桩-土-结构体系随机地震响应的实用计算方法及参数分析
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摘要
考虑地震的随机性和土体的非线性,引入粘弹性边界,提出了一种在谐响应分析中直接输入加速度的加载方式,建立了基于虚拟激励法、等效线性化法和确定性动力有限元法相结合的非线性桩-土-结构体系随机地震响应的实用计算方法。采用该法对单桩支承的剪切型结构进行了较为全面的参数分析。结果表明基岩地震动输入水平,桩长度和土体模量都对结构反应有较大影响。该方法可方便的用于随机地震下桩-土-结构体系的参数分析中。
Considering the randomness of earthquake and the nonlinearity of soil,introducing viscous-spring boundary,a loading pattern of inputting acceleration directly in harmonic response analysis is proposed.The practical calculation method of stochastic vibration response for pile-soi-structure interaction system based on pseudo-excitation method,equivalent linearization method and definite dynamic finite element method is presented.The parametric analyses of the single end-bearing pile structure are conducted in detail using this method.The results show that the parameters as inputting ground motion,pile length and soil modulu have obvious effect to seismic response of the system.The method could be employed to perform parametric analysis of pile-soil-structure interaction system subject with stochastic earthquake conveniently.
Considering the randomness of earthquake and the nonlinearity of soil,introducing viscous-spring boundary,a loading pattern of inputting acceleration directly in harmonic response analysis is proposed.The practical calculation method of stochastic vibration response for pile-soi-structure interaction system based on pseudo-excitation method,equivalent linearization method and definite dynamic finite element method is presented.The parametric analyses of the single end-bearing pile structure are conducted in detail using this method.The results show that the parameters as inputting ground motion,pile length and soil modulu have obvious effect to seismic response of the system.The method could be employed to perform parametric analysis of pile-soil-structure interaction system subject with stochastic earthquake conveniently.
引文
[1]董娣,刘锐,桑向国.随机方法模拟地震动的应用研究[J].西北地震学报,2006,28(4):298-302.
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[14]周爱红,张鸿儒,袁颖.土工结构随机地震响应分析实用方法研究[A]∥中国土木工程学会第十届土力学及岩土工程学术会议[C].重庆:重庆大学出版社,2007:604-608.
[15]李桂青,等.结构动力可靠性理论及其应用[M].北京:地震出版社,1993.
[2]何晴光,杜永峰,程选生.基于虚拟激励法的消能减震结构随机响应分析[J].西北地震学报,2008,30(4):366-368.
[3]林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004.
[4]周爱红,袁颖,张鸿儒.基于ANSYS二次开发技术的土层随机地震反应分析[J].煤炭学报,2007,32(11):5711-8711.
[5]Housner G W.Characteristics of Strong Motion Earthquake[J].BSSA,1947,37(1):125-138.
[6]Housner G W.Characteristics of Strong Motion Earthquake[J].BSSA,1945,45(3):457-472.
[7]Kanai K.Semi-empirical Formula for the Seismic Characteris-tics of the Ground[J].Bulletin of the Earthquake Research In-stitute[J].University of Tokyo,1957,35:306-325.
[8]Tajimi H.A Statistical Method of Determining the MaximumResponse of a Building Structure during an Earthquake[A]∥Proc.,Second World Conf.On Earth.Eng.[C].Tokyo:[s.n.],1960.
[9]Ruiz P,Penzien J.Probabilistic Study of the Behavior ofStructures during Earthquakes[R].Earthquake Eng.C.,UCB,CA,Report No.EERC 69-03,1969.
[10]欧进萍,牛获涛,杜修力.设计用随机地震动的模型及其参数确定[J].地震工程与工程振动,1991,11(3):45-53.
[11]孙景仁,江近仁.与规范反应谱对应的金井清谱的参数[J].世界地震工程,1990,(1):42-48.
[12]吴再光.土层随机地震反应的一种改进算法[J].振动工程学报,1990,3(1):56-59.
[13]王振宇,刘晶波.成层地基非线性波动问题人工边界与波动输入研究[J].岩石力学与工程学报,2004,23(7):1169-1173.
[14]周爱红,张鸿儒,袁颖.土工结构随机地震响应分析实用方法研究[A]∥中国土木工程学会第十届土力学及岩土工程学术会议[C].重庆:重庆大学出版社,2007:604-608.
[15]李桂青,等.结构动力可靠性理论及其应用[M].北京:地震出版社,1993.
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