框架结构滞回耗能在结构层间分配的计算分析
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摘要
为了解多自由度体系的地震破坏机理,将基于能量的抗震设计方法运用到多自由度体系结构抗震设计中,对多自由度体系的滞回耗能沿结构层间分配的规律进行了分析,探讨了结构的滞回耗能在结构层间的分配规律及其影响因素.计算表明,滞回耗能在总输入能中的百分比受结构阻尼比的影响较大,当结构阻尼比ξ=0 .0 2时,EH/EI 一般在70 %～80 % ;当ξ=0 .0 5时,EH/EI 在5 0 %左右;当ξ=0 .1 0时,EH/EI 大致为3 0 % .滞回耗能在结构层间为下大上小的梯形分布规律,薄弱层易在底部形成
In order to understand MDOF damage mechanism and apply energy based seismic design method to MDOF systems, the laws of storey distribution of hysteretic energy for MDOF systems are analyzed. It has been found that the damping ratio has a significant influence on the ratio of E_H to E_I. When the damping ratio ξ is 0.02, the value of E_H/E_I is in the range of 70%～80%; ξ=0.05,E_H/E_I is about 50%; ξ=0.10,E_H/E_I is about 30%. The storey distribution of hysteretic energy is ladder-shaped pattern, namely, the hysteretic energy in the bottom is larger than that in the upper stories and the bottom stories are apt to be the weak stories. Calculation and analysis have made considerable headway.
In order to understand MDOF damage mechanism and apply energy based seismic design method to MDOF systems, the laws of storey distribution of hysteretic energy for MDOF systems are analyzed. It has been found that the damping ratio has a significant influence on the ratio of E_H to E_I. When the damping ratio ξ is 0.02, the value of E_H/E_I is in the range of 70%～80%; ξ=0.05,E_H/E_I is about 50%; ξ=0.10,E_H/E_I is about 30%. The storey distribution of hysteretic energy is ladder-shaped pattern, namely, the hysteretic energy in the bottom is larger than that in the upper stories and the bottom stories are apt to be the weak stories. Calculation and analysis have made considerable headway.
引文
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[4] 李菊芳.建筑结构基于能量的地震反应分析及设计方法[D].西安:西安建筑科技大学,2004.
[5] ZaharahT F,HallW J.Earthquake energy absorption inSDOF structures[J].J.Struct.Engrg,ASCE,1984,110(8):1757-1772.
[6] 胡庆昌.建筑结构抗震设计与研究[M].北京:中国建筑工业出版社,1999.
[2] 刘 波,肖明葵,赖 明.结构地震总输入能量的分配[J].重庆建筑大学学报,1996,18(2):100-109.
[3] TsaiK C andLiJW.DRAIN-2D+,A GeneralPurposeComputerProgram forStatic andDynamicAnalyses ofInelastic2D StructuresSupplemented with a graphicprocessor,VIEW2D[R].ReportNO.CEER/R8-03,CenterforEarthquakeEngineeringResearch,TaiwanUniversity,1994.
[4] 李菊芳.建筑结构基于能量的地震反应分析及设计方法[D].西安:西安建筑科技大学,2004.
[5] ZaharahT F,HallW J.Earthquake energy absorption inSDOF structures[J].J.Struct.Engrg,ASCE,1984,110(8):1757-1772.
[6] 胡庆昌.建筑结构抗震设计与研究[M].北京:中国建筑工业出版社,1999.
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