北京理工大学体育馆钢结构与混凝土支墩承载力分析

ANALYSIS OF THE STEEL STRUCTURE AND CONCRETE ABUTMENT OF GYMNASIUM IN BEIJING INSTITUTE OF TECHNOLOGY

北京理工大学体育文化综合馆钢结构屋盖采用了主桁架拱悬吊屋面桁架的结构形式,主拱是由钢管桁架组成的截面形式为平行四边形的圆弧拱,屋架采用由钢管组成的倒三角形曲线桁架。首先利用有限元法,分析钢屋盖在不同荷载组合工况下的内力和变形;其次对在结构中起重要作用的主桁架拱,进行弹性屈曲分析及弹塑性极限承载力分析,以评价主桁架拱承载力的安全储备;最后针对主拱混凝土支墩在施工中出现的裂缝问题,进行较为精确的数值分析,并讨论在不同荷载条件下的应力和裂缝分布。

The gymnasium in Beijing Institute of Technology is composed of reinforced concrete frame-shear walls and a steel roof which is made up of two robust truss-arches and ten curved spatial trusses. The main trussarches that support the steel roof are built from a number of parallelogram trusses while the curved spatial trusses are formed by the triangular section trusses. With the finite element analysis, the steel roof trusses have been analyzed in different load cases to check their strength. Linear elastic buckling load and ultimate load-carrying capacity of the main truss-arch have been obtained, and then its strength evaluation is given from the obtained results. The distribution of concrete stress and cracks at concrete abutments are analyzed under three different load cases, and some helpful suggestions are proposed finally.