大跨混凝土箱梁温度场分析

摘要

Taking a two-lane extra large bridge as sample, it is to analyze the real time thermal field and thermal effect on a long-span prestressed concrete box girder. The obtained data is compared with the simulation which is based on a balancing theory of temperature distributions and exchange in box girder exterior surfaces. The results show that the proposed method can emulate the actual boundary conditions precisely, it can satisfy the design analysis requirement of the practice engineering. Based on the emulation of the temperature field, with the ANSYS secondary development technology, FEM modules are developed to analyze the thermal field of the prestressed concrete box girder bridges. The present examples show that the developed modules are effective and useful.%针对困扰工程设计的混凝土箱梁温度分布及温度应力问题,以某双线特大桥为背景,基于箱梁表面热交换平衡理论的预应力箱梁温度场数值仿真和现场实测的对比分析,以此来得到较为准确的混凝土箱梁壁厚温差的梯度模式.通过对比分析结果表明,基于箱梁表面热交换平衡理论的温度场数值仿真能客观模拟实际边界条件,具有较高的计算精度,可以很好的满足实际工程的设计分析要求,进而以温度场数值仿真为基础,利用ANSYS二次开发技术,开发出了与ANSYS风格一致的针对预应力混凝土温度场的可视化汉化模块,实例计算表明,该可视化汉化模块能很好的应用于实际,能够提高工作效率.