四坡双向异形弦支网架设计与分析*
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(1 天津大学建筑工程学院，天津 300072； 2 天津大学建筑设计研究院，天津 300073）
［摘要］随着大跨空间结构的发展，将张拉整体引入网架结构，形成了上部为刚性网架、下部为柔性预应力拉索、中间通过撑杆连接的弦支网架结构体系，这种结构受力合理，可减小结构挠度与支座水平反力，通过预应力拉索形成自平衡体系。结合天津市中心城区轨道交通综合控制中心钢屋盖四坡双向异形弦支网架结构，论述其设计方法，并对其进行静动力分析，考虑了支座刚度、索力调整以及张拉位置等因素的影响，并进行整体模型分析。通过结果分析，得到弦支网架设计时索力调整、支座刚度等对结构内力、变形与支座反力、位移的影响以及上部简化模型与整体模型的区别与联系，对同类工程实践具有指导意义。［关键词］弦支网架; 整体分析; 空间结构; 预应力; 正放四角锥; 张拉整体中图分类号：TU356, TV332.5 文献标识码：A 文章编号：1002-848X(2015)17-0044-05
Analysis and design on four-side slope and bidirectional cable supported space grid structureChen Zhihua1, Li Bo1, Yan Xiangyu2(1 School of Civil Engineering, Tianjin University, Tianjin 300072, China; 2 Architectural Design and Research Institute of Tianjin University, Tianjin 300073, China )Abstract: With the rapid development of large-span space structure, the concept of tensegrity system is introduced into space grid structure to form a cable supported space grid structure with rigid grids in upper part, flexible prestressed cables in lower part and connection of struts between above two parts. The structure has reasonable mechanical properties with self-balance system composed of prestressed cables, which can reduce structure deflection and support horizontal reaction. Combined with the four-side slope and bidirectional cable supported space grid structure steel roof of Tianjin Downtown Traffic Integrated Control Center, the design method was introduced, and the static and dynamic analyses were conducted considering support stiffness, cable force adjustment and tensioning position. The whole model with upper and below structures were built and analyzed. As the result, the influences of support stiffness and cable force adjustment on the structure internal force, deflection and support -reaction, displacement were obtained, and the difference and connection between the upper simplified model and the whole model were obtained, providing reference for similar engineering practice.Keywords: cable supported space grid structure; whole model analysis; space structure; prestress; orthogonal square pyramid; tensegrity
*国家自然科学基金创新研究群项目（51478310）。作者简介：陈志华,教授,博士, Email: zhchen@tju.edu.cn。
