多自由度体系滞回耗能的影响因素分析
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摘要
多自由度体系的滞回耗能是基于能量抗震设计方法的重要指标。通过对三种场地的3条地震波记录为输入,以简化的双折线恢复力模型和三折线恢复力模型来研究不同峰值加速度、场地类别和频谱特性对多自由度体系的滞回耗能的影响。研究结果表明:不同的恢复力模型计算出的滞回耗能差异明显,随着地震动峰值加大,结构反应越剧烈,采用不同恢复力模型造成结构屈服状态不同,因此滞回耗能存在差异;从滞回耗能所占总输入能量比例来看,滞回耗能是起主导作用,是导致结构破坏和损伤的主要因素;滞回耗能所占总输入能的比例受恢复力模型﹑峰值加速度﹑场地类别和频谱特性影响较小。
The hysteresis energy of MDOF systems is an important index based on the seismic design method.Through three seismic waves recorded on three sites for the input,we simplify the bilinear and three line resiliency model to study the hysteresis energy effect of MDOF based on the peak value of acceleration,different type site classification and spectrum characteristics.The result indicates that the hysteresis energy based on the different resiliency model are significant differences,with the peak ground motion increasing,the structure has the violent reaction;As the structure yield state caused by different resiliency model is different,so the hysteresis energy consumption is different;From the ratio of the hysteresis energy in the total input energy,the hysteresis energy consumption plays the leading role,which is the main factors of structure destroy and injury;The hysteresis energy consumption proportion of total input is only under small influence of the resiliency model,peak acceleration,the different type site classification and spectrum characteristics.
The hysteresis energy of MDOF systems is an important index based on the seismic design method.Through three seismic waves recorded on three sites for the input,we simplify the bilinear and three line resiliency model to study the hysteresis energy effect of MDOF based on the peak value of acceleration,different type site classification and spectrum characteristics.The result indicates that the hysteresis energy based on the different resiliency model are significant differences,with the peak ground motion increasing,the structure has the violent reaction;As the structure yield state caused by different resiliency model is different,so the hysteresis energy consumption is different;From the ratio of the hysteresis energy in the total input energy,the hysteresis energy consumption plays the leading role,which is the main factors of structure destroy and injury;The hysteresis energy consumption proportion of total input is only under small influence of the resiliency model,peak acceleration,the different type site classification and spectrum characteristics.
引文
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[5]陆新征,叶列平,谬志伟,等.建筑抗震弹塑性分析[M].北京:中国建筑工业出版社,2009:29-30.
[6]钱枷茹,方鄂华,马镇炎.剪切刚度层模型恢复力特性骨架线的简化计算法[J].工业建筑,1996,26(1):22-27.
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