基于汶川地震記錄的遠場長周期地震動設(shè)計反應(yīng)譜研究
[Abstract]:Reasonable input of long period ground motion is very important for seismic design of long period structure. In Japan, great achievements have been made in the study of long-period earthquake input, and good practice has been obtained in the engineering design. The earthquake environment and anti-seismic fortification in China are different from Japan, so it is not possible to copy the Japanese research results. At present, the domestic research on the input problem of long-period ground motion is far from meeting the requirement of engineering practice. There are many disputes about the setting and adjustment of the long-period section of the code design spectrum. Obviously, for different types of ground motion, The design of the long period response spectrum should be different. Based on the Wenchuan earthquake records, the design response spectra of conventional and far-field long-period ground motions are studied. The main work of the study is as follows: (1) the baseline correction and filtering of the collected Wenchuan records are carried out, and the acceleration of each seismic record is calculated. Velocity response spectrum and related seismic parameters. (2) calculation and statistical analysis of multiple spectral parameters of all seismic records, combined with epicentral distance and peak velocity, (3) in order to perfect the seismic input of long-period structure, the conventional seismic design response spectrum, which is compared with the design spectrum of far-field long-period ground motion, is formed. Genetic algorithm is used to calibrate the design parameters. (4) the velocity design spectrum fitting analysis and the calibration calculation of the design parameters are carried out for the selected far-field long-period ground motion, and the pseudospectral relationship is used. The corresponding design spectrum of long-period ground motion acceleration is obtained. Through the above research, the following conclusions and results are obtained: (1) the average period Tavg of acceleration response spectrum is suitable for evaluating the spectral characteristics of ground motion. In this paper, Tavg, epicentral distance and peak velocity are selected as the defining indexes of long-period far-field ground motions. (2) A new conventional seismic response spectrum is obtained by fitting. At the same time, some suggestions of fitting design spectrum parameters under different design conditions are given; (3) response spectrum fitting with genetic algorithm can get good fitting effect; (4) long period seismic velocity design spectrum, which is in line with the seismic design method of our country, is obtained by fitting. The corresponding acceleration design spectrum is obtained by pseudospectral relation. Compared with the code, the design spectrum obtained in this paper can better reflect the characteristics of the response spectrum of the long-period ground motion.
【學位授予單位】:重慶大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TU352.11
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