偏心结构基于位移的抗震设计研究
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摘要
以往基于位移抗震设计方法多以平面分析为前提,不考虑平面外的影响,而这与实际中结构在地震下反应的多维性存在较大差异,尤其对于平面复杂的偏心结构。针对此问题,给出了偏心结构基于位移的抗震验算及调整设计方法。将偏心结构在地震作用下最薄弱的位置作为控制点,以该点在各地震设防水准下的限制位移为目标进行结构验算及调整设计。通过算例说明了该方法的使用程序,并初步证明该方法具有一定的准确性。
The classic displacement-based seismic design usually depends on planar analysis without reference to extra-planar effects.That is rather different from the real-world multidimensional response of structures in an earthquake,especially for asymmetric structures with complex planes.To address that problem,a displacement-based seismic check and redesign method for asymmetric structures is presented.Structural checking and redesigning are performed with the weakest part of the asymmetric structure under the action of an earthquake as the control point,whose limited displacement at each earthquake resistance level is targeted.An example calculation shows the procedures of this method;it also proves that the method comes with considerable accuracy.
The classic displacement-based seismic design usually depends on planar analysis without reference to extra-planar effects.That is rather different from the real-world multidimensional response of structures in an earthquake,especially for asymmetric structures with complex planes.To address that problem,a displacement-based seismic check and redesign method for asymmetric structures is presented.Structural checking and redesigning are performed with the weakest part of the asymmetric structure under the action of an earthquake as the control point,whose limited displacement at each earthquake resistance level is targeted.An example calculation shows the procedures of this method;it also proves that the method comes with considerable accuracy.
引文
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[4]GOEL R K,CHOPRA A K.Improved direct displace-ment-based design procedure for performance-basedseismic design of structures[DB].ASCE,2004.
[5]GARC姫A J R,MIRANDA E.Evaluation of residual driftdemands in regular multi-storey frames for performance-based seismic assessment[J].Earthquake Engineer-ing and Structural Dynamics,2006,35(13):1609-1629.
[6]王耀伟.平面不规则结构非弹性地震反应规律研究[D].重庆:重庆大学,2003.
[7]卢文峰,贾益纲.不规则多高层建筑抗震性能分析[J].江西科学,2007,25(1):10-13.
[8]TJHIN T,ASCHHEIM.Estimates of peak roof displace-ment using equivalent single degree of freedom systems[J].Journal of Structural engineering,2005,131:517-522.
[9]中华人民共和国建设部.GB50011-2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[2]钱稼茹,罗文斌.建筑结构基于位移的抗震设计[J].建筑结构,2001,31(4):3-4.
[3]罗文斌,钱稼茹.钢筋混凝土框架基于位移的抗震设计[J].土木工程学报,2003,36(5):22-29.
[4]GOEL R K,CHOPRA A K.Improved direct displace-ment-based design procedure for performance-basedseismic design of structures[DB].ASCE,2004.
[5]GARC姫A J R,MIRANDA E.Evaluation of residual driftdemands in regular multi-storey frames for performance-based seismic assessment[J].Earthquake Engineer-ing and Structural Dynamics,2006,35(13):1609-1629.
[6]王耀伟.平面不规则结构非弹性地震反应规律研究[D].重庆:重庆大学,2003.
[7]卢文峰,贾益纲.不规则多高层建筑抗震性能分析[J].江西科学,2007,25(1):10-13.
[8]TJHIN T,ASCHHEIM.Estimates of peak roof displace-ment using equivalent single degree of freedom systems[J].Journal of Structural engineering,2005,131:517-522.
[9]中华人民共和国建设部.GB50011-2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
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