隔震体系对摇摆自复位高墩工作性能的影响

为提高摇摆自复位高墩的隔震性能,将铅芯橡胶支座及液体黏滞阻尼器与摇摆自复位高墩进行组合形成T 2种不同的隔震体系。以2种不同强度下的3条地震动作为输入,采用OpenSEES利用动力时程分析方法对各隔震体系的地震动响应进行了分析。通过对墩身最大剪力、墩身最大弯矩、墩顶最大位移和主梁最大位移的隔震指标及最大墩梁相对位移绝对值的对比发现:墩梁固结条件下在桥台与主梁间设置液体黏滞阻尼器的体系2和墩、梁间设置铅芯橡胶支座且在桥台与主梁间设置液体黏滞阻尼器的体系3分别适合作为软土场地和硬土场地上修建的摇摆自复位高墩的隔震体系。

Effects of seismic isolation system on working performance of rocking self-resetting high piers

In order to improve the seismic isolation performance of rocking self-resetting high piers, lead-rubber bearing and fluid viscous damper were combined with rocking self-resetting high pier, respectively to form two seismic isolation systems. 3 ground motions with two different intensities were taken as inputs, and the time history analysis method and the software OpenSEES were adopted to analyze seismic responses of the two seismic isolation systems. Through comparing seismic isolation indexes of pier,s maximum shear force, pier,s maximum bending moment, pier top, s maximum displacement and girder,s maximum displacement, and the maximum absolute value of the relative displacement between pier and girder in all seismic responses, it was shown that the isolation system 2 with fluid viscous damper located between abutment and girder under the condition of pier and girder being fixed is suitable for being built on soft soil sites, while the isolation system 3 with lead-rubber bearing located between pier and girder and fluid viscous damper located between abutment and girder is suitable for being built on hard soil sites.