FRP-混凝土组合桥面结构热应力分析

THERMAL STRESS ANALYSIS OF HYBRID FRP-CONCRETE BRIDGE SUPERSTRUCTURE

采用我国现行桥梁规范中最不利的三种环境温差作用(两种均匀温度变化和一种梯度温度变化),利用有限元软件ABAQUS对一种FRP-混凝土组合桥面结构进行热应力分析,得到了该组合桥面结构在这三种温差作用下的变形特征和应力分布状况。有限元模拟结果表明,均匀温度变化效应大于梯度温度变化效应;温差作用对FRP-混凝土组合桥面结构非常不利,在以后FRP-混凝土组合桥面结构设计中需将此作用作为重要的荷载之一加以考虑。

Finite element method has been employed to study the structural performance of one kind of hybrid fiber reinforced polymer（FRP）-concrete bridge superstructure under thermal effects using commercial finite element analysis（FEA） software,ABAQUS.Three kinds of ambient temperature change are chosen in this paper,which are two kinds of uniform temperature change and one kind of gradient temperature change.This study describes the conditions of deformation and stress distribution for the hybrid FRP-concrete bridge superstructure under the three kinds of temperature change.FEA results indicate that the thermal response of the hybrid FRP-concrete bridge superstructure would be significant,and the thermal effects should be considered as one of the important effects in the structural design of hybrid FRP-concrete bridge superstructure.