(浙江大学空间结构研究中心 杭州 310027)
【提要】 在大跨度干煤棚工程设计中采用的弦弓式预应力柱面网壳结构是由网壳和预应力拉索组成的杂交体系。采用非线性有限元方法研究了这种结构的稳定性，分析了各种荷载工况、初始缺陷和拉索预应力对结构稳定性的影响。分析了预应力对结构自振特性的影响，然后采用振型分解反应谱法对结构的水平及竖向地震反应进行了研究，总结了结构地震内力系数分布规律。研究表明，布置拉索对结构的稳定性能改善明显，结构的极限荷载提高30％以上，施加的预应力对结构的动力性能影响不大。
【关键词】 预应力网壳 稳定性分析 动力特性 抗震性能
Analysis of Stability and Dynamic Characteristic of Stringbow Prestressed Cylindrical Latticed Shell/Luo Yaozhi,Sun Xuguang(Research Center of Spatial Structure,Zhejiang University,Hangzhou 310027,China)
Abstract:The stringbow prestressed cylindrical latticed shell,which is a hybrid structure composing of cable and latticed shell, has been used to design longspan coal storage.The stability of structure is studied by nonlinear finite element method,and the effects of load case, initial defect, prestress on stability are also discussed.Meanwhile, the natural vibration characteristics and effects of prestress of structure are studied.Then,the vertical and horizontal seismic responses are studied by response spectrum method,and the distribution of seismic force coefficient is summarized.The results show that the cable improves the stability obviously,but it does not work to the dynamic characteristic basically.
Keywords:prestressed latticed shell;stability analysis;dynamic characteristic;seismic response
*国家自然科学基金项目50378083。