连续箱梁桥的温度梯度和汽车荷载效应研究分析

Research on Temperature Gradient and Automobile Load Effect of Continuous Box-girder Bridges

在比较分析双折线函数、指数函数和幂函数为代表的三种温度梯度模式的基础上,对一座七跨预应力混凝土连续箱梁桥的温度梯度和汽车活载所引起的结构弯矩、变形和应力效应进行研究,结果表明预应力混凝土箱梁的温度梯度效应与汽车荷载效应相当,应在其结构设计中加以重视,以提高预应力混凝土箱梁的抗裂性能。

Base on comparing the three different temperature gradient model of double nential function and power function, the temperature gradient and automobile loading broken line tunction, expoeffects including structural moment, deformation and stress of a seven span prestressed concrete continuous box-girder bridge have been analyzed in detail. The result shows that the temperature effects and automobile loading effects are equivalent. Therefore, it is necessary to emphasize the temperature gradient effects in the structure design in order to improve crack resistance ability of pre-stressed concrete continuous box-girder bridges.