曲线连续箱梁温度梯度效应研究

Study on the Thermal Gradient Effect of the Continuous Curved Box-Girders

摘要: 参照中国公路桥规和铁路桥规对温度梯度的规定，利用热–结构耦合分析的方法对连续曲线梁桥温度效应进行分析。结果表明除径向应力外，依据公路桥规计算的温度效应值均小于铁路桥规计算值。同时对影响曲线箱梁温度效应的参数进行分析，依据公路桥规对不同曲率半径箱梁的温度梯度效应进行计算，结果表明温度梯度作用下曲率半径对箱梁竖向变形、纵向应力以及支座反力影响较为显著，且曲线箱梁受力不均匀程度随圆心角的增大线性增长。

Abstract: According to the railway bridge code and highway bridge code, the thermal-structural coupling method was adopted in the research of the thermal gradient effect of the continuous curved box- girders. The results showed that the thermal effect calculated according to the railway code is greater than that calculated according to the highway bridge code except the radial stress. Also the factor impacting on the thermal gradient effect was studied through the calculating of the curved box-girders with different radius according to the high bridge code. It is shown that the radius has a great influence on the vertical deformation, longitudinal stress and support reaction, and the degree of non-uniform bearing performance in curved box-girders is linear with the central angle./span>