体外预应力桥钢索转向区力学性能仿真分析

结合某高速公路体外预应力试验桥的设计,利用桥梁分析专业软件MIDAS/Civil对该桥的转向块区域力学性能进行了空间仿真分析,研究了该关键区域的应力分布、受力特点以及传力路径;根据混凝土材料本构关系和屈服准则提出了利用应力差值分析屈服区域特性的研究手段.得出转向块结构竖向压应力主要分布在肋部的转向管道以上部分;竖向拉应力主要分布在转向肋与底板交界外缘处以及转向管道之间区域,建议加宽转向管道间距,以减小该区域的应力集中现象.根据仿真分析结果,对实际工程的设计和施工提出了一些切实可行的建议,研究结论可供类似工程参考.

Simulation Analysis of Mechanical Properties of Deviating Zone in Externally Prestressed Bridge

Based on the design of an externally prestressed trial bridge for a certain express highway,a spatial simulation was done using the special software MIDAS/Civil to analyze the mechanical properties in the deviating zones of the bridge,as well as the stress distribution,loading conditions and force transmission paths in the key zones.According to the constitutive relation and yielding criteria, the differential stress analysis is proposed as a manner for the yielding zones where there are potential hazards.A conclusion is thus drawn that the vertical compressive stress in a deviator is distributed mainly in the part above the rib of deviating pipe,while the vertical tensile stress is distributed mainly between the junction of deviator and base plate and the deviating pipes.It is suggested to widen the gaps between deviating pipes to reduce the stress concentration there.Some practical and feasible measures are suggested to take for engineering design and constructions.The results are expected to provide favorable reference for similar projects.