复杂建筑结构竖向地震作用的振型分解反应谱分析
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摘要
通过对结构变形机理的分析指出:竖向地震作用下,一般的框剪、框筒等多、高层建筑结构中可能存在显著的竖向相对错动效应;大跨结构、长悬臂结构中则可能出现竖向二次共振;结构的竖向抗震设计中,应重视发生于墙-墙、墙-柱或柱-柱之间的竖向错动效应,对于大跨结构的设计,则应有意识地使设计方案避开二次共振。《建筑抗震设计规范》(GB50011—2001)规定的计算竖向地震作用的"底部轴力法"和"直接地震作用系数法"不能充分反映结构的竖向错动效应和二次共振效应,而振型分解反应谱方法则可以准确地计算这些效应。基于此,为了给复杂结构、大跨结构的竖向地震设计提供一个合理、有效的工具,在复杂多、高层有限元分析与设计软件PMSAP中,实现了竖向地震反应谱分析,并将其分析结果严格按照中国规范纳入了基本构件的设计。
Under vertical earthquake action,vertical shearing response may become prominent in most multi-storey or high-rise building structures,and the secondary resonance may be excited in large-span structures.In the vertical earthquake resistant design of building structures,the vertical shearing response occurring in shear wall to shear wall on shear wall to column or column to column should be attached importance to and the secondary resonance in large-span structures should be avoided purposely.The simplified method to calculate vertical earthquake response recommended in code is unable to calculate the secondary resonance and the vertical shearing response,but the modal analysis method by response spectrum can accurately calculate these effect.To provide a reasonable and effective tool for the vertical earthquake resistant design,the modal analysis method by response spectrum of vertical earthquake is implemented in the PMSAP program,which is a commercial computer software for seismic analysis and design of complicated multi-story or high-rise building structure.
Under vertical earthquake action,vertical shearing response may become prominent in most multi-storey or high-rise building structures,and the secondary resonance may be excited in large-span structures.In the vertical earthquake resistant design of building structures,the vertical shearing response occurring in shear wall to shear wall on shear wall to column or column to column should be attached importance to and the secondary resonance in large-span structures should be avoided purposely.The simplified method to calculate vertical earthquake response recommended in code is unable to calculate the secondary resonance and the vertical shearing response,but the modal analysis method by response spectrum can accurately calculate these effect.To provide a reasonable and effective tool for the vertical earthquake resistant design,the modal analysis method by response spectrum of vertical earthquake is implemented in the PMSAP program,which is a commercial computer software for seismic analysis and design of complicated multi-story or high-rise building structure.
引文
[1]GB 50011—2001建筑抗震设计规范[S].
[2]曲乃泗.高等结构动力学[M].大连:大连理工大学工程力学系,1991.
[2]曲乃泗.高等结构动力学[M].大连:大连理工大学工程力学系,1991.
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