混凝土箱梁温度作用效应的时程分析

Time-history Analysis of Temperature Action and Temperature Effects in Concrete Box Girder

提出了混凝土箱梁结构非稳态温度场计算及温度效应的时程分析方法,编制了有限元程序,得到了箱梁内温度场、跨中挠度、轴向变形和应变等随时间的变化结果。通过将计算结果与某混凝土箱梁试验实测结果比较,证明了这一分析方法的可行性和电算程序的可靠性。由此得到的温度效应时程分析结果可直接与其他荷载效应组合,使得有关温度作用的结构设计符合工程结构可靠度设计统一标准的要求。

The method for the calculation of non - steady temperature field and for time - history analysis of temperature effects in concrete box girder was put forward. The finite element analysis program was developed to analyze the variation of temperature field, mid - span deflection, axial deformation and strain of the box girder. In addition, the comparison between analytical results and experimental results showed that this finite element analysis method is effective and the calculated results of the program are reliable. The result based on the time - history analysis results of temperature effects could be combined with other load effects directly, which make the structural design on temperature action meet the requirements of unified standard for reliability design of engineering structures.