空间三向张弦结构的结构性能和索杆系布置方式研究

Research on the Structural Performance and the Cable-strut Arrangement of Three Direction Spatial Beam String Structure

为掌握空间三向张弦结构体系的静力性能,以某实际工程钢屋盖为例,分析了多个承载力极限状态工况下的结构性能,得出空间三向张弦结构的结构整体性较好,半跨雪荷载不起控制作用,但该类结构同样受温度变化影响较大。在结构性能分析基础上,对三向张弦结构下部索杆系的撑杆布置方式进行了对比分析,得出张弦结构撑杆由少增多,会显著改变结构的受力性能,使结构上下部分更好的协同工作。但是撑杆太多,起不到太大的改善受力性能的作用,反而增加了施工复杂度和结构的自重。

In order to master the static behavior of three directions spatial beam string structure,the structure performance of an actual steel roof structure under ultimate limit state condition was analyzed.The results show that the spatial structure performs well structural integrity,the half-span snow load would not have the control effect,but the spatial structure was influenced greatly by temperature.The arrangement methods of cable-strut systems in substructure of the spatial structure was analyzed based on the above study,the results show that the mechanical behavior would significant change by increasing struts of the spatial structure,making the superstructure and substructure work together better,but it would also increase the complexity of construction and dead weight while increasing too many.