针形独塔斜拉桥的地震效应分析

嘉定惠平路桥主桥由于建筑景观要求很高,所以采用针形独塔斜拉桥方案。斜拉桥结构主梁和主墩固结,主塔塔底和主墩铰接,使结构在地震作用下的效应变得非常复杂。主桥结构的地震反应谱分析结果表明,边墩、过渡墩和辅助墩的支座布置形式不同对主墩的地震效应影响很大。通过不同的支座布置比选分析可以得到,边墩、过渡墩和辅助墩纵向采用速度锁定支座、横向采用抗震限位装置,主桥结构能够满足抗震要求。

On Seismic Effects Analysis of Cable-stayed Bridge with Needle-shaped Single Pylon

Due to high demands for the architectural landscape,the main bridge of Huiping Rd.Bridge in Jiading is adopting the plan of cable-stayed bridge with needle-shaped single pylon.The cable-stayed bridge structure has rigid connection between main girder and main pier and hinge joint between main pylon bottom and main pier,which will make the structure very complicated under the action of earthquake effect.The seismic response spectrum analysis of main bridge structure can show that different bearing layouts of side pier,transition pier and auxiliary pier will influence the seismic effect of main pier largely.Through the analysis of different bearing layout comparison &selection,main bridge structure can meet the requirements of seismic resistance when longitudinal adopting LUB and horizontal adopting anti-seismic stop block of side pier,transition pier and auxiliary pier.