宽体板拱桥空间受力分析

Study of super-wide slab arch bridge by three deminsion body

当板拱桥的宽度与跨度接近,甚至其宽度大于跨度,这类板拱桥称为宽体板拱桥.这类桥梁现有的杆系结构设计理论存在问题.按《公路桥涵设计通用规范(JTG D60-2004)》,以实腹式宽体板拱桥为例,利用M IDAS/C ivil建立空间有限元分析模型,进行影响面计算,分析了应力最不利位置以及其值的加载计算,将计算结果与平面杆系有限元简化分析模型的计算结果进行比较.指出二者分析结果的相同的和不同的方面,为该类桥梁的设计、病害分析提供理论基础.

When the width is very cloee to or much greater than the span of slab arch bridge, it is called Super-wide Slab Arch Bridge. Its problems according to beam theory are presented and a space FEM model is established by MIDAS/Civil software. The influence surface and live load application are computed with MIDAS software according to 《road and bridge design general standard（JIG D60- 2004 ）》, and the computing result is compared with that of simplified model of FEM plane frame. Its conclusion maybe become the basis of design and disease anlysis of Super-wide Slab Arch Bridge.