重力式U型斜交桥台的开裂与加固的非线性有限元模拟分析

The Finite Element Nonlinear Analysis of Cracking and Reinforcement for Gravity U-Shaped Skew Abutments

随着我国交通事业的迅猛发展,在桥梁建设中,大体积的重力式U型斜交桥台经常被采用,而很多桥台在施工中或投入使用后不久便出现开裂现象.经调查发现,裂缝大多出现在前墙与长侧墙交汇处附近,因此,探究造成桥台开裂的主要原因及采取何种加固改进措施,已经成为亟需解决的问题.笔者引入非线性有限元理论,土体按服从DP屈服准则的弹塑性材料处理,土体与混凝土之间采用接触分析,通过对各种尺寸的桥台进行的仿真模拟得出结论:台后土压力是导致桥台开裂的主要原因.然后,拟采用钢筋混凝土圈梁法对桥台进行加固,达到了很好的效果.

The gravity U - shaped skew abutments were often adopted in the construction of bridges, lots of abutments happened to crack during the usage stage or the course of construction, the paper cited finite element nonlinear theory, through the simulation of different sizes abutments, draw the conclusion that earth pressure was confirmed as the main reason of skew abutments cracking, reinforced concrete girder methods were simulated for the reinforcement, and got approving effect.