基于等效线性化的场地地震反应分析基本问题研究
发布时间：2018-10-21 14:40
【摘要】：大量震害调查、强震动观测数据以及理论研究结果表明,场地条件对地震动的幅值特性及频谱特性有着显著影响,进而直接影响着建设工程的震害程度。因此,根据场地条件进行场地地震反应分析,确定合理、可靠的场地地震动参数就成为地震区划、工程场地地震安全性评价以及工程结构抗震分析的关键技术问题。场地地震反应分析涉及土层下卧基岩输入地震动参数、土层介质动力模型及土层地震反应计算方法等问题,各个问题之间相互影响、相互联系,同时这其中也蕴含着影响最终场地地震动参数的诸多不确定因素。地震动参数的不确定性将最终影响工程抗震设防要求确定的合理性与安全性。鉴于以上问题,本文在传统地震动合成及场地地震反应分析理论的基础上,对场地地震反应分析应用于工程实际所存在的部分基本问题展开研究,提出了能够满足工程要求的地震动合成方法及场地地震反应计算方法,并分析了输入地震动的不确定性对场地地震动参数的影响,具体工作如下:1、研究了基于三角级数叠加法的传统地震动合成方法,并以此为基础,提出了一种拟合加密控制点目标反应谱的地震动合成方法,其中加密后的控制点个数与进行傅里叶变换的频率点个数相一致。本文方法还考虑了合成地震动时程存在的基线飘移问题,并在此基础上提出了加入脉冲函数的时域基线校正方法以及傅里叶幅值调整的频域基线校正方法;2、基于频域波动原理,编制了一维等效线性化场地地震反应计算程序SSRC11.exe,并通过实际场地资料及台阵观测记录对该程序进行正演与反演计算的适用性进行研究;3、根据本文提出的地震动合成方法以及场地反应计算方法,通过建立场地模型,考虑了基于等效线性化方法进行反演分析存在的相关问题,并研究了考虑土结相互作用的重大工程结构的合理输入地震动的确定方法;4、分析了输入地震动的随机性在不同场地条件、不同输入地震动强度下对场地地震动参数的影响程度,同时,对目前重大工程场地地震安全性评价应用的地震动输入数量是否能够给出场地地震动参数稳定的统计值进行了评价,为合理地确定输入基岩地震动样本数量,进而得到合理、可靠的场地地震反应计算结果提供理论依据。本文不仅开展了地震动的合成以及场地地震反应分析方法的理论研究,还基于实际的地震工程应用,分析了合成地震动频谱成分对反演结果的影响以及输入地震动随机性对场地地震动参数的影响,并针对工程中出现的相关问题提出了合理建议。
[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.
【学位授予单位】：中国地震局地球物理研究所
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU435
本文编号：2285407
[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.
【学位授予单位】：中国地震局地球物理研究所
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU435
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