温度梯度模式对钢筋混凝土连续曲线箱梁桥变形的影响

Influence of Temperature Gradient to the Deformation of RC Continuous Curved Box Girder Bridge

结合实测温度荷载对某实桥进行了变形量的分析计算,同时比较了7种温度梯度模式对钢筋混凝土连续曲线箱梁桥变形的影响。针对浙江地区和与其气候条件相似地区提出了一种简便、且与实测结果相符的温度梯度模式。结果显示所建立的有限元模型可以分析温度荷载对钢筋混凝土连续曲线箱梁桥变形的影响。

Recently, in the operation of R. C continuous curved box-beam bridges, the beam body occurred the outward displacement along radial direction and took on obviously circumrotate and overturning tendency. The investigation shows that the main reason is temperature load. In allusion to the problem, based on certain temperature dates gained from the real bridges, the displacement of R. C continuous curved box-beam bridges arose by temperature load was calculated by finite element program. Seven Temperature gradient models of four countries were compared to analyze the influence to R. C continuous curved box-beam bridges. A simple temperature gradient was proposed that is suitable to Zhejiang and other areas that have similar climatic condition and conformed to temperature observation record of box girder profile. The result show that the finite element model made by ANSYS was suitable to analyze the deformation influence by temperature load to curved bridges. Test data for deformed research of this kind of bridges under the temperature load was provided in the paper.