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以一座墩高相差较大的装配式桥梁为例,基于Midas Civil程序采用非线性时程分析方法进行E2地震作用下抗震验算。计算结果表明:全部采用板式橡胶支座时E2地震作用下矮墩抗剪能力不满足要求;矮墩部位采用铅芯隔震橡胶支座时能够延长结构自振周期,减小地震力,矮墩抗剪强度满足要求。从分析结果可知,桥墩较高,且下部结构刚度不大时,采用板式橡胶支座也能满足抗震要求。工程设计中,结合桥梁抗震设防要求,根据实际需求合理选用铅芯橡胶支座或板式橡胶支座。
Taking an assembled bridge with large difference in pier height as an example, a nonlinear time history analysis method based on the Midas Civil program is used for seismic checking under the E2 earthquake. The calculation results show that the shear resistance of the short pier under E2 earthquake does not meet the requirements when the rubber bearings are all plate-type rubber bearing. When the lead-core rubber bearings are used in the short pier, the natural period of the structure can be prolonged to reduce the seismic force, Shear strength to meet the requirements. It can be seen from the analysis results that when the piers are high and the rigidity of the lower structure is not large, the rubber bearing plate can also meet the seismic requirements. Engineering design, combined with the seismic requirements of the bridge, according to the actual needs of a reasonable choice of lead-rubber bearings or rubber bearings.