本文選題：震害 + 場地條件　； 參考：《中國地震局蘭州地震研究所》2017年碩士論文

【摘要】：場地的覆蓋土層、地形地貌以及地下復雜的地質(zhì)結(jié)構(gòu)對地震動有十分重要的影響,它所引起的地震動差別可以造成不同場地上建筑物震害的差異。在進行大范圍地震災害預測和抗震設計時如何考慮復雜場地的差異性,如何估計此類場地在未來可能發(fā)生強震作用下的地震動參數(shù)分布等都是亟待解決的難題。本論文在前人工作的基礎上,分別以平坦場地、起伏場地為研究對象,采用數(shù)值模擬的方法探究場地特征參數(shù)對地震場地動力變化的影響規(guī)律,提出表征地震動變化的場地特征參數(shù),然后將所得結(jié)果應用于復雜區(qū)域場地的地震動預測中。本論文研究結(jié)果可為區(qū)域地震動預測提供理論依據(jù),為制定區(qū)域長期發(fā)展規(guī)劃和建筑抗震設計提供重要的基礎資料,在防震減災領域具有實際應用價值。論文獲得的主要進展如下:1.構(gòu)建56個水平場地模型,針對設防烈度VIII的區(qū)域選擇了三種地震水平,采用一維等效線性化方法研究了三種地震作用下不同類別場地峰值加速度的變化規(guī)律,得到峰值加速度放大系數(shù)K分別與場地地面運動變化的表征參數(shù)Vse和Vs30的定量關(guān)系。2.運用ABAQUS軟件建立起伏場地的有限元模型,探究不同地震動作用下起伏場地峰值加速度及頻譜特性的變化特征,指出起伏場地受地形和土層共同作用,其放大效應約等于地形和土層各自單獨放大效應的乘積。3.以設防烈度VIII的禮縣地區(qū)為研究對象,通過地脈動觀測與鉆孔數(shù)據(jù)分析給出了場地卓越周期與等效剪切波速、覆蓋層厚度的計算公式,并獲得了研究區(qū)覆蓋層厚度分布圖、等效剪切波速Vse以及Vs30分布圖。4.采用Vse和Vs30作為場地地震動力變化的表征參數(shù),運用峰值加速度放大系數(shù)K分別與Vse和Vs30的定量關(guān)系預測禮縣地區(qū)不同場地的地震動變化,并由一維等效線性化計算結(jié)果進行了驗證。研究結(jié)果為區(qū)域范圍內(nèi)工程抗震和防災減災提供了合理的地震動參數(shù)。
[Abstract]:The ground motion is affected by the overlying soil, topographic landform and complicated geological structure. The difference of ground motion caused by the ground motion can cause the difference of earthquake damage of buildings on different sites.How to consider the difference of complex sites and how to estimate the distribution of seismic parameters of such sites under the action of strong earthquakes in the future is a difficult problem to be solved in earthquake disaster prediction and seismic design on a large scale.On the basis of previous work, this paper takes flat site and undulating site as research objects, and uses numerical simulation method to study the influence of site characteristic parameters on dynamic change of seismic site.The site characteristic parameters representing the variation of ground motion are presented, and the results obtained are applied to the prediction of ground motion in complex regions.The results of this paper can provide theoretical basis for regional ground motion prediction, provide important basic data for regional long-term development planning and seismic design of buildings, and have practical application value in the field of earthquake prevention and disaster reduction.The main progress of the thesis is as follows: 1.In this paper, 56 horizontal site models are constructed, three seismic levels are selected for the region of fortified intensity VIII, and the variation law of peak acceleration of different types of sites under three kinds of earthquakes is studied by using one-dimensional equivalent linearization method.The quantitative relationship between peak acceleration magnification factor K and ground motion parameters Vse and Vs30 is obtained.The finite element model of undulating site is established by using ABAQUS software, and the variation characteristics of peak acceleration and spectrum characteristic of undulating site under different ground motion are studied, and it is pointed out that the undulating site is affected by topography and soil layer together.The magnification effect is about equal to the product. 3 of the individual magnification effect of topography and soil layer.Taking Lixian area with fortification intensity VIII as the research object, through ground pulsation observation and borehole data analysis, the formulas of site excellent period, equivalent shear wave velocity and overburden thickness are given, and the distribution map of overburden thickness in the study area is obtained.Equivalent shear wave velocity Vse and Vs30 distribution. 4.Vse and Vs30 are used as the characterization parameters of site seismic dynamic change, and the quantitative relationship between peak acceleration magnification factor K and Vse and Vs30 is used to predict the ground motion change of different sites in Lixian area.The results of one-dimensional equivalent linearization are verified.The results provide reasonable ground motion parameters for earthquake resistance and disaster prevention and mitigation in regional engineering.
【學位授予單位】：中國地震局蘭州地震研究所
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P315.9

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