现行土层地震反应分析存在的问题
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摘要
工程上广泛应用的现行土层地震反应分析方法即为借助快速傅里叶变换和迭代法的等效线性化频域方法。简要介绍了现行土层地震反应分析方法,结合具体算例,再现了现行土层地震反应分析方法在实际应用中存在的四个问题,一是对个别输入加速度时程的离散点个数无效,二是底部存在软夹层计算结果异常,三是输入地震动较大、场地较软时计算结果不合理,四是可能出现死循环现象。针对这四个问题提出了现行土层地震反应分析方法改进的方向,对以后土层地震反应分析方法的发展进行了展望。
The current widely used methods of seismic response analysis for soil layers in engineering are equivalent linearization frequency domain method which is based on FFT and iterative method.This article briefly introduces these methods and reappears the four problems existing in them in combination with practical work.Firstly,the program could not run when some individual discrete point numbers from acceleration time history are input.Secondly,the calculation results become abnormal when soft layer exists at the bottom of a soil profile.Thirdly,the calculation results seem unreasonable under stronger input earthquake motions and softer sites.Fourthly,dead cycle phenomena may occur.Directions aiming at solving the 4 problems are pointed out to perfect current method of seismic response analysis for soil layers,the development direction is also prospected.
The current widely used methods of seismic response analysis for soil layers in engineering are equivalent linearization frequency domain method which is based on FFT and iterative method.This article briefly introduces these methods and reappears the four problems existing in them in combination with practical work.Firstly,the program could not run when some individual discrete point numbers from acceleration time history are input.Secondly,the calculation results become abnormal when soft layer exists at the bottom of a soil profile.Thirdly,the calculation results seem unreasonable under stronger input earthquake motions and softer sites.Fourthly,dead cycle phenomena may occur.Directions aiming at solving the 4 problems are pointed out to perfect current method of seismic response analysis for soil layers,the development direction is also prospected.
引文
[1]廖振鹏,李小军.地表土层地震反应的等效线性化解法[A].地震小区划(理论与实践)[C].北京:地震出版社,1989.
[2]齐文浩,薄景山.土层地震反应等效线性化方法综述[J].世界地震工程,2007,23(4):221-226.
[3]Idriss I M,Seed H B.Seismic response of horizontal soil layers[J].Journal of the Soil Mechanics and Foundation Division,American Society of Civil Engineers,1968,95(4):693-698.
[4]Idriss I.M.,Sun.Josephi.User’s manual for SHAKE91—A computer program for conducting equivalent linear seismic response analyses of horizontally layered soil deposits:Center for Geotechnical Modeling[R].Department of Civil&Environmental Engineering,University of California,Davis,California,August 1992.
[5]李小军.一维土层地震反应线性化计算程序[A]//地震小区划(理论与实践)[C].北京:地震出版社,1989,250-265.
[6]齐文浩.土层地震反应分析方法的比较研究[D].哈尔滨:中国地震局工程力学研究所,2004.
[7]薄景山.场地分类和设计反应谱调整方法研究[R].哈尔滨:中国地震局工程力学研究所,1998.
[8]海口市地震局,中国地震局工程力学研究所,海南地学工程研究中心.海口市防震减灾规划基础研究[Z].1999.
[9]哈尔滨市群力污水处理厂工程场地地震安全性评价报告[R].哈尔滨:中国地震局工程力学研究所,2007.
[2]齐文浩,薄景山.土层地震反应等效线性化方法综述[J].世界地震工程,2007,23(4):221-226.
[3]Idriss I M,Seed H B.Seismic response of horizontal soil layers[J].Journal of the Soil Mechanics and Foundation Division,American Society of Civil Engineers,1968,95(4):693-698.
[4]Idriss I.M.,Sun.Josephi.User’s manual for SHAKE91—A computer program for conducting equivalent linear seismic response analyses of horizontally layered soil deposits:Center for Geotechnical Modeling[R].Department of Civil&Environmental Engineering,University of California,Davis,California,August 1992.
[5]李小军.一维土层地震反应线性化计算程序[A]//地震小区划(理论与实践)[C].北京:地震出版社,1989,250-265.
[6]齐文浩.土层地震反应分析方法的比较研究[D].哈尔滨:中国地震局工程力学研究所,2004.
[7]薄景山.场地分类和设计反应谱调整方法研究[R].哈尔滨:中国地震局工程力学研究所,1998.
[8]海口市地震局,中国地震局工程力学研究所,海南地学工程研究中心.海口市防震减灾规划基础研究[Z].1999.
[9]哈尔滨市群力污水处理厂工程场地地震安全性评价报告[R].哈尔滨:中国地震局工程力学研究所,2007.
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