大跨体育场罩棚结构抗震设计

Seismic design of long-span stadium awning

本工程体育场钢罩棚属于跨度超限的敞开式空间结构,本文基于钢罩棚结构和混凝土看台整体响应概念,使用有限元方法,进行了钢罩棚主要尺寸方案优选,静态条件下的结构变形分析,依据小震和中震条件下的谱分析结果,进行了抗震组合下的应力比包络分析,然后在考虑几何非线性,材料非线性条件下,进行了罕遇地震下的弹塑性时程分析,最后对柱脚节点进行了最不利组合下的应力变形分析。表明该罩棚设计完全满足基于性能要求的"小震弹性、中震可修、大震不倒"的要求。

The span of the opening steel awning above stadium in this project exceed limit. Based on the concept of ＇ overall response of the structure including of steel awning concrete bleachers and by finite element method, the paper carries out the optimization of the main dimensions of awning static mechanics analysis. According to the results from spectral analysis under little earthquakes and middle earthquake, a stress ratio envelopment analysis is carried out within seismic combinations, then, with geometric nonlinearity and material nonlinearity considered, a timehistory analysis about the mechanics performance under great earthquake is performed, and finally the stress and deformation of foot node under the most unfavorable combination is computed and evaluated. All the foregoing analysis shows that the design fully meets requirements of relevant performance.