柱面网壳结构的竖向地震行波反应分析
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摘要
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。
Seismic responses of a long span cylindrical reticulated shell of a dry-coal-shed 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.
Seismic responses of a long span cylindrical reticulated shell of a dry-coal-shed 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.
引文
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[2]Kato S,Shomura M.Dynamic response and collapseacceleration of single layer reticular domes underearthquake motions[C].Beijing:Proceeding of In-ternational IASS Conference,1996.
[3]楼梦麟,邸龙.地震行波激励下单层柱面网壳反应分析[J].结构工程师,2005,21(5):48-52.Lou Menglin,Di Long.Response Analysis of SingleLayer Cylindrical Reticulated Shell under SeismicWave-Passage Excitations[J].Structural Engineers,2005,21(5):48-52.(in Chinese)
[4]董贺勋,叶继红.多点输入下大跨空间网格结构的拟静力位移影响因素分析[J].东南大学学报,2005,35(4):574-579.Dong Hexun,Ye Jihong.Effects of some parameterson pseudo-static displacement of space lattice struc-tures under multiple support excitations[J].Journalof Southeast University,2005,35(4):574-579.(inChinese)
[5]邢佶慧,钱宏亮,范峰,等.单层柱面网壳结构常遇三维地震作用下的地震响应分析[J].建筑结构,2007,37(2):31-33.Xing Jihui,Qian Hongliang,Fan Feng,et al.Analy-sis on seismic response of single-layer latticed cylin-drical shells due to multi-encountered 3-dimensionearthquakes[J].Building Structure,2007,37(2):31-33.(in Chinese)
[6]邢佶慧,沈世钊.单层柱面网壳结构强震作用下抗震性能研究[J].中国安全科学学报,2004,14(11):8-14.Xing Jihui,Shen Shizhao.Study on anti-seismic per-formance of single-layer latticed cylindrical shell un-der severe earthquake[J].China Safety Science Jour-nal,2004,14(11):8-14.(in Chinese)
[7]谢礼立,翟长海.最不利设计地震动研究[J].地震学报,2003,6(3):11-15.Xie Lili,Zhai Changhai.Study on the severest realground motion for seismic design and analysis[J].Acta Seismologica Sinica,2003,6(3):11-15.(inChinese)
[8]楼梦麟,高珊.拱桥在竖向地震波输入下的行波共振现象[J].世界地震工程,2009,25(4):7-11.Lou Menglin,Gao Shan.The resonant effect of trave-ling wave for the arch bridge under vertical seismicexcitation[J].World Earthquake Engineering,2009,25(4):7-11.(in Chinese)
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