钢桁架结构次应力问题的探讨

近年来钢桁架结构桥梁的建造逐渐增加,相比于其他类型桥梁,钢桁架结构具有跨度大、承载能力强、构造轻巧简洁的特点。但钢桁架结构桥梁设计中次应力的分析计算比较困难,特别是随着大跨度桥梁的建造,如何考虑次应力对桥梁结构设计的影响很重要。应用有限元软件,以广州新光大桥钢桁结构拱设计方案为例,探讨引起钢桁架结构中次应力的因素,同时根据次应力大小决定是否考虑其影响,并就减小钢桁架结构次应力给出了一些建议措施。

EXPLORATION OF SECONDARY STRESS IN STEEL TRUSS STRUCTURE

The constructing of steel truss bridges has been in creased gradually in recent years. As compared to other sorts of bridges, the st eel truss features large span, high bearing capacity, light and forthright struc ture. However it is more difficult to analyze the secondary stress in the design of a steel truss bridge. How to consider the effect of the secondary stress on the design of a bridge structure is very important with the constructing of larg e span bridges. The factors producing secondary stress in the steel truss are ex plored using FE software, taking the design scheme of steel truss arch for Guang zhou Xinguang Bridge for example. It is proposed that some recommendations for d ecreasing the secondary stress in the steel truss structure.