地震作用下考虑桥台-土相互作用的多跨简支板梁桥碰撞效应研究  

Study on Collision Effect of Multi-span Simply Supported Plate Girder Bridge Considering Abutment-soil Interaction under Earthquake

作　　者：邓育林[1] 魏征 葛雄 DENG Yulin;WEI Zheng;GE Xiong(School of Transportation,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]武汉理工大学交通学院,武汉430063

出　　处：《武汉理工大学学报（交通科学与工程版）》2021年第3期540-545,共6页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金项目(51678459);湖北省交通运输厅科技项目(018-422-1-2);湖北省技术创新专项重大项目(2018AAA031)。

摘　　要：针对典型的三跨简支板梁桥,基于台背墙-土、桩基-土动力相互作用模型以及Kelvin碰撞模型,利用OpenSees有限元软件建立了考虑桥台-土相互作用的多跨简支板梁桥碰撞模型,采用非线性时程法研究了碰撞对台背墙地震力、台后填土变形,以及桥台桩基地震响应的影响.结果表明:地震作用下梁体与台背墙的碰撞作用使得台背墙顶部纵向变形,底部弯矩、剪力,以及台后填土塑性变形明显增大,易引起台背墙损坏及台后填土失效;且撞击力还可传递给桥台基础,使得桥台桩基地震弯矩和剪力显著增大,引起桥台桩基破坏.According to the typical three-span simply supported plate girder bridge,based on the abutment wall-soil,pile foundation-soil dynamic interaction model and Kelvin collision model,a multi-span simply supported plate girder bridge collision model considering abutment-soil interaction was established by using OpenSees finite element software.The nonlinear time history method was used to study the impact on the seismic force of abutment back wall,the deformation of filling behind abutment and the seismic response of abutment pile foundation.The results show that the collision between the beam and the abutment back wall under earthquake causes the longitudinal deformation at the top of the abutment back wall,while the bending moment and shear force at the bottom and the plastic deformation of the filling behind the abutment increase obviously,which easily causes the damage of the abutment back wall and the failure of the filling behind the abutment.Moreover,the impact force can also be transmitted to the abutment foundation,which makes the seismic bending moment and shear force of the abutment pile foundation significantly increase and causes the abutment pile foundation to be damaged.

关 键 词：地震 桥台-土相互作用 简支板梁桥 碰撞 地震响应 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]