【摘要】 为了改善曲线PC箱梁桥的抗震性能,基于空间有限元法,采用非线性弹簧单元模拟铅芯橡胶支座,考虑了减隔震支座的非线性特性,以一座三跨曲线PC连续箱梁桥为例,分别对设置板式橡胶支座及铅芯橡胶支座的结构体系进行了非线性动力时程地震响应分析,并研究了铅芯橡胶支座在曲线梁桥中的减隔震效果。分析结果表明:铅芯橡胶支座具有很好的减隔震效果,能显著降低下部结构的地震响应值;多维地震荷载作用下,曲线箱梁桥的受力更为不利。更多还原

【Abstract】 In order to improve seismic performance of curved box girder bridge,based on spatial finite element method,nonlinear spring element was used to simulate the lead-rubber bearing(LRB) considering its nonlinear properties.Taking a three-span curved PC box girder bridge as example,nonlinear time-history seismic response analyses were carried out respectively for bridge with plate rubber bearing and bridge with LRB structural systems.The effects of LRB in mitigating and isolating the seismic force for curved bridge were studied. The analysis results show that the LRB is quite effective as it can reduce the seismic response of substructures to great extent.Moreover,multi-dimensional earthquake excitation is more serious case for curved box girder bridge.更多还原