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为研究采用摩擦摆支座的港珠澳隔震桥梁在氯盐腐蚀环境中抗震性能随时间的变化规律,针对前期完成的摩擦摆隔震支座人工加速腐蚀试验,拟合得出支座摩擦因数的变化曲线;进而对港珠澳隔震桥梁进行非线性时程分析,分析在不同地震波、不同峰值加速度、不同劣化时间节点下桥梁结构和支座响应随腐蚀时间的变化规律。研究结果表明:随腐蚀时间的增长,桥梁墩顶位移和加速度、墩底剪力和弯矩均呈增大趋势,支座位移则逐渐减小;在桥梁120年寿命期时,劣化幅度最大,达259.8%,说明摩擦摆支座在腐蚀环境下的性能劣化对港珠澳大桥全寿命期内的抗震性能产生了明显的不利影响,应及时对全寿命服役期内的桥梁进行检测与维护。
In order to study the variation of seismic performance of Hong Kong-Zhuhai-Macao seismic isolated bridge with rubbing pedestal in time under the environment of chloride salt corrosion, aiming at the accelerated corrosion test of pre-completed rubbed pendulum bearing, Factor curve. Then the nonlinear time-history analysis of the isolated bridges in Hong Kong-Zhuhai-Macao and Hong Kong-Zhuhai-Macao bridges was carried out to analyze the variation of the bridge structure and bearing response with the corrosion time under different seismic waves, different peak accelerations and different degradation time nodes. The results show that with the increase of corrosion time, the displacements and accelerations of pier top, the shear forces and bending moment of pier bottom all increase while the displacements of abutments decrease gradually. When the bridge reaches the 120-year service life, the degradation range is the largest, Up to 259.8%, indicating that the performance deterioration of friction pedestal in corrosive environment has a significant adverse effect on the seismic performance of Hong Kong-Zhuhai-Macao Bridge over the whole life cycle, and the bridge during full service life should be detected and maintained in time.