交错桁架多层钢结构推倒分析方法研究
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摘要
随着基于性能的抗震设计思想的发展,推倒分析开始成为罕遇地震下多、高层结构抗震设计的有力工具。本文以交错桁架多层钢结构为例,采用推倒分析对其在E l Centro波作用下的地震反应进行研究,分别采用位移系数法和能力谱法确定结构目标位移,同时进行结构在相同地震动下的弹塑性时程分析。研究表明,推倒分析能准确地评价交错桁架多层钢结构的抗震性能,采用位移系数法和能力谱法确定的结构顶点侧移均与弹塑性时程分析吻合较好,对层间位移及塑性铰分布的预测,能力谱法比位移系数法更为准确。
With the development of performance-based seismic design method,pushover analysis began to be an effective tool for seismic design of high-rise buildings under severe earthquakes.In this paper,a multi-story staggered steel truss structure was taken as a case study.Pushover analysis was adopted for the study of its seismic behavior under El Centro earthquake record.Target displacement was determined with both displacement coefficient method and capacity spectrum method.Nonlinear time history analysis was conducted for comparison.It was shown that the seismic behaviour of multi-story staggered steel truss structures can be evaluated accurately by the pushover analysis method.The maximum lateral displacements determined with both displacement coefficient method and capacity spectrum method agree well with the nonlinear time history analysis.For interstory drift and plastic hinge distribution,capacity spectrum method achieves more accurate results than the displacement coefficient method.
With the development of performance-based seismic design method,pushover analysis began to be an effective tool for seismic design of high-rise buildings under severe earthquakes.In this paper,a multi-story staggered steel truss structure was taken as a case study.Pushover analysis was adopted for the study of its seismic behavior under El Centro earthquake record.Target displacement was determined with both displacement coefficient method and capacity spectrum method.Nonlinear time history analysis was conducted for comparison.It was shown that the seismic behaviour of multi-story staggered steel truss structures can be evaluated accurately by the pushover analysis method.The maximum lateral displacements determined with both displacement coefficient method and capacity spectrum method agree well with the nonlinear time history analysis.For interstory drift and plastic hinge distribution,capacity spectrum method achieves more accurate results than the displacement coefficient method.
引文
[1]Applied Technology Council(ATC).Seismic evaluation and retrofit of concrete buildings[R].Report No.ATC-40,Redwood City,Califor-nia,1996.
[2]Federal Emergency Management Agency(FEMA).NEHRP Guidelines for the seismic rehabilitation of buildings[R].FEMA-273/274,Wash-ington D.C.,1997.
[3]GB 50011-2001建筑抗震设计规范,[S].北京:中国建筑工业出版社,2002.
[4]魏巍,冯启民.几种push-over方法的比较[J].地震工程与工程振动,2002,22(4):66-73.
[5]Freeman S A,Nicoletti J P,Tyrell J V.Evaluations of existing buildings for seismic risk-Acase study of Puget Sound Naval Shipyard[C]∥Proceedings of the 1st U.S.National Conference on Earthquake Engineering.Bremerton,Washington,1975:113?122.
[6]秦家长,罗奇峰.应用ATC-40能力谱法评估结构目标位移[J].地震工程与工程振动,2006,26(6):64-70.
[7]黄飞.交错桁架结构体系的应用及抗震性能研究[D].天津:天津大学,2006.
[8]叶献国,种迅,李康宁,等.Pushover方法与循环往复加载分析的研究[J].合肥工业大学学报,2001,24(6):1019-1024.
[9]毛建猛,谢礼立,翟长海.模态pushover分析方法的研究和改进[J].地震工程与工程振动,2006,26(6):50-55.
[2]Federal Emergency Management Agency(FEMA).NEHRP Guidelines for the seismic rehabilitation of buildings[R].FEMA-273/274,Wash-ington D.C.,1997.
[3]GB 50011-2001建筑抗震设计规范,[S].北京:中国建筑工业出版社,2002.
[4]魏巍,冯启民.几种push-over方法的比较[J].地震工程与工程振动,2002,22(4):66-73.
[5]Freeman S A,Nicoletti J P,Tyrell J V.Evaluations of existing buildings for seismic risk-Acase study of Puget Sound Naval Shipyard[C]∥Proceedings of the 1st U.S.National Conference on Earthquake Engineering.Bremerton,Washington,1975:113?122.
[6]秦家长,罗奇峰.应用ATC-40能力谱法评估结构目标位移[J].地震工程与工程振动,2006,26(6):64-70.
[7]黄飞.交错桁架结构体系的应用及抗震性能研究[D].天津:天津大学,2006.
[8]叶献国,种迅,李康宁,等.Pushover方法与循环往复加载分析的研究[J].合肥工业大学学报,2001,24(6):1019-1024.
[9]毛建猛,谢礼立,翟长海.模态pushover分析方法的研究和改进[J].地震工程与工程振动,2006,26(6):50-55.
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