罕遇地震作用下巨子型有控结构二阶效应影响分析
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摘要
通过有限元分析软件sap2000建立了巨子型有控结构(MSCSS)的有限元模型,在考虑二阶效应的情况下,对MSCSS进行了罕遇地震作用下的弹塑性时程分析,并与不考虑二阶效应的结构地震响应情况进行比较,研究了二阶效应对塑性铰的生成、结构侧移以及杆件内力的影响。研究结果表明:选择不同地震波激励时,考虑二阶效应的作用会使塑性铰数量分布有不同的变化规律;第二子结构层间侧移受二阶效应的不利影响随楼层增加而增加,最大增幅达到6.4%,同时,巨型柱的弯矩和第二子结构梁弯矩均受到二阶效应不利影响,其最大增幅分别为7.2%和7.4%。因此在对MSCSS进行罕遇地震下的弹塑性响应情况分析时,必须考虑二阶效应对结果的影响。
The finite element software SAP2000 was employed to establish the finite element model of Mega-Sub Controlled Structure System(MSCSS),and the elasto-plastic time history analysis considering the second-order effect of MSCSS under rare earthquake was carried out.The second-order effect on plastic hinge distribution,structural elasto-plastic story drift and structural internal force was analyzed by comparing with the structure without considering the second-order effect.The results show that:(1)the law of plastic hinge distribution considering the second-order effect is different when we choose different seismic wave excitation;(2)the second-order effect on story drift of second sub-structure is more and more adverse with the increase in floor and the most adverse effect is 6.4%;(3)the bending moment of mega column and second sub-structure beam is adversely affected by the second-order effect,the maximum increase in the amplitude of bending moment is 7.2% for mega column and 7.4% for sub-structure beam.Therefore,the second-order effect must be considered when the MSCSS elasto-plastic response under rare earthquake is analyzed.
The finite element software SAP2000 was employed to establish the finite element model of Mega-Sub Controlled Structure System(MSCSS),and the elasto-plastic time history analysis considering the second-order effect of MSCSS under rare earthquake was carried out.The second-order effect on plastic hinge distribution,structural elasto-plastic story drift and structural internal force was analyzed by comparing with the structure without considering the second-order effect.The results show that:(1)the law of plastic hinge distribution considering the second-order effect is different when we choose different seismic wave excitation;(2)the second-order effect on story drift of second sub-structure is more and more adverse with the increase in floor and the most adverse effect is 6.4%;(3)the bending moment of mega column and second sub-structure beam is adversely affected by the second-order effect,the maximum increase in the amplitude of bending moment is 7.2% for mega column and 7.4% for sub-structure beam.Therefore,the second-order effect must be considered when the MSCSS elasto-plastic response under rare earthquake is analyzed.
引文
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[5]刘锐,张洵安,刘觉先,王茜茜.采用摩擦阻尼器的MSCS在地震作用下的控制性能研究.西北工业大学学报,2010,28(3):436~437Liu Rui,Zhang Xun′an,Liu Juexian,Wang Qianqian.Earthquake Vibration Control of MSCS(Mega-Sub Controlled Structure)Which Employs Friction Dampers.Journal of Northwestern Polytechnical University,2010,28(3):436~437(in Chinese)
[6]陈麟,周云,张耀春.巨型钢框架结构性能分析及二阶效应的影响.钢结构,2004(2):13~16Chen Lin,Zhou Yun,Zhang Yaochun.Performance Analysis of Steel Megaframe and Influence of Second-Order Effects.SteelConstruction,2004(2):13~16(in Chinese)
[2]张洵安,周湘鄂,何官剑.一种新型结构体系在随机激励下的控制参数特性研究.西北工业大学学报,2007,25(2):306~310Zhang Xun′an,Zhou Xiang′e,He Guanjian.Characteristics of Control Parameters of a Particular PMSCSS Structural Configura-tion under Random Excitation.Journal of Northwestern Polytechnical University,2007,25(2):306~310(in Chinese)
[3]连业达,张洵安,王朝霞.巨、子结构质量比对新型有控建筑结构影响研究.振动与冲击,2007,26(8):112~115Lian Yeda,Zhang Xun′an,Wang Zhaoxia.Investigation in New Building Structure with Different Mass Ratio between Mega-Structure and Sub-Structure.Journal of Vibration and Shock,2007,26(8):112~115(in Chinese)
[4]蓝宗建,田玉基等.巨型框架多功能减振结构体系的减振机理及其减振效果分析.土木工程学报,2002,35(6):1~5Lan Zongjian,Tian Yuji,et al.The Mechanism and Efficiency of Multifunctional Vibration-Absorption for Megarframe Struc-tures.China Civil Engineering Journal,2002,35(6):1~5(in Chinese)
[5]刘锐,张洵安,刘觉先,王茜茜.采用摩擦阻尼器的MSCS在地震作用下的控制性能研究.西北工业大学学报,2010,28(3):436~437Liu Rui,Zhang Xun′an,Liu Juexian,Wang Qianqian.Earthquake Vibration Control of MSCS(Mega-Sub Controlled Structure)Which Employs Friction Dampers.Journal of Northwestern Polytechnical University,2010,28(3):436~437(in Chinese)
[6]陈麟,周云,张耀春.巨型钢框架结构性能分析及二阶效应的影响.钢结构,2004(2):13~16Chen Lin,Zhou Yun,Zhang Yaochun.Performance Analysis of Steel Megaframe and Influence of Second-Order Effects.SteelConstruction,2004(2):13~16(in Chinese)
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