型钢混凝土框架桥受力特性的分析

Analysis on the Characteristics of Steel Reinforced Frame Bridge

目前框架桥结构主要是普通的钢筋混凝土框架结构,这种框架结构主要存在自重过大的问题,此问题导致顶进施工过程中土体的破坏和材料的浪费以及顶进施工难度的增加.本文提出用型钢混凝土结构代替框架桥中的普通钢筋混凝土结构,并用有限元软件Midas Civil对普通的钢筋混凝土框架桥和不同含钢率型钢混凝土框架桥进行了有限元的对比分析,对比两者在同等地质和荷载的条件下,所受内力和位移的情况,通过对比分析发现型钢混凝土框架桥结构是可行的,并得出了型钢混凝土框架桥含钢率的合理范围为5%～6%.

The current frame bridge structure is mainly ordinary reinforced concrete frame structure,which has the problem of too heavy self-weight.It,therefore,leads to the destruction of soil,the waste of materials and the increase of difficulty in jacking construction.In this paper,a new type of steel reinforced concrete structure is put forward to replace the ordinary reinforced concrete structure in frame bridge,using a finite element software Midas Civil to make a comparative analysis between the ordinary reinforced concrete frame bridge and the concrete frame bridges with different steel ratio inorder to know the internal force and displacement of the both under the condition of the same geology and load.It is found that the structure of steel reinforced concrete frame bridge is feasible and the rational steel ratio of the steel reinforced concrete frame bridge is within the range of 5%～6%.