基于地震响应分析的公路挡土结构物抗震动力可靠性
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摘要
提供了一种简单的确定性数值方法,分析在平稳随机地震荷载作用下的结构地震动力响应及动力可靠性。该方法基于有限元动力分析软件,以单位加速度脉冲函数作为地震荷载的输入,当计算出结构的脉冲响应函数后,再运用傅立叶变换得到随机激励和结构响应之间的传递函数,由此来计算结构的均方根响应和峰值响应。基于此方法,分析了挡土结构物在平稳随机地震荷载作用下的抗震动力可靠性,总结了挡土结构物的抗震可靠性的计算方法,并根据此分析方法给出了挡土墙结构抗震可靠性分析的流程,这也为可靠度方法应用于其它岩土领域的抗震设计方面提供了一定的参考。
A simple numerical deterministic approach to analyze the dynamic reliability of structure under the action of stationary random seismic action was proposed.The method was based on general FEM software for structure dynamic analysis,and the unit acceleration impulse function was used as the input of seismic load.After the impulse response function of the structure was obtained,the transfer function between the random excitation and response of the structure was adopted to calculate the mean square response and peak response by Fourier transform.On the basis of the proposed method,the dynamic reliability of retaining structure under the action of stationary random seismic action was analyzed,the calculation method of aseismic reliability of retaining structure was summarized,and the process of seismic reliability analysis was given,which could be a reference for application of the reliability method in seismic design in geotechnical field.
A simple numerical deterministic approach to analyze the dynamic reliability of structure under the action of stationary random seismic action was proposed.The method was based on general FEM software for structure dynamic analysis,and the unit acceleration impulse function was used as the input of seismic load.After the impulse response function of the structure was obtained,the transfer function between the random excitation and response of the structure was adopted to calculate the mean square response and peak response by Fourier transform.On the basis of the proposed method,the dynamic reliability of retaining structure under the action of stationary random seismic action was analyzed,the calculation method of aseismic reliability of retaining structure was summarized,and the process of seismic reliability analysis was given,which could be a reference for application of the reliability method in seismic design in geotechnical field.
引文
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[2]HUANG Chingchuan.Investigations of Soil RetainingStructures Damaged during the Chi-Chi Earthquake[J].Journal of the Chinese Institute of Engineers,2000,23(4):417-428.
[3]FANG Y S,YANG Y C,CHEN T J.Retaining WallsDamaged in the Chi-Chi Earthquake[J].CanadianGeotechnical Journal,2003,40(6):1142-1153.
[4]姚令侃,冯俊德,杨明.汶川地震路基震害分析及对抗震规范改进的启示[J].西南交通大学学报,2009(3):301-311.YAO Lingkan,FENG Junde,YANG Ming.DamageAnalysis of Subgrade Engineering in Wenchuan Earthquakeand Recommendations for Improving Seismic Design Code[J].Journal of Southwest Jiaotong University,2009(3):301-311.
[5]吉随旺,唐永建,胡德贵,等.四川省汶川地震灾区干线公路典型震害特征分析[J].岩石力学与工程学报,2009,28(6):1250-1260.JI Suiwang,TANG Yongjian,HU Degui et al.Analysis ofTypical Seismic Damages of Highways in WenchuanEarthquake-induced Hazard Areas in Sichuan Province[J].Chinese Journal of Rock Mechanics andEngineering,2009,28(6):1250-1260.
[6]TATSUOKA F,TATEYAMA M,MOHRI Y,et al.Remedial Treatment of Soil Structures Using Geosynthetic-reinforcing Technology[J].Geotextiles and Geomembranes,2007,25(4/5):204-220.
[7]周朝晖.2008年四川汶川8.0级地震强震动台网观测记录[J].四川地震,2008(4):25-29.ZHOU Chaohui.The Strong Ground Motion Recordings ofthe Ms8.0 Wenchuan Earthquake in Sichuan Province[J].Earthquake Research in Sichuan,2008(4):25-29.
[8]严松宏.地下结构随机地震响应分析及其动力可靠度研究[D].成都:西南交通大学,2003YAN Songhong.Study on Underground StructuralStochastic Seismic Response and Dynamic Reliability[D].Chengdu:Southwest Jiaotong University,2003.
[9]曹国安,地下结构随机地震响应和极值分析[D].北京:北方交通大学,1997.CAO Guo'an.Study on Underground Structural StochasticSeismic Response and Extremal Analysis[D].Beijing:Northern Jiaotong University,1997.
[10]ZHANG Hongru,XIA He,YAN Guiping,et al.PeakSeismic Response of Tall Building and Subsoil[C]//Proceedings of 2nd International Conference onMultipurpose High-Rise Structures and Tall Buildings.Singapore:[s.n.],1996,277-284.
[11]李桂青.结构动力可靠性理论及其应用[M].北京:地震出版社,1993.LI Guiqing.Theory of Structural Dynamic Reliability andApplications[M].Beijing:Seismological Press,1993.
[12]WU Yingwei.Displacement-based Analysis and Design ofRigid Retaining Walls during Earthquakes[D].USA:University of Missouri-Rolla,1999.
[13]HOUSNER G W.Charateristics of Strong Motion ofEarthquakes[J].Bulletin of the Seismological Society ofAmerica,1947,37(1):19-31.
[14]KANAI K.Semi-empirical Formula for SeismicCharacteristic of the Ground[R].Tokyo:TokyoUniversity,1957.
[15]欧进萍,牛荻涛.地震地面运动随机过程模型的参数及其结构效应[J].哈尔滨建筑工程学院学报,1990,10(2):70-76.OU Jinping,NIU Ditao.Parameters in the RandomProcess Models of Earthquake Ground Motion and TheirEffects on the Response of Structures[J].Journal ofHarbin Institute Technology,1990,10(2):70-76.
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