支撑体系对大跨空间结构受力性能的影响

THE EFFECTS OF BRACING SYSTEM ON THE MECHANICAL PROPERTIES OF LONG-SPAN SPATIAL STRUCTURE

空间结构设计过程中易忽视支撑体系对整体结构受力性能影响的分析,通过对两种常见结构体系及实际工程分析,总结支撑体系对不同结构形式的影响规律。对于平面空间结构体系,若各榀桁架跨度及受力情况不同,支撑体系会协调各榀桁架的变形,改变单榀桁架内力分布;对于曲面空间结构体系,支撑体系可能会改变结构的传力路径,纵向支撑可能会在曲面内产生壳体内力,改变结构内力分布。因此,应对带有支撑体系的整体结构进行分析。

The effects of bracing system on the mechanical properties of the whole structure are often overlooked in the process of spatial structure design. Through the analysis of two common structure systems and one actual project,the effects of bracing systems on different structural forms were summarized in this paper. For planar spatial structure,the bracing system should coordinate the deformation of trusses and change the internal force distribution of the trusses if the trusses had different spans or forces. For cambered spatial structure,the bracing system might change the force transferring route of the structure,and the longitudinal bracing might make the structure to generate internal force of shell structure,which could change the internal force distribution of the structure. As a result,the whole structure with bracing system should be analyzed.