变截面连续箱梁桥温度场及其效应的有限元分析

Finite element analysis for temperature field and its effect of cross-section continuous box girder bridge

为得到地区温度梯度函数,对一座在役连续箱梁桥进行了长期温度观测.基于热传学原理,对该箱梁的温度场进行了有限元分析,.将实测数据和有限元计算结果相结合,利用数理统计方法,对比分析获得了箱梁竖向温差拟合曲线,对拟合温度曲线下的桥梁纵向温度应力进行计算.研究结果表明:有限元计算结果与实测温度符合较好;计算箱梁竖向温差拟合梯度曲线,求得在该温度梯度下的桥梁纵向最大温度拉应力为1.8 MPa.

In order to obtain a function of the temperature gradient, the continuous long-time monitoring of temperature was conducted. Based on the principles of heat transfer, the temperature field of box girder was analyzed with finite element analysis. The results show that the calculation results by using the finite element analysis are consistent with measured value. Combined the measured data with the finite element calculation results, the fitting curve of the box girder vertical temperature was obtained by adapting the methods of mathematical statistics. Based on the temperature fitting curve, the bridge longitudinal temperature stresses was calculated. Calculating the fitting curve of the box girder vertical temperature, the results indicate that the maximum temperature of bridge longitudinal tensile stress reaches up to 1.8MPa