摘要
某体育场屋盖采用主次梁桁架形式,其平面投影是内侧为椭圆、外侧为正圆的开口环状。屋盖内环采用拉索悬挂,外环支撑于看台立柱上。主要分析屋盖自身的稳定性及竖向力作用下的静力弹塑性性能,判断各主要杆件的屈曲顺序及罕遇地震作用下塑性铰分布发展状态。分析结果表明,早期屈曲失稳及早期塑性铰分布均发生在屋盖内外环向次要构件上,这种主次桁架形式的屋盖不同于网架或网壳体系的屋盖,其自身的整体稳定性及抗震性能较好。
A stadium is roofed with a joist-and-girder space truss system, the plane projection of which is a ring with a circle-shaped outer and an ellipse-shaped inner. The inner ring of the roof is suspended by cables, while the Duter ring is supported by peripheral columns. In this paper, the eigenvalue buckling analysis and geometric nonlinear analysis were performed to investigate the sequence of buckling of main elements of the roof. Also the pushover analysis was used to predict the seismic behavior of the roof system. The results obtained by these analysis show that, quite different from the ordinary shell roofs, the stability and seismic behavior of the joist-and-girder space truss system is good.
出处
《结构工程师》
2009年第4期6-10,共5页
Structural Engineers
