【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。更多还原

【Abstract】 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.更多还原