水平位移荷载作用下桥台背墙的受力特性和参数分析  

Mechanical Characteristics and Parameter Analysis of Abutment Back Wall Under Horizontal Displacement Load

作　　者：李正阳 雷凡[2] LI Zhengyang;LEI Fan(School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430063,China;School of Ship Marine and Energy Power Engineering,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]武汉理工大学交通与物流工程学院,武汉430063 [2]武汉理工大学船海与能源动力工程学院,武汉430063

出　　处：《交通科技》2023年第2期85-89,共5页Transportation Science & Technology

摘　　要：为研究梁桥桥台背墙的受力特性,采用有限元软件ABAQUS建立典型简支梁桥桥台背墙的实体单元模型,通过在台背墙顶部逐级施加水平位移荷载,研究台背墙从弹性状态到屈服破坏的抗推力-变形效应,并通过分析比较加载位置与台背墙厚度2个参数研究台背墙的受力特性。结果表明,在顶部位移荷载下,台背墙根部会经历弹性阶段-混凝土开裂-钢筋屈服-结构破坏的典型受弯破坏过程;随着荷载作用位置的下移,桥台背墙的受力破坏模式逐渐由受弯破坏为主逐渐向受剪破坏为主转变,桥台背墙水平抗推能力显著增强,但整体抗变形能力有所减弱,延性也有所下降;台背墙的厚度对台背墙的力学性能有一定的影响,但不同厚度下桥台背墙的变形能力和延性差别不大,然而厚度较大的台背墙屈服荷载和峰值荷载均较大,表现出更好的力学性能。In order to study the mechanical characteristics of abutment back wall of beam bridge,an entity element model of abutment back wall of a typical simply supported beam bridge is established using finite element software ABAQUS.The thrust bearing capacity-deformation effect of abutment back wall from elastic state to yield failure is studied by applying horizontal displacement load step by step on the top of abutment back wall.The mechanical characteristics of the back wall are studied by analyzing and comparing the loading position and the abutment wall thickness.The results show that under the action of top displacement load,the bottom of the abutment back wall will experience the typical bending failure process which consists of elastic stage,concrete cracking,reinforcement yield and structural failure.With the downward movement of load,the stress failure mode of abutment back wall gradually changes from bending failure to shear failure,and the horizontal thrust bearing capacity of abutment back wall is significantly enhanced.However,the overall deformation capacity and ductility is reduced.The thickness of abutment back wall has a certain influence on the mechanical properties of abutment back wall,but the deformation capacity and ductility of abutment back wall vary little under different thickness.While,larger thickness will result in larger yield load and peak load of abutment back wall,showing better mechanical properties.

关 键 词：桥台 背墙 受力特性 数值模拟 

分 类 号：U441[建筑科学—桥梁与隧道工程] U443.21[交通运输工程—道路与铁道工程]