钢-混凝土组合梁桥温度场及温度效应研究

Research of Temperature Field and Its Effect of Steel-concrete Composite Girder Bridge

为研究钢-混凝土组合结构梁桥的温度场及温度效应,以一座钢-混凝土组合梁桥实际工程为研究对象,对其温度场进行了实测,并通过最小二乘法拟合得到沿截面竖向的最不利温度梯度模式,与我国现行规范中规定的温度梯度模式进行对比,最后通过建立实桥的有限元模型分析了两种温度梯度模式作用下的桥梁结构响应。研究结果表明:钢-混凝土组合结构混凝土桥面板与钢梁接触的局部范围内存在较大温差;由实测温度场拟合得到的温度梯度模式与我国现行规范规定的温度梯度模式形式上有所差别。

In order to study the temperature field and its effect of steel-concrete composite girder bridge, taking the actual project of a steel-concrete composite girder bridge as the research object, its temperature field is measured. The most disadvantageous temperature gradient mode along the vertical section of the steel- concrete composite girder is obtained by the least square fit （LSF） , and it is contrasted with the temperature gradient mode stipulated in the current specification of China. Finally, the bridge structural responses under the action of 2 kinds of temperature gradient modes are analysed by the established finite element model of the real bridge. The result shows that （ 1 ） a larger temperature drop can be found in local contact range between concrete deck and steel girder of steel-concrete composite structure; （2） there is a difference between the mode obtained from the measured temperature field and the temperature gradient mode stipulated in the current specification of China.