不同墩柱形式的城市高架桥抗震性能研究

Research on Seismic Performance of Urban Viaducts with Different Pier Forms

摘要:

为研究不同墩柱形式对城市高架桥抗震性能的影响,选择合适的城市高架桥墩柱形式,依托3跨连续城市高架桥,采用SAP2000建立有限元模型,通过非线性时程分析结果对4种墩柱形式下城市高架桥的抗震性能进行分析。研究结果表明：城市高架桥双柱式桥墩设置盖梁和系梁会增大桥墩的横向刚度,使结构横向振动周期变小；桥墩设置盖梁和系梁会增大纵向地震作用下桥墩的受力；桥墩设置盖梁和系梁可以改变横向地震作用下桥墩的受力分布,使墩身弯矩变小,但会使剪力增大；盖梁和系梁的设置对摩擦摆支座和墩梁相对位移影响较小。研究成果可为同类型桥梁抗震设计提供参考。

Abstract:

In order to study the influence of different pier forms on the seismic performance of urban viaducts, the appropriate urban viaduct pier forms are selected. Relying on a three-span continuous urban viaduct, SAP2000 is used to establish a finite element model. The seismic performances of urban viaducts under four pier forms are analyzed by the results of nonlinear time history analysis. The results show that the installation of bent cap and tie beam on the double-column piers of urban viaducts will increase the transverse stiffness of piers and make the transverse vibration period of the structure smaller. The installation of bent cap and tie beam on the piers will increase the force of piers under the longitudinal seismic action. The installation of bent cap and tie beam can change the force distribution of piers under the transverse seismic action and make the bending moment of pier smaller, but increase the shear force. The setting of bent cap and tie beam has less effect on the relative displacement of friction pendulum bearing and pier girder. The research results can provide the reference for the seismic design of the similar bridges.