首层架空多层框架结构抗地震倒塌简化验算
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摘要
探讨了把首层架空框架结构简化为单质点模型的条件,对工程中常见的首层架空多层钢筋混凝土框架结构的简化条件进行了分析,指出当结构高宽比较小时,可简化成一个单层框架模型。根据单层框架模型,利用结构延性需求、等效阻尼比、地震加速度反应谱得到架空层的层间需求曲线(V-u曲线),作为架空层抗地震倒塌设计的依据。通过结构在罕遇地震下的倒塌率计算,验证了文中方法的可靠性。
The equivalent conditions of frame structure with first floor open and infilled walls model simplified to single particle model were discussed.With the consideration of infilled walls,in common scale in engineering,simplified conditions of multi-story and multi-span reinforced concrete frame with open floor were collected and generalized.For checking collapse resistant,the frame can be simplified to the single floor frame model when the height-width ratio of the structure is small.The inter-story demand curve of open floor(V-u curve),as the design basis of open floor collapse resistant,was obtained through the structure ductility demand,the equivalent damping ratio and the earthquake acceleration response spectrum.The reliability of the method was checked by calculating the collapse rate of the structure under rare earthquake.
The equivalent conditions of frame structure with first floor open and infilled walls model simplified to single particle model were discussed.With the consideration of infilled walls,in common scale in engineering,simplified conditions of multi-story and multi-span reinforced concrete frame with open floor were collected and generalized.For checking collapse resistant,the frame can be simplified to the single floor frame model when the height-width ratio of the structure is small.The inter-story demand curve of open floor(V-u curve),as the design basis of open floor collapse resistant,was obtained through the structure ductility demand,the equivalent damping ratio and the earthquake acceleration response spectrum.The reliability of the method was checked by calculating the collapse rate of the structure under rare earthquake.
引文
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[2]林旭川,潘鹏,叶列平,等.汶川地震中典型RC框架的震害与仿真分析[J].土木工程学报,2009,42(5):14-20.
[3]曹万林,王光远,吴建有,等.轻质填充墙异型柱框架结构层刚度及其衰减过程的研究[J].建筑结构学报,1995,16(5):20-31.
[4]门进杰,史庆轩,周琦.竖向不规则钢筋混凝土框架结构基于性能的抗震设计方法[J].土木工程学报,2008,41(9):68-75.
[5]门进杰.不规则钢筋混凝土框架结构基于性能的抗震设计理论和方法[D].西安:西安建筑科技大学,2007.
[6]GULKAN P,SOZEN M.Inelastic response of reinforcedconcrete structures to earthquakes motions[J].ACIJournal,1974,71:604-610.
[7]施伟,叶列平,陆新征,等.不同抗震设防RC框架结构抗倒塌能力研究[C]//北京:第十二届高层建筑抗震技术交流会,2009:46-57.
[8]MADAN A,REINHORN A M,MANDER J,et al.Modeling of masonry infill panels for structural analysis[J].ASCE/Journal of Structural Engineering,1997,123(10):1295-1302.
[9]Applied Technology Council,Federal EmergencyManagement Agency.Quantification of building seismicperformance factors[R].America,FEMA,2008.
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