高速铁路下承式钢桁结合梁桥在偏载作用下的受力特性分析

Mechanics behavior analysis for through steel-truss composite beam bridge on the high-speed railway under deflection loads

以京沪高速铁路64 m简支下承式钢桁结合梁桥为对象,采用作者曾经提出的空间板梁单元和常规板壳单元、空间梁单元和空间桁单元离散结构,对其在偏载荷载作用下的受力特性进行空间有限元分析,计算主桁、混凝土板和纵、横梁的应力和位移。结果表明:该桥在偏载荷载作用下符合强度刚度要求。

The mechanics property of a through steel-truss composite beam bridge on Beijing-Shanghai high-speed railway with simple supportion under deflection loads,whose span is 64 m,was studied with finite element methods.The structure was discreted with the space palte-beam composite elements which is proposed by author,general palte-shell elements,space beam elements and space truss elements.The stresses and displacements of the main trusses,concrete slabs,longitude beams and horizontal beams were calculated.The results show that this bridge under deflection loads satisfy the request of the strength and stiffness.