城市小箱梁桥竖向温度梯度研究

Research on Vertical Temperature Gradient of Urban Small Box Girder Bridge

温度梯度荷载是城市桥梁设计中必须考虑的一种重要荷载。文章运用现代传热学仿真软件TAITherm对武汉市某混凝土小箱梁桥的温度场进行了时程分析,数值仿真计算结果与实测值吻合良好。计算和实测结果表明,我国现行桥梁设计规范规定的温度梯度模式在顶板是偏于安全的,而在底板上是偏于不安全的,应引起设计人员的注意。

Temperature gradient load is an important load that must be considered in the design of urban bridges.In this paper,a temperature field by time history of a small concrete box girder bridge in Wuhan is analyzed using modern heat transfer simulation software TAItherm.The numerical simulation results are in good agreement with the measured values.The calculated and measured results show that the temperature gradient mode specified in the current bridge design code in China is safe on the top plate and unsafe on the bottom plate,which should be noticed by designers.