不同类别场地下两种典型等效线性化程序对比

发布时间：2018-05-26 02:30

本文选题：土层地震反应分析 + 等效线性化　；参考：《中国地震局工程力学研究所》2015年硕士论文

【摘要】：对工程场地进行地震安评工作时,要用到场地地震动参数。场地地震动参数主要为场地地震动峰值(峰值加速度、峰值速度、峰值位移)、反应谱与时程强度包络函数等。其中,最为常用的为地震动峰值加速度与加速度反应谱。一维分析模型进行地震反应分析主要应用于地面、土层及基岩面较为平坦的场地,目前主流的程序有LSSRLI-1与SHAKE2000。二者的都是基于等效线性化方法来计算土层地震反应的程序。其中,国内目前广泛应用的LSSRLI-1等效线性化程序起始于上世纪80年代,与目前代表国际先进水平的SHAKE2000存在一些计算结果上的差异。本文以SHAKE2000为参照,对比二者的计算结果,了解其差异所在,为下一步的程序改进工作提供基础。本文主要内容为:1、介绍国内土层反应分析方法的研究现状,介绍等效线性化方法,介绍LSSRLI-1与SHAKE2000两个程序。2、构造理想计算剖面,选取输入地震波与土的非线性曲线。3、利用LSSRLI-1与SHAKE2000两个程序,对四种类型的场地进行计算,对比地表峰值加速度、地表加速度反应谱与土层剪应变之间的差异,总结其规律。4、将四类场地在两种非线性条件下的计算结果进行整体分析,得到两个程序间差异与场地分类、输入地震波、土的非线性条件的关系,得到LSSRLI-1与SHAKE2000计算出的地表反应差异的一般性规律。
[Abstract]:Ground motion parameters should be used in seismic safety assessment of engineering site. The parameters of ground motion are mainly the peak value of ground motion (peak acceleration, peak displacement), response spectrum and time-history intensity envelope function. Among them, the most commonly used is the peak acceleration and acceleration response spectrum of ground motion. The seismic response analysis based on one-dimensional analysis model is mainly used in the field where the surface, soil layer and bedrock surface are relatively flat. At present, the main programs are LSSRLI-1 and SHAKE2000. Both programs are based on the equivalent linearization method to calculate the seismic response of soil layer. The LSSRLI-1 equivalent linearization program, which is widely used in China at present, started in the 1980s, and there are some differences between the results of calculation and that of SHAKE2000, which represents the international advanced level. In this paper, SHAKE2000 is used as a reference to compare the results of their calculations, to understand the differences, and to provide a basis for the next work of program improvement. This paper introduces the research status of soil layer response analysis method in China, introduces the equivalent linearization method, and introduces two programs, LSSRLI-1 and SHAKE2000, to construct the ideal calculation profile. Selecting the nonlinear curve of input seismic wave and soil. 3, using LSSRLI-1 and SHAKE2000 program to calculate four kinds of sites, comparing the difference between the peak acceleration, the response spectrum of ground acceleration and the shear strain of soil layer. Summing up its rule. 4, the results of four kinds of sites under two nonlinear conditions are analyzed as a whole, and the relationship between the difference between the two programs and the site classification, the input of seismic wave and the nonlinear condition of soil is obtained. The general law of surface response difference calculated by LSSRLI-1 and SHAKE2000 is obtained.
【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P315.9

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