高层钢结构基于均匀损伤设计的整体抗震能力提高方法
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摘要
本文主要研究如何通过合理设计来提高高层钢结构的整体抗震能力。首先,给出了高层钢结构的非线性计算模型;其次,建立了高层钢结构在强地震动作用下的倒塌失效模式的极限状态判别准则;然后,通过模态pushover分析,研究了高层钢结构在水平地震作用下的损伤规律;最后,重点研究了高层钢结构的整体抗震能力的提高方法,提出了均匀损伤的设计方法,该方法通过消除结构的薄弱层,来达到提高高层钢结构的整体抗震能力的目的。通过对两栋20层的高层钢框架结构进行极限时程分析和极限pushover分析,验证了文中提出的均匀损伤的设计方法的可行性。本文的工作可为高层钢结构的抗地震倒塌设计提供参考依据。
The paper mainly study how to increase the integral seismic capacity of the tall steel buildings by reasonable design.Firstly,the structural nonlinear calculation model is given.Secondly,the criterion of collapse failure modes of tall steel buildings under strong earthquake motion is established.Thirdly,by modal pushover analysis,damage law of tall steel buildings under horizongtal earthquake action is studied.Finally,the method for increasing the integral seismic capacity of tall steel buildings is studied mainly.The uniform-damage design method is proposed to increase the integral seismic capacity of tall steel buildings by eliminating the structural weakest stories.Two 20-story steel frame structures are designed on the basis of conventional philosophy and the uniform damage design method are used for limit state time history analysis and limit state pushover analysis to verify the proposed method in the paper.The results demonstrate that the uniform-damage design method is effective for increasing the integral seismic capacity.The research in the paper will give a reference to the design for preventing the seismic collapse of tall steel buildings.
The paper mainly study how to increase the integral seismic capacity of the tall steel buildings by reasonable design.Firstly,the structural nonlinear calculation model is given.Secondly,the criterion of collapse failure modes of tall steel buildings under strong earthquake motion is established.Thirdly,by modal pushover analysis,damage law of tall steel buildings under horizongtal earthquake action is studied.Finally,the method for increasing the integral seismic capacity of tall steel buildings is studied mainly.The uniform-damage design method is proposed to increase the integral seismic capacity of tall steel buildings by eliminating the structural weakest stories.Two 20-story steel frame structures are designed on the basis of conventional philosophy and the uniform damage design method are used for limit state time history analysis and limit state pushover analysis to verify the proposed method in the paper.The results demonstrate that the uniform-damage design method is effective for increasing the integral seismic capacity.The research in the paper will give a reference to the design for preventing the seismic collapse of tall steel buildings.
引文
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[12]尹超,周颖,吕西林.上海国际中心超限高层结构抗震分析[J].结构工程师,2008,24(6):80-84.YIN Chao,ZHOU Ying,LU Xilin.Seismic performance evaluation of Shanghai international design center:an out-of-codes high-rise building[J].Structural Engineers,2008,24(6):80-84.(in Chinese)
[2]赵俊贤,吴斌.防屈曲支撑的工作机理及稳定性设计方法[J].地震工程与工程振动,2009,29(3):131-139.ZHAO Junxian,WU Bin.Working mechanism and stability design methods of buckling-restrained braces[J].Journal of Earthquake Engineeringand Engineering Vibration,2009,29(3):131-139.(in Chinese)
[3]Aydin E,Boduroglu MH.Optimal placement of steel diagonal braces for upgrading the seismic capacity of existing structures and its comparisonwith optimal dampers[J].Journal of Constructional Steel Research,2008,64:72-86.
[4]Di Sarno L,Elnashai A S.Bracing systems for seismic retrofitting of steel frames[J].Journal of Constructional Steel Research,2009,65:452-465.
[5]Vamvatsikos D,Cornell C A.Direct estimation of seismic demand and capacity of multidegree-of-freedom systems through incremental dynamic a-nalysis of single degree of freedom approximation[J].Journal of Structural Engineering,2005,131(4):589-599.
[6]Asgarian B,Sadrinezhad A,Alanjari P.Seismic performance evaluation of steel moment resisting frames through incremental dynamic analysis[J].Journal of Constructional Steel Research,2010,66:178-190.
[7]American Society of Civil Engineers.Prestandard and commentary for the seismic rehabilitation of buildings FEMA356[S].Washington D.C.:Federal Emergency Management Agency,2000.
[8]郁彦.高层建筑结构概念设计[M].北京:中国建筑工业出版社,2005:4-6.YU Yan.Structural Concept Design for Tall Building[M].Beijing:China Building Industry Press,2005:4-6.(in Chinese)
[9]孙爱伏.高层钢结构的失效模式控制和汶川地震中房屋建筑的失效模式分析[D].大连:大连理工大学,2010.SUN Aifu.Failure mode control of tall steel buildings and failure mode anailsis of the house bulidings during Wenchuan earthquake[D].Dalian:Dalian University of Technology,2010.(in Chinese)
[10]GB50011-2001建筑抗震设计规范[S].GB50011-2001 Code for Seismic Design of Buildings[S].(in Chinese)
[11]钱稼茹,纪晓东,范重,等.国家体育场大跨度钢结构罕遇地震性能分析[J].建筑结构学报,2007,28(2):17-25.QIAN Jiaru,JI Xiaodong,FAN Zhong,et al.Seismic behavior analysis of large-span steel structure of the National Stadium under severe earth-quake[J].Journal of Building Structures,2007,28(2):17-25.(in Chinese)
[12]尹超,周颖,吕西林.上海国际中心超限高层结构抗震分析[J].结构工程师,2008,24(6):80-84.YIN Chao,ZHOU Ying,LU Xilin.Seismic performance evaluation of Shanghai international design center:an out-of-codes high-rise building[J].Structural Engineers,2008,24(6):80-84.(in Chinese)
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