近场脉冲效应对强度折减系数的影响分析
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摘要
近场脉冲型地震动具有十分巨大的潜在破坏性。以集集地震提供的近场地震动记录为基础,利用统计分析的方法研究近场脉冲效应对强度折减系数的影响规律,并给出近场脉冲效应影响强度折减系数的修正公式。结果表明:在长周期频段,近场速度脉冲型地震动给出的强度折减系数与一般地震动给出的强度折减系数趋向于一致,而在中短周期频段,近场速度脉冲型地震动给出的强度折减系数显著小于一般地震动给出的强度折减系数,这表明如果用现有的强度折减系数模型(都是远场地震动给出的强度折减系数)应用到近场地区,则可能是比较危险的;对某一给定的周期,随延性系数的增大,近场速度脉冲型地震动给出的强度折减系数与一般地震动给出的强度折减系数的差异也越大。
Strong adjacent-field pulse ground motions pose severe potential damage to the structures.Based on the large number of adjacent-field velocity-pulse ground motions recorded in the Chi-Chi earthquake(Taiwan September 20,1999),the effect of adjacent-field velocity-pulse on the strength reduction factors is statistically investigated and expressions for the modification of the strength reduction factors are established.It is concluded that in the long period range,the strength reduction factors for the adjacent-field velocity-pulse ground motions tend to be consistent with those for far-field ground motions.But,in the short or medium period range,the strength reduction factors for the adjacent-field velocity-pulse ground motions are significantly smaller than those from the far-field ground motions,making it unsafe,in adjacent areas,to use the current strength reduction factors,which were obtained for far-field ground motions.For a given period,the adjacent-field effect on the strength reduction factors increases with the structure ductility coefficient.
Strong adjacent-field pulse ground motions pose severe potential damage to the structures.Based on the large number of adjacent-field velocity-pulse ground motions recorded in the Chi-Chi earthquake(Taiwan September 20,1999),the effect of adjacent-field velocity-pulse on the strength reduction factors is statistically investigated and expressions for the modification of the strength reduction factors are established.It is concluded that in the long period range,the strength reduction factors for the adjacent-field velocity-pulse ground motions tend to be consistent with those for far-field ground motions.But,in the short or medium period range,the strength reduction factors for the adjacent-field velocity-pulse ground motions are significantly smaller than those from the far-field ground motions,making it unsafe,in adjacent areas,to use the current strength reduction factors,which were obtained for far-field ground motions.For a given period,the adjacent-field effect on the strength reduction factors increases with the structure ductility coefficient.
引文
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[2]Iwan W D,Huang C T,GuyaderA C.Importantfeatures ofthe response ofinelastic structures to near-field ground mo-tions[C]//Proceedings of 12W CEE.Auckland,NewZealand:2000
[3]Chopra A K,Chintanapakdee C.Comparing response ofSDFsystems to near-faultand far-faultearthquake motions in thecontextofspectralregions[J].Earthquake Engineering andStructuralDynamics,2001,30(12):1769-1789
[4]王国权.921台湾集集地震近断层地面运动特征[D].北京:中国地震局地质研究所,2001
[5]W ang G Q,Zhou X Y,Zhang P Z,etal.Characteristics ofamplitude and duration for near faultstrong ground motionfrom 1990 Chi-Chi,Taiwan earthquake[J].SoilDynamicsand EarthquakeEngineering,2002,22(1):73-96
[6]Lee W H K,Shin T C,Kuo K W,etal.CW B free-fieldstrong ground motion data from the 921 Chi-Chiearthquake:processed acceleration files on CD-ROM,strong-motion dataseries CD-001[R].Taipei:Seismological Observation Cen-ter,2001
[7]俞言祥,高孟潭.台湾集集地震近场地震动的上盘效应[J].地震学报,2001,23(6):615-621
[8]王京哲,朱唏.近场地震速度脉冲下的反应谱加速度敏感区[J].中国铁道科学,2003,24(6):27-30
[9]Liao W I,Loh C H,W an S.Earthquake response of RCmomentframes subjected to near-faultground motions[J].TheStructuralDesign ofTallBuildings,2001,10(3):219-229
[10]HwangJH,YangC W.Verification ofcriticalcyclic strengthcurve by Taiwan Chi-Chiearthquake data[J].SoilDynam-icsand EarthquakeEngineering,2001,21(3):237-257
[11]Loh C H,W an S,Liao W I.Effectsofhysteretic modelonseismic demands:consideration ofnear-faultground motions[J].The StructuralDesign ofTallBuildings,2002,11(3):155-169
[12]Sokolova V Y,Loh C H,W en K L.Evaluation ofhard rockspectralmodels for the Taiwan region on the basis of the1999 Chi-Chi earthquake data[J].Soil Dynamics andEarthquakeEngineering,2003,23(8):715-735
[13]翟长海.最不利设计地震动及强度折减系数研究[D].哈尔滨:哈尔滨工业大学,2005
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