钢管初始应力对大跨径钢管混凝土拱桥稳定承载力的影响

Influence of Initial Stress on Concrete-filled Steel Tubular Arch Bridge Stability and Bearing Capacity

在钢管混凝土拱桥施工过程中,采用不同施工方法合拢成拱,然后再向管内灌注混凝土,钢管中就产生了较大的初始应力.利用初始应力钢管混凝土的本构关系,分析钢管混凝土拱桥稳定承载力影响程度.计算结果表明,钢管初始应力的存在降低了钢管混凝土拱桥稳定承载能力,且不同的荷载工况影响程度不同.分析大跨度钢管混凝土拱桥稳定承载力时,应考虑钢管初始应力问题.

In construction of concrete-filled steel tubular arch bridges,engineers adopt different methods of construction to join the two sections of arch bridge and pour the concrete into steel tubes.A great deal of initial stress exists in steel tubes.we use constitutive relation of existing initial stress concreted-filled steel tubular to analyze the influence of initial stress on concrete-filled steel tubular arch bridges.The results show initial stress reduces stability and bearing capacity of concrete-filled steel tubular arch bridge.The influence of initial stress varied in different load conditions,and it can not be ignored.