码头成层地基中地震动的非线性反演方法
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摘要
为了合理地对某码头结构进行抗震分析,采用非线性土层随机地震反应分析方法,结合自由场地地表处测得的地震加速度记录,反演得到了基岩加速度,为结构抗震分析提供了合理的地震动输入。由于土体是一种显著的非线性材料,采用一种简化的方法求解剪切模量和阻尼比,从而确立了土体的动力本构关系,建立了非线性反演方法。最后,结合某高桩码头工程,对该工程地表加速度进行了非线性反演得到基岩地震动。计算结果表明该反演方法是正确的,有着较高的精度。
For a reasonable seismic analysis of a quay structure,this paper presents a method that can be used to inverse bedrock ground motion based on the method for calculating the response of nonlinear soil layer with random earthquake analysis,combining with the record of earthquake acceleration obtained from free ground surface,and provide reliable earthquake motion inputs for the seismic analysis.Because the nonlinear properties of soil are very significant,a simplified method is adopted to solve the deformation modulus and damping ratio to establish the dynamic constitutive,and propose a nonlinear inversion method.Finally,combining with an actual project of a high-piled quay,the input ground motion in the bedrock is obtained by the inversion method based on the surface motion,the result of which shows that the method is correct and has a high precision.
For a reasonable seismic analysis of a quay structure,this paper presents a method that can be used to inverse bedrock ground motion based on the method for calculating the response of nonlinear soil layer with random earthquake analysis,combining with the record of earthquake acceleration obtained from free ground surface,and provide reliable earthquake motion inputs for the seismic analysis.Because the nonlinear properties of soil are very significant,a simplified method is adopted to solve the deformation modulus and damping ratio to establish the dynamic constitutive,and propose a nonlinear inversion method.Finally,combining with an actual project of a high-piled quay,the input ground motion in the bedrock is obtained by the inversion method based on the surface motion,the result of which shows that the method is correct and has a high precision.
引文
[1]胡进军,谢礼立.地震动幅值沿深度变化研究[J].地震学报,2005,27(1):88-99.
[2]廖振鹏.工程波动理论导论[M].北京:科学出版社,2004.
[3]刘峥,邓建华,钟蜀晖.不同输入界面土层地震反应的探讨[J].贵州工业大学学报,2007,36(5):68-71.
[4]蔡袁强,凌道盛,周迪永,等.非线性分层地基地面运动反演分析[J].振动工程学报,2000,13(3):426-432.
[5]解振涛,张俊发,田勇,等.地面地震动时程向地层深处反演研究[J].西安理工大学学报,2007,23(4):418-421.
[6]冯旭,李雪源,周黎.结构动力计算地震波的反演分析[J].西北农林科技大学学报,2005,33(3):121-123.
[7]胡少伟.结构振动理论及其应用[M].北京:中国建筑工业出版社,2005.
[8]潘晓东,董天乐,蔡袁强,等.非线性成层地基下基岩平稳地震动输入[J].振动工程学报,2000,13(3):246-251.
[9]黄义,王春玲,曹彩琴.成层地基一维土层对地震的随机反应分析[J].世界地震工程,2004,20(1):127-132.
[10]蒋维强.土层地震反应分析的地面加速度峰值计算研究[J].防灾减灾学报,2005,25(3):283-287.
[11]李辉,刘立平,赖明.基于地面地震反应输入的自由场地震反应分析[J].四川建筑科学研究,2004,30(3):94-97.
[12]解振涛.层状场域内上、下部结构动力相互作用的地震动输入问题研究[D].西安:西安理工大学,2007.
[2]廖振鹏.工程波动理论导论[M].北京:科学出版社,2004.
[3]刘峥,邓建华,钟蜀晖.不同输入界面土层地震反应的探讨[J].贵州工业大学学报,2007,36(5):68-71.
[4]蔡袁强,凌道盛,周迪永,等.非线性分层地基地面运动反演分析[J].振动工程学报,2000,13(3):426-432.
[5]解振涛,张俊发,田勇,等.地面地震动时程向地层深处反演研究[J].西安理工大学学报,2007,23(4):418-421.
[6]冯旭,李雪源,周黎.结构动力计算地震波的反演分析[J].西北农林科技大学学报,2005,33(3):121-123.
[7]胡少伟.结构振动理论及其应用[M].北京:中国建筑工业出版社,2005.
[8]潘晓东,董天乐,蔡袁强,等.非线性成层地基下基岩平稳地震动输入[J].振动工程学报,2000,13(3):246-251.
[9]黄义,王春玲,曹彩琴.成层地基一维土层对地震的随机反应分析[J].世界地震工程,2004,20(1):127-132.
[10]蒋维强.土层地震反应分析的地面加速度峰值计算研究[J].防灾减灾学报,2005,25(3):283-287.
[11]李辉,刘立平,赖明.基于地面地震反应输入的自由场地震反应分析[J].四川建筑科学研究,2004,30(3):94-97.
[12]解振涛.层状场域内上、下部结构动力相互作用的地震动输入问题研究[D].西安:西安理工大学,2007.
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