure for tri-tower earth-anchored suspension bridge,the structure dynamic characteristics and seismic response was analyzed for fixed system and floating system using nonlinear time-history analysis method.Viscous fluid damper and isolation bearing were used for the research on longitudinal and transverse seismic mitigation and isolation.We analyzed the effects.The analysis results show that viscous fluid dampers and isolation bearings can effectively reduce the displacement of key parts and internal force of the tower bottom.The lead rubber isolation bearing as seismic mitigation and isolation deviceused in the Chaohe Bridge is more reasonable through the comparative analysis.