가로거더공법을 이용한 장지간 H형강 강합성교량 개발

Abstract

In the composite steel bridge using H-beam for main girder, moments of inner spots occurr more highly than moments between spots. So, the magnitude of cross-section of H-beam is decided by moment of inner spots. Then, the limit span of the composite steel bridge using H-beam is about 20 meters. In this study, we propose the cross girder method for long-span H-rolled beam steel-concrete bridge. To verify effect of decreasing moment of inner spots according to construction sequence, we carry out structure analysis by using FEM and get the following conclusions.

First, the cross girder method was proposed to decrease moment of inner spots by structure analysis according to construction sequence. And bending moment of inner spot decreased to 21%, but bending moment of between spot increased to 7%. It means that if the cross girder method is applied with same cross-section, the longer span can be set up. So, we can construct more economical bridge. Also, it is verified that cross girder has sufficient load carrying capacity by cross girder analysis.