陡坡双桩柱式桥墩位移的有限元分析

Finite Element Analysis of Displacement of Double Pile-Column Bridge Pier at Steep Slope

针对山区陡坡桥墩的复杂受力特点,根据某陡坡双桩柱式桥墩的工程实际情况,结合室内试验模型,利用ADINA有限元分析程序,分别采用顺桥水平荷载、竖向荷载、坡顶荷载和复杂荷载等不同加载方式对桩柱式桥墩进行数值分析.模拟结果表明:在顺桥水平荷载作用下或竖向荷载作用下,前后桩柱的墩顶位移不同,前桩墩的位移较后桩墩的大,且随着荷载的增加其差值也越来越大;在坡顶荷载作用下墩顶也产生竖向位移,前墩顶的竖向位移较后墩顶的大,但是随着坡顶荷载的增大其差值越来越小;在复杂荷载作用下前、后桩柱的墩顶位移较单一荷载下的相应值都要大.

Aiming at the complex loading characters of bridge pile at steep slope in mountains,according to a double pile-column bridge pier engineering at steep slope and test models in laboratory,finite element analyses of pile-column bridge pier were carried out under different loading,such as horizontal loading in the longitudinal direction of the bridge,vertical loading,slope top loading and complex loading,using software ADINA.The numerical simulation results show that displacements of front pile pier top and back pile pier top are different under horizontal loading in the longitudinal direction of the bridge or vertical loading,the displacements of front pile pier top are higher than those of back pile pier top respectively,and its difference is increased with the increase of loadings.Vertical displacements will also appear under slope top loading,and the displacements of front pier top are higher than those of back pier top respectively too,while its difference is reduced with the increase of loadings.Displacements of front pile pier top and back pile pier top under complex loading are larger than those under single loading.