现行土层地震反应分析存在的问题  

Problems Existing in Current Seismic Response Analysis for Soil Layers

作　　者：刘德东[1] 齐文浩[1] 张宇东[2] 兰景岩[3] 

机构地区：[1]中国地震局工程力学研究所,黑龙江哈尔滨150080 [2]防灾科技学院,河北三河065201 [3]中国地震局地壳应力研究所,北京100085

出　　处：《防灾科技学院学报》2009年第3期34-37,共4页Journal of Institute of Disaster Prevention

基　　金：中国地震局工程力学研究所基本科研业务费专项(编号2008B008)资助;中央级公益性科研院所基本科研业务专项(项目批准号ZDJ2008-05)

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.

关 键 词：现行土层地震反应分析 等效线性化频域方法 问题 改进 

分 类 号：P315.9[天文地球—地震学]