环状折线桁架体育场挑篷结构的性能研究

根据大型体育场的特点和要求,提出一种新型体育场挑篷结构形式.该结构由相邻两榀桁架上下错动而成.分析其固有频率和温度内力分布,表明该结构整体刚度大,温度内力较小,可充分发挥材料的强度.对桁架的榀数、厚度及高差进行参数分析,计算比较用钢量、刚度,验证其具有较大的平面外刚度,并给出合理的设计参数.分析在地震作用下结构内力的分布,说明该结构具有良好的抗震性能.与国家体育场比较,证明该新型结构经济性好,是一种优良的结构形式.

Structural behavior of folded truss for annulus stadium cantilevered roof

According to the characteristics and requirements of large stadiums,a new structure form for annulus stadium cantilever roof is proposed.The new form is based on plate lattice truss structures,but the height of adjacent trusses is different.In order to investigate the properties of this new form,natural frequencies and distribution of temperature-related internal force are analyzed first.The results show that the new form is rigidity and the temperature-related internal force is small,which means material strength is more efficiently used.Then structures with different parameters are designed respectively and total steel consumptions and displacements are calculated,validating a larger stiffness out of plane,and a series of reasonable design parameters are presented.Distributions of seismic internal force are examined,indicating that the structure has a good seismic performance.Comparing with the National Stadium,the folded truss structure is a good structure form and is more economical.