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城市立交桥多股匝道交汇处的块体属异形结构(形同裤衩),应力状况复杂,是该种桥梁结构设计中受力状况难以把握的部位,运用常规的平面杆系有限元分析方法是很难得到正确结果的,需要采用空间分析方法进行求解,结合平面杆系结果进行分析。在此分析了某桥的“裤衩”异型块结构在配有预应力筋时,各工况下的受力特性。这里使用有限元软件建立了梁格模型和实体有限元模型。通过对比在自重工况下两种计算模型的分析结果,对结构的弯、扭效应进行了分析。
The block structure of multi-unit ramp interchanges in urban overpasses is of the same shape (same shape as the pants), and the stress conditions are complex. It is a part of the bridge structure design that is difficult to grasp the force condition. The conventional planar rod system finite element analysis method is very Difficult to get the correct result, you need to use the spatial analysis method to solve, combined with the results of planar rod system analysis. In this paper, the analysis of a bridge “pants ” shaped block structure with prestressed tendons, the stress characteristics under various conditions. Here, finite element software is used to establish the beam and solid finite element models. By comparing the results of two kinds of calculation models under the deadweight condition, the bending and twisting effects of the structure are analyzed.