结构地震响应计算模型的比较和分析_柳国环.pdf

第 26 卷第 2 期 Vol.26 No.2 工 程 力 学 2009 年 2 月 Feb. 2009 ENGINEERING MECHANICS 10 文章编号：1000-4750(2009)02-0010-06 结构地震响应计算模型的比较与分析 * 1 1 2 柳国环 ，李宏男 ，林 海 (1. 大连理工大学海岸和近海工程国家重点实验室，辽宁，大连 116024 ；2. 天津大学建筑工程学院，天津 300072) 摘 要：回顾并比较了地震动激励下计算结构响应的位移输入模型和一致加速度输入模型，详细地讨论了由于阻 尼项忽略不同导致两种输入模型的本质差别，分析了由此对计算结果产生的影响，并通过数值算例说明该影响不 容忽视，进而建议在比较地震动多点激励与一致激励下的结构反应时，一致激励应采用位移输入模型而不是一致 加速度输入模型，从而可避免由于两种模型本身阻尼项忽略不同对计算结果产生的影响。此外，指出了振型叠加 方法在严格理论上不适用于位移输入模型。 关键词：地震动；位移输入模型；一致加速度输入模型；阻尼；多点激励 中图分类号：TU311.3; TU352.1+ 1 文献标识码：A COMPARISION AND EVALUATION OF MODELS FOR STRUCTURAL SEISMIC RESPONSES ANALYSIS * 1 1 2 LIU Guo-huan , LI Hong-nan , LIN Hai (1. State Key Laboratorg of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China) (2. School of Civil Engineering, Tianjin University, Tianjin 300072, China) Abstract: Two types of models, displacement input model and uniform acceleration input model, for structural response calculation subjected to earthquake ground motions, are reviewed and discussed. It is found that the omitted damping terms in the two models are different, which may have significant influence on structural responses. It is recommended that displacement input model, rather than uniform acceleration input model, to be adopted in comparing seismic responses caused by consistent excitations with those caused by multi-support excitations, to avoid the influence of the difference in omitted d