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本文建立了组拼拱的一系列化模型,采用通用有限元软件MIDAS/Civil的屈曲分析功能,分析横撑刚度和横撑间距对组拼拱侧倾失稳的影响,分析表明横撑刚度对临界荷载成线性比例关系。横撑间距对临界荷载不成线性关系。当横撑间距大于某个值时,基本成线性比例。当横撑间距小于该值时,间距的影响很大,间距变小临界荷载迅速变大。本文的研究工作为该类拱桥的设计提供参考依据。
In this paper, a series of models of group arches are established. Using the general finite element software MIDAS/Civil’s buckling analysis function, the influence of cross bracing stiffness and cross brace pitch on the roll stability of the group arches is analyzed. The analysis shows that the cross brace stiffness is correct. The critical load is linearly proportional. The spacing of cross braces is not linear with the critical load. When the crossbar spacing is greater than a certain value, it is basically a linear scale. When the cross-brace spacing is smaller than this value, the influence of the pitch is large, and the smaller the pitch, the larger the critical load becomes. The research work in this paper provides a reference for the design of such arch bridges.