连续箱梁桥悬臂施工过程中温度梯度效应的空间分析

Spatial Analysis of Temperature Gradient Effect in Process of Cantilever Construction of Continuous Box Girder Bridge

介绍了4种国内外常用的温度梯度模式,结合张家港大桥悬臂施工过程,运用有限元分析程序AN-SYS对变截面预应力混凝土连续箱梁桥施工过程中的温度梯度效应进行空间受力分析,讨论了悬臂施工各阶段温度变化对控制截面位移的影响,得出了一些对连续箱梁桥施工控制有参考价值的结论。

Four kinds of temperature gradient modes having been commonly used at home and abroad are introduced. With reference to the cantilever construction of Zhangjiagang Bridge, the finite element analysis program ANSYS is used to conduct a spatial mechanical analysis of tem- perature gradient effect in the process of cantilever construction of prestressed concrete continuous box girder bridge with varying cross sections. The influences of temperature variations at different cantilever construction stages on the displacement of the controlled sections of the bridge are discussed and some conclusions of reference values for the construction control of the continuous box girder bridge have been generalized.