基礎(chǔ)隔震結(jié)構(gòu)基于能量的一體化實(shí)用設(shè)計(jì)方法研究
[Abstract]:After many years of theoretical research and engineering practice, seismic isolation technology has been widely used in engineering field because of its excellent energy dissipation characteristics. At the same time, the design method of isolation structure is becoming more and more standardized. The United States, Japan, New Zealand, Italy and China have promulgated the building isolation design rules one after another. However, there are still some problems in the practical application of the design method of isolation structure, and the reasonable and efficient design method of isolated structure is still a hot spot in the application of isolation technology. In this paper, the energy including force and displacement is taken as the important parameter of structure design, and the base isolation structure design of natural rubber bearing and lead rubber bearing is added as the core. A series of related studies are carried out from three aspects: the energy response prediction method of base-isolated structure based on MATLAB and SAP2000 software, the calculation of additional damping ratio of base-isolated structure, and the design of isolation layer. The main research results are as follows: (1) the energy response prediction analysis of base isolated structure. Based on the analysis of the energy response equations of the traditional seismic structure and the base-isolated structure, the factors affecting the energy response of the traditional aseismic structure are analyzed, and the factors affecting the energy response of the base-isolated structure are compared and summarized. A method for estimating the energy of base-isolated structures, especially the input energy of ground motion, is proposed and compared with the results obtained by SAP2000 analysis. It is proved that the prediction method can get more reasonable results. (2) the additional damping ratio of base-isolated structures is calculated. On the basis of the analysis of the additional damping ratio formula of shock absorption structures proposed in the code, the formula for calculating the additional damping ratio of foundation isolation based on energy is put forward. The main influencing factors of total strain energy, energy dissipation of isolation layer, maximum displacement of superstructure and maximum displacement of isolation layer are analyzed. And the effect of its error on the additional damping ratio. By comparing the estimation results of additional damping ratio of base-isolated structures and the results of SAP2000 analysis, it is proved that the method is safe and reliable for estimating the additional damping ratios of base-isolated structures. It can be used as the calculation method of the additional damping ratio of the structure in the integrated design of the isolated structure. (3) the design of the isolation layer of the base-isolated structure. This paper introduces the formula of energy consumption of lead bearing under earthquake, analyzes and summarizes the factors influencing the type selection of bearing, including the type of bearing, the energy consumption of bearing and the energy consumption of isolation layer, and then summarizes the selection steps of bearing. Finally, the paper summarizes the preliminary screening of the support arrangement scheme based on displacement and the verification method of the response spectrum of the base-isolated structure. The results are compared with the calculated results of the isolated structure designed by the divisional design method. It is verified that this method is reasonable and efficient for the design of isolation layer of base-isolated structure. (4) an example of base-isolated structure based on energy design method is analyzed. Using the divisional design method and the energy-based design method studied in this paper, the complete seismic isolation design of a middle school science and technology building is carried out. The comparison and analysis of the specification index and the layout scheme of the base-isolated structure designed by two methods have proved the practicability of the integrative design method based on the energy base seismic isolation structure in this paper. Validity and reliability.
【學(xué)位授予單位】:東南大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TU352.12
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