【摘要】：大量震害調查、強震動觀測數(shù)據(jù)以及理論研究結果表明,場地條件對地震動的幅值特性及頻譜特性有著顯著影響,進而直接影響著建設工程的震害程度。因此,根據(jù)場地條件進行場地地震反應分析,確定合理、可靠的場地地震動參數(shù)就成為地震區(qū)劃、工程場地地震安全性評價以及工程結構抗震分析的關鍵技術問題。場地地震反應分析涉及土層下臥基巖輸入地震動參數(shù)、土層介質動力模型及土層地震反應計算方法等問題,各個問題之間相互影響、相互聯(lián)系,同時這其中也蘊含著影響最終場地地震動參數(shù)的諸多不確定因素。地震動參數(shù)的不確定性將最終影響工程抗震設防要求確定的合理性與安全性。鑒于以上問題,本文在傳統(tǒng)地震動合成及場地地震反應分析理論的基礎上,對場地地震反應分析應用于工程實際所存在的部分基本問題展開研究,提出了能夠滿足工程要求的地震動合成方法及場地地震反應計算方法,并分析了輸入地震動的不確定性對場地地震動參數(shù)的影響,具體工作如下:1、研究了基于三角級數(shù)疊加法的傳統(tǒng)地震動合成方法,并以此為基礎,提出了一種擬合加密控制點目標反應譜的地震動合成方法,其中加密后的控制點個數(shù)與進行傅里葉變換的頻率點個數(shù)相一致。本文方法還考慮了合成地震動時程存在的基線飄移問題,并在此基礎上提出了加入脈沖函數(shù)的時域基線校正方法以及傅里葉幅值調整的頻域基線校正方法;2、基于頻域波動原理,編制了一維等效線性化場地地震反應計算程序SSRC11.exe,并通過實際場地資料及臺陣觀測記錄對該程序進行正演與反演計算的適用性進行研究;3、根據(jù)本文提出的地震動合成方法以及場地反應計算方法,通過建立場地模型,考慮了基于等效線性化方法進行反演分析存在的相關問題,并研究了考慮土結相互作用的重大工程結構的合理輸入地震動的確定方法;4、分析了輸入地震動的隨機性在不同場地條件、不同輸入地震動強度下對場地地震動參數(shù)的影響程度,同時,對目前重大工程場地地震安全性評價應用的地震動輸入數(shù)量是否能夠給出場地地震動參數(shù)穩(wěn)定的統(tǒng)計值進行了評價,為合理地確定輸入基巖地震動樣本數(shù)量,進而得到合理、可靠的場地地震反應計算結果提供理論依據(jù)。本文不僅開展了地震動的合成以及場地地震反應分析方法的理論研究,還基于實際的地震工程應用,分析了合成地震動頻譜成分對反演結果的影響以及輸入地震動隨機性對場地地震動參數(shù)的影響,并針對工程中出現(xiàn)的相關問題提出了合理建議。
[Abstract]:A large number of earthquake damage survey, strong motion observation data and theoretical results show that the site conditions have a significant impact on the amplitude characteristics and frequency spectrum characteristics of ground motion, and then directly affect the degree of earthquake damage of construction projects. Therefore, according to the site conditions of site seismic response analysis, the determination of reasonable and reliable site ground motion parameters becomes the key technical issues of seismic zoning, seismic safety evaluation of engineering sites and seismic analysis of engineering structures. Site seismic response analysis involves parameters of ground motion input from bedrock under soil layer, dynamic model of soil layer and calculation method of seismic response of soil layer. At the same time, it also contains many uncertain factors that affect the final site motion parameters. The uncertainty of seismic parameters will ultimately affect the rationality and safety of engineering seismic fortification requirements. In view of the above problems, based on the traditional theory of ground motion synthesis and site seismic response analysis, some basic problems existing in the application of site seismic response analysis to engineering practice are studied in this paper. The synthetic method of ground motion and the calculation method of site seismic response are proposed to meet the engineering requirements. The influence of the uncertainty of input ground motion on the ground motion parameters is analyzed. The main works are as follows: 1. The traditional method of ground motion synthesis based on trigonometric series superposition method is studied. Based on this method, a method of ground motion synthesis is proposed to fit the target response spectrum of encrypted control points. The number of encrypted control points is consistent with the number of frequency points of Fourier transform. In this paper, the baseline drift problem of synthetic ground motion time history is also considered. Based on this, a time-domain baseline correction method with pulse function and a frequency-domain baseline correction method with Fourier amplitude adjustment are proposed. 2, based on the frequency-domain fluctuation principle, A one-dimensional equivalent linearization site seismic response calculation program SSRC11.exe, is developed and the applicability of forward and inverse calculation of the program is studied through actual site data and array observation records. 3. Method of formation and calculation of site response, Through the establishment of site model, the related problems of inversion analysis based on equivalent linearization method are considered. The method of determining the reasonable input ground motion of a major engineering structure considering the interaction of soil junctions is studied. 4. The influence of the randomness of the input ground motion on the ground motion parameters under different site conditions and different input ground motion intensities is analyzed. At the same time, the paper evaluates whether the number of earthquake motion input applied in the seismic safety evaluation of major engineering sites can give the stable statistical value of ground motion parameters, so as to reasonably determine the number of input bedrock ground motion samples. Therefore, reasonable and reliable site seismic response calculation results provide theoretical basis. In this paper, not only the synthesis of ground motion and the theoretical study of site seismic response analysis method are carried out, but also based on the practical application of seismic engineering, The influence of the spectral components of synthetic ground motion on the inversion results and the effect of the randomness of the input ground motion on the ground motion parameters are analyzed, and some reasonable suggestions are put forward for the related problems in the engineering.
【學位授予單位】：中國地震局地球物理研究所
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU435

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