预应力混凝土连续箱梁桥温度裂缝分析

Analysis on Temperature Crack of PC Continuous Box Girder Bridges

预应力混凝土连续梁桥以其跨度大,截面受力性能好,施工方面快捷等原因,成为普遍采用的桥型之一。但是,这种桥型在其施工或营运阶段,会产生不同程度的温度裂缝。从温差形成的角度分析了预应力混凝土连续箱梁桥温度裂缝产生的原因,同时举例讨论了温度梯度模式的选取对就计算温度应力的影响。

The PC continuous box girder bridge is popular, because of its big span, good force performance of box section, conveaience and shortcut construction. However, this kind of bridges will generate cracks in different degrees in bridge construction or in service. The causes of generating cracks are analyzed in terms of temperature differences. At the same time, an example is taken to discuss the influence different temperature grads modes make on the calculation of temperature stress.