常德沅江西大桥主桥抗震性能研究

Study of Seismic Performance of Main Bridge of Chang De-yuan Jiangxi Bridge

常德沅江西大桥主桥为(132+264+132) m两塔三跨混凝土斜拉桥,该桥处于地震区,为了解地震作用对桥塔底面内力的影响,应用SAP2000软件建立有限元模型,采用非线性时程分析方法进行研究,并根据《公路桥梁抗震设计细则》对桥塔底面的承载能力进行了验算,结果表明:横向+竖向输入工况下的两塔塔底占主导作用弯矩大于纵向+竖向输入工况下的弯矩值,主桥桥塔底面的承载能力满足规范要求。

The main bridge of changde-yuanjiangxi bridge is a concrete cable-stayed bridge with double pylons,and the site of the bridge is in the earthquake area.In order to understand the influence of seismic action on the internal force of the bottom of pylons,the software SAP2000 was used to establish the finite element model for this bridge,and the nonlinear time-history analysis method were used.The bearing capacity of the bottom of pylons was checked according to the specification(JTG/T B02-01-2008 Guidelines for Seismic Design of Highway Bridges),and the results show that,the dominant moments of the bottom of pylons is larger when the lateral and vertical seismic action on the structure than the longitudinal and vertical seismic action on the structure,and The bearing capacity of the bottom of pylons meets the requirement of the code.