基础隔震结构基于能量的一体化实用设计方法研究

发布时间：2018-08-22 12:11

【摘要】：经过多年的理论研究与工程实践,隔震技术因其优良的耗能特性已经被广泛地应用在工程领域。在隔震技术应用研究日趋完善的同时,隔震结构的设计方法也日趋规范化,美国、日本、新西兰、意大利和中国等国家相继颁布了建筑隔震设计规程。但隔震结构设计方法在实际运用中仍然存在一定问题,合理且高效的隔震结构设计方法依然是隔震技术应用研究的热点。本文以包含力与位移两个指标的能量为结构设计的重要参数,以添加天然橡胶支座和铅芯橡胶支座的基础隔震结构设计为核心,从利用MATLAB软件和SAP2000软件的基础隔震结构的能量反应预测方法、基础隔震结构的附加阻尼比计算、隔震层的设计三个方面进行了一系列的相关研究。主要研究成果如下：(1)基础隔震结构的能量反应预测分析。在分析传统抗震结构和基础隔震结构的能量反应方程的基础上,通过对传统抗震结构的能量反应影响因素进行分析,对基础隔震结构的能量反应影响因素进行了对比总结,提出了基础隔震结构能量(尤其是地震动输入能)的估计方法,并与利用SAP2000分析的结构结果进行对比,证明了该预测方法可以得到较为合理的结果。(2)基础隔震结构的附加阻尼比计算。在分析规范所提出的减震结构的附加阻尼比公式的基础上,提出了基于能量的基础隔震的附加阻尼比计算公式。分析了上部结构总应变能、隔震层耗能、上部结构最大位移和隔震层最大位移四个基础隔震结构附加阻尼比的主要影响因素,提出了四个主要影响因素的确定方法,以及其误差对附加阻尼比的影响。通过对比基础隔震结构附加阻尼比估算结果以及SAP2000分析结果,验证了该方法对基础隔震结构的附加阻尼比的估算是安全可靠的,可以作为隔震结构一体化设计中结构附加阻尼比的计算方法,实现了隔震结构的一体化设计。(3)基础隔震结构隔震层的设计。首先介绍了铅芯支座在地震作用下的耗能公式,对支座选型的影响因素,包括支座的型号、支座的耗能以及隔震层的耗能进行了分析总结；进而归纳了支座的选型步骤；最后总结出了以位移为指标的对支座布置方案的初步筛选和基础隔震结构的反应谱验证方法,通过与分部设计方法设计的隔震结构计算结果对比,验证了该方法对基础隔震结构隔震层的设计是合理和高效的。(4)基于能量设计方法的基础隔震结构实例分析。分别利用分部设计方法和本文所研究的基于能量的设计方法对某中学科技楼进行了完整的隔震设计,并对采用两种方法设计的基础隔震结构的规范规定指标和隔震层布置方案进行了对比分析,证明了本文所提出的基于能量基础隔震结构一体化设计方法的实用性、有效性和可靠性。
[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.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU352.12

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