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柱面网壳结构的竖向地震行波反应分析


第 28 卷第 6 期 2012 年 12 月 结 构 工 程 师 Structural Engineers Vol. 28 ,No. 6 Dec. 2012 柱面网壳结构的竖向地震行波反应分析 田仲业 摘 要 楼梦麟 * ( 同济大学土木工程防灾国家重点实验室, 上海 200092 ) 以某电厂干煤棚为例, 应用有限元方法, 分别计算了竖向一致激励与行波激励时大跨度柱面网 壳结构的地震反应, 然后根据计算结果比较了两种地震输入下结构动力反应的不同特点 。 数值分析表 明: 不同地震输入条件下的结构地震反应峰值存在较大的差异 , 基本上随输入地震的行波波速的减小呈 单调递减变化。进一步研究还表明: 当行波波速为某一特定值时, 结构的某些反应的变化与单调变化规 律并不完全一致, 存在行波共振的现象。 关键词 地震反应,行波共振,大跨度柱面网壳,一致输入,行波输入 Seismic Response Analysis of a Cylindrical Reticulated Shell Under Vertical Traveling Wave Excitations TIAN Zhongye LOU Menglin * ( State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092 ,P. R. China) Abstract Seismic responses of a long span cylindrical reticulated shell of a drycoalshed in a power plant under uniform vertical excitations and traveling wave excitations were analyzed using finite element method. The calculation results under the two seismic inputs were compared. The numerical analysis shows that there are big differences between the peak values of the structural seismic responses under different seismic excitations and basically,the values change monotonously with the traveling velocity. Further research shows that at a specific traveling velocity,some structural responses are not consistent with the monotonous change tendency and the phenomenon of traveling wave resonance exists. Keywords seismic response, traveling wave resonance, longspan cylindrical reticulated shell, uniform excitation,traveling wave excitation 1 引 言 2

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