考虑二阶效应串联隔震体系的塑性变形分析
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摘要
随着基础隔震技术研究的不断深入及其在我国汶川大地震中表现出的良好的减震效果,使得隔震技术在我国地震区灾后重建工程和邻近地区的新建工程中大面积开展应用。然而,实际的工程中,有关隔震结构体系仍有不少特殊的力学问题有待解决,特别是橡胶隔震支座与地下室悬臂柱组成的串联体系的塑性变形和稳定性问题,一直是工程界关注的焦点。针对这一问题,本文对不同轴力作用下串联体系塑性变形能力问题进行了研究。在考虑弯剪二阶效应下对串联隔震体系变形特性进行了理论推导,同时应用有限元分析软件ANSYS对给定的串联隔震体系在8种荷载工况下进行了模拟分析。结果表明,弯剪二阶效应对于串联隔震体系的内力影响是明显的,随着轴力的增加,串联隔震体系塑性变形能力下降。
With the development of the based isolation technology and its good performance during the Wenchuan earthquake,it is applied widely in the new building in the earthquake zones.However,there are some special mechanism problems on the serial isolation system in practical engineering are unsolved.Specially plastic deformation and stability of the serial isolation system,which is component of isolated rubber bearing and reinforced concrete column,are always focused by the engineer field.For this problem,the plastic deformation of the serial isolation system under the different axial force is studied.And deformation formulation of serial isolation system is derived considering the second effective of the bending and shear,meantime the given serial isolation system are analyzed by ANASYS finite element software under the 8 axial force cases.The results indicate that the second-order effect of the bending and shear is obvious for internal force of the serial isolation system and the plastic deformation reduces with the increasing of the axial force.
With the development of the based isolation technology and its good performance during the Wenchuan earthquake,it is applied widely in the new building in the earthquake zones.However,there are some special mechanism problems on the serial isolation system in practical engineering are unsolved.Specially plastic deformation and stability of the serial isolation system,which is component of isolated rubber bearing and reinforced concrete column,are always focused by the engineer field.For this problem,the plastic deformation of the serial isolation system under the different axial force is studied.And deformation formulation of serial isolation system is derived considering the second effective of the bending and shear,meantime the given serial isolation system are analyzed by ANASYS finite element software under the 8 axial force cases.The results indicate that the second-order effect of the bending and shear is obvious for internal force of the serial isolation system and the plastic deformation reduces with the increasing of the axial force.
引文
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[3]Stanton J F,Scroggins G,Taylor A W and Roeder CW.Stability of Laminated Elastomeric Bearings[J].J.Engrg.Mech.,ASCE,1990,116(6):1351～1371
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[9]杜永峰,李慧.叠层橡胶垫与RC柱串联隔震体系的随机屈曲分析[J].防灾减灾工程学报,2010,30,16～21Du Yong-feng,Li Hui.Study on Random Buckling ofthe Rubber Bearing Tandem Column System[J].Journal of Disaster Prevention and MitigationEngineering,2010,30:16～21(in Chinese)
[10]杜永峰,林治丹.双向水平地震作用下串联隔震体系的振动控制[J].工程抗震与加固改造,2010,32(4):32～37Du Yong-feng,Lin Zhi-dan.Vibration Control forSerially Connected Isolated Structures Subject to Two-directional Horizontal Earthquake[J].EarthquakeResistant Engineering and Retrofitting,2010,32(4):32～37
[11]杜永峰,杨静成,等.串联隔震体系静力性能有限元分析[J].工程抗震与加固改造,2010,32(4):26～31Du Yong-feng,Yang Jing-cheng.Finite-elementAnalyze Static Performance of Series Seismic IsolationSystem[J].Earthquake Resistant Engineering andRetrofitting,2010,32(4):26～31
[2]Koh C G and Kelly J M.“Effects of Axial Load onElastomeric Bearings”.UCB/EERC-86/12,EarthquakeEngineering Research Center,University of California,Berkeley,1986
[3]Stanton J F,Scroggins G,Taylor A W and Roeder CW.Stability of Laminated Elastomeric Bearings[J].J.Engrg.Mech.,ASCE,1990,116(6):1351～1371
[4]Masao Iizuka.A Macroscopic Model for PredictingLarge-deformation Behaviors of Laminated RubberBearing[J].Engineering Structures,2000,22:323～334
[5]日本建筑学会,刘文光译.隔震结构设计[M].北京:地震出版社,2006Architecture Institute of Japan(Liu Wen-guangtranslation).Isolated Structure Design[M].Beijing:Seismic Press,2006(in Chinese)
[6]周锡元,韩淼,等.叠层钢板橡胶垫的稳定性分析与强度验算[J].建筑科学,1997;(6):13～19Zhou Xi-yuan,Han Miao,et al.Stability Analysis andStrength Checking of Laminated Rubber Bearing[J].Building Science,1997,(6):13～19(in Chinese)
[7]周锡元,韩淼.橡胶支座与R/C柱串联隔震系统水平刚度系数[J].振动工程学报,1999,12(2):159～165Zhou Xi-yuan,Han Miao.Horizontal RigidityCoefficient of the Serial System of Rubber Bearing withColumn,Journal of Vibration Engineering,1999,12(2):159～165(in Chinese)
[8]李慧,姚云龙,杜永峰.叠层橡胶支座与柱串联体系动力失稳特性探讨[J].世界地震工程,2005,21(1):18～21Li Hui,Yao Yun-long,Du Yong-feng.Rubber BearingTandem Column System with the Characteristics ofDynamic Instability[J].World Earthquake Engineering,2005,21(1):18～23(in Chinese)
[9]杜永峰,李慧.叠层橡胶垫与RC柱串联隔震体系的随机屈曲分析[J].防灾减灾工程学报,2010,30,16～21Du Yong-feng,Li Hui.Study on Random Buckling ofthe Rubber Bearing Tandem Column System[J].Journal of Disaster Prevention and MitigationEngineering,2010,30:16～21(in Chinese)
[10]杜永峰,林治丹.双向水平地震作用下串联隔震体系的振动控制[J].工程抗震与加固改造,2010,32(4):32～37Du Yong-feng,Lin Zhi-dan.Vibration Control forSerially Connected Isolated Structures Subject to Two-directional Horizontal Earthquake[J].EarthquakeResistant Engineering and Retrofitting,2010,32(4):32～37
[11]杜永峰,杨静成,等.串联隔震体系静力性能有限元分析[J].工程抗震与加固改造,2010,32(4):26～31Du Yong-feng,Yang Jing-cheng.Finite-elementAnalyze Static Performance of Series Seismic IsolationSystem[J].Earthquake Resistant Engineering andRetrofitting,2010,32(4):26～31
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