近断层地震动速度脉冲之桥梁地震反应敏感参数分析
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摘要
研究并确定近断层地震作用下桥梁地震反应的速度脉冲敏感参数是结构抗震设计的关键。基于距离发震断层15 km范围内的164条脉冲型近断层地震记录,采用数理统计分析方法,给出了建议的脉冲模型及其参数估计式。通过与实际记录时程和SDOF结构地震反应进行比较,说明了建议脉冲模型的合理性。通过建立空间桥梁结构模型,采用非线性有限元方法,计算分析了脉冲参数对桥梁结构地震反应的影响,确定了影响地震反应的脉冲敏感参数。
The sensitivity parameters of near-fault pulse-type motions are an essential foundation for structural seismic design subject to near-fault earthquake.Based on selected 164 near-fault earthquake records within 15km of fault projective distance,the proposed pulse model and estimated expressions of its parameters have been derived with the mathematics statistic analysis method.Comparing the time-history curve and the seismic response of SDOF structures for the near-fault ground motion and simulated pulse motion,the proposed velocity pulse model is reasonable.Using the proposed velocity pulse model,the finite element model of bridge was established,The influential parameters of velocity pulse on the seismic response of bridge were analyzed,and the important parameters of pulse model are given.
The sensitivity parameters of near-fault pulse-type motions are an essential foundation for structural seismic design subject to near-fault earthquake.Based on selected 164 near-fault earthquake records within 15km of fault projective distance,the proposed pulse model and estimated expressions of its parameters have been derived with the mathematics statistic analysis method.Comparing the time-history curve and the seismic response of SDOF structures for the near-fault ground motion and simulated pulse motion,the proposed velocity pulse model is reasonable.Using the proposed velocity pulse model,the finite element model of bridge was established,The influential parameters of velocity pulse on the seismic response of bridge were analyzed,and the important parameters of pulse model are given.
引文
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[3]MENUN C,QIANG F U.An analytical model for near-fault ground motions and the response of SDOF systems[C]//Seventh U.S.National Conference on EarthquakeEngineering.Boston:Massachusetts,2002.
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[5]李新乐.近断层区桥梁结构的设计地震与抗震性能研究[D].北京:北京交通大学,2005.[6〗LU L Y,SHIH M H,CHANG C S,et al.seismic per-formance of sliding isolated structures in near-fault Ar-eas[C]//Seventh U.S.National Conference on Earth-quake Engineering.Boston:Massachusetts,2002.
12th World Conference on Earthquake Engineering.NewZealand:New Zealand Society for Earthquake Engineer-ing,2000.
[2]MAKRIS N,ROUSSOS Y.Rocking response and over-turning of equipment under horizontal pulse-type mo-tions PEER Report1998-05[R].College of Engineer-ing University of California,Berkeley,1998.
[3]MENUN C,QIANG F U.An analytical model for near-fault ground motions and the response of SDOF systems[C]//Seventh U.S.National Conference on EarthquakeEngineering.Boston:Massachusetts,2002.
[4]李新乐,朱②.近断层地震动等效速度脉冲研究[J].地震学报,2004,26(6):634-643.
[5]李新乐.近断层区桥梁结构的设计地震与抗震性能研究[D].北京:北京交通大学,2005.[6〗LU L Y,SHIH M H,CHANG C S,et al.seismic per-formance of sliding isolated structures in near-fault Ar-eas[C]//Seventh U.S.National Conference on Earth-quake Engineering.Boston:Massachusetts,2002.
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