提出预应力态张弦桁架结构计算模型，采用有限元分析技术建立了拉索设计预应力计算公式，以哈尔滨国际体育会展中心屋盖张弦桁架结构型式为背景建立算例结构模型，研究了拱桁架上下弦杆截面积比对拉索设计预应力、结构特征杆件内力和结构变形的影响，以及张弦桁架结构矢跨比所产生的影响．文章的研究方法和成果可为今后此类大型张弦桁架结构的设计和施工提供借鉴和参考．%The analysis model for the beam string structure subjected to prestress is proposed. The formula for the cable design prestress is formulated by using finite element analysis techniques;. Referred to the beam string structure for Harbin International Conference-Exhibition and Sport Center, the example structure of this paper is designed. The effect of the ratio of section areas for top and bottom chord for arch truss, as well as the ratio of the rise and span for arch truss, on the cable design prestress and the internal force of beam string structure are analyzed, respectively. The proposed method and results of this paper can provide reference for design and con- struction of this kind of beam string structure.
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