本文選題：土體動力本構(gòu)模型　切入點(diǎn)：傅里葉變換　出處：《安徽建筑大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：為防御地震造成的災(zāi)害而采取的重要工程措施之一是場地的地震反應(yīng)分析,并且地震反應(yīng)分析的數(shù)據(jù)結(jié)果為抗震設(shè)防及提高工程結(jié)構(gòu)的抗震水平提供重要的參考依據(jù)。按照土體的動力特性,對場地地震反應(yīng)分析方式可分為線性化方法和并行有限元非線性方法。其中等效線性化方法容易被應(yīng)用,操作和原理簡單,適合小震分析或是橫向均勻的情況,同時(shí)其最后分析時(shí)采用“放大低頻,縮小高頻”的方法,而在處理強(qiáng)震作用和復(fù)雜場地下的反應(yīng)分析時(shí)其準(zhǔn)確性會受到影響,因此采用線性方法存在局限性,非線性方法處理非均勻場地更加合理,但在實(shí)際操作處理結(jié)果時(shí)參數(shù)較多,參數(shù)選取受很多因素影響,一般在專業(yè)性的科學(xué)研究中被采用,在實(shí)際工程方案中應(yīng)用并不是很廣泛,在接下來研究工作中需要對其方法進(jìn)行改進(jìn)與完善。本文根據(jù)實(shí)測的鉆孔地震波波速測試以及地震安全性評價(jià)工作中的場地鉆孔參數(shù)資料,在一維場地等效線性化原理基礎(chǔ)上,采用場地地震反應(yīng)分析程序?qū)蓚�(gè)具體場地進(jìn)行了相應(yīng)勘測資料的數(shù)值計(jì)算和分析研究。本文主要工作和研究內(nèi)容如下:1、對本課題的研究背景以及現(xiàn)實(shí)意義進(jìn)行了概述,對國內(nèi)外在該領(lǐng)域的有關(guān)發(fā)展及主要的研究方法、研究現(xiàn)狀進(jìn)行了總結(jié)說明。2、對幾種土體動力本構(gòu)關(guān)系常見的模型進(jìn)行了介紹與對比分析,并且對滯回曲線在不同應(yīng)力下的規(guī)律進(jìn)行了研究分析。3、重點(diǎn)分析在眾多水平成層場地反應(yīng)分析中較成熟的兩種方法的原理及適用范圍,即采用解析方法分析一維場地模型地震反應(yīng)和采用半解析方法分析不同參數(shù)下非線性變化的土層的動力特征及地震反應(yīng)分析。4、詳細(xì)分析水平成層場地地震反應(yīng)中采用集中質(zhì)量法思想進(jìn)行分析的時(shí)域分析方法,在具體程序MATLAB編程用到了可以減少計(jì)算量的傅里葉變換,并且闡述了地震分析反應(yīng)中應(yīng)用比較多的三種程序(DENSOR98、SHAKE91、LSSRLI-1),重點(diǎn)分析了前兩種程序的原理及使用方案。在此基礎(chǔ)上作者對編程進(jìn)行了研究,得到了分析場地的編程語言。5、根據(jù)兩個(gè)具體工程鉆孔實(shí)際觀測資料及動力參數(shù),在理想的土層一維波動模型基礎(chǔ)上使用等效線性化方法對場地地震反應(yīng)進(jìn)行計(jì)算,由基巖處的加速度得到場地地表處峰值加速度反應(yīng)譜分析結(jié)果,并對其平均反應(yīng)譜曲線進(jìn)行計(jì)算,給出該工程場地地表水平向5%阻尼比的規(guī)準(zhǔn)化反應(yīng)譜曲線。以此做為規(guī)范中所要求的設(shè)計(jì)反應(yīng)譜形式進(jìn)行技術(shù)銜接的科學(xué)依據(jù)。6、簡要總結(jié)適用于復(fù)雜地層的二維、三維場地反應(yīng)分析模型,對以后尚且需要解決的問題及開展工作的提出建議。
[Abstract]:One of the important engineering measures taken to prevent disasters caused by earthquakes is the seismic response analysis of the site. The results of seismic response analysis provide an important reference for seismic fortification and improvement of seismic level of engineering structures, according to the dynamic characteristics of soil, The seismic response analysis of the site can be divided into linearization method and parallel finite element nonlinear method, in which the equivalent linearization method is easy to be applied, simple in operation and principle, and suitable for the case of small earthquake analysis or lateral uniformity. At the same time, the method of "enlarge the low frequency, reduce the high frequency" is adopted in the final analysis, but the accuracy of the analysis of the underground response of the strong earthquake action and the complex field will be affected, so the linear method has some limitations. The nonlinear method is more reasonable to deal with the non-uniform site, but it has many parameters in practical operation, and the selection of parameters is affected by many factors, so it is generally used in professional scientific research. It is not widely used in practical engineering projects. In the following research work, it is necessary to improve and perfect the method. Based on the measured data of borehole seismic wave velocity and site borehole parameters in seismic safety evaluation, based on the one-dimensional site equivalent linearization principle, The numerical calculation and analysis of the corresponding survey data of two specific sites are carried out by using the site seismic response analysis program. The main work and contents of this paper are as follows: 1. The research background and practical significance of this subject are summarized. The development and main research methods in this field at home and abroad are summarized. 2. Several common models of soil dynamic constitutive relations are introduced and compared. And the law of hysteretic curve under different stress is studied. 3. The principle and application range of two methods which are more mature in the field response analysis of many horizontal layers are emphatically analyzed. That is, using analytical method to analyze the seismic response of one-dimensional site model and semi-analytical method to analyze the dynamic characteristics and seismic response of soil layer with nonlinear variation under different parameters .4.The seismic response of horizontal stratified site is analyzed in detail. The time domain analysis method based on lumped mass method, In the specific program MATLAB programming used to reduce the amount of calculation of Fourier transform, Three programs, DENSOR98 / SHAKE91 / LSSRLI-1, which are widely used in seismic analysis and response are described. The principle and application scheme of the former two programs are emphatically analyzed. On the basis of this, the author studies the programming. The programming language .5for analyzing the site is obtained. According to the actual observation data and dynamic parameters of the drilling holes in two concrete projects, the equivalent linearization method is used to calculate the seismic response of the site on the basis of the ideal one-dimensional wave model of soil layer. The peak acceleration response spectrum of the ground surface is obtained from the acceleration at the bedrock, and the average response spectrum curve is calculated. The normalized response spectrum curve of the horizontal damping ratio of 5% on the ground surface of the project site is given, which is used as the scientific basis for the technical connection of the design response spectrum form required in the specification, and a brief summary of the two-dimensional response spectrum suitable for complex strata is given. Three-dimensional site response analysis model, to the future need to solve the problems and put forward suggestions for the work.
【學(xué)位授予單位】：安徽建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU435

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本文編號：1624728