设防砌体结构易损性模型相关参数修正

发布时间：2018-07-05 20:06

本文选题：设防砌体结构 + 易损性分析的确定性方法　；参考：《中国地震局工程力学研究所》2017年硕士论文

【摘要】：砌体结构在我国有着悠久的历史,广泛应用于民用住宅、办公楼、教学楼以及工厂等建筑结构中,在不同烈度区都有大量的分布,这使得不同烈度区砌体结构抗震能力的研究变得尤为重要。在1976年唐山地震后,圈梁构造柱体系对于砌体结构抗震性能的提升受到专家学者的广泛关注,随着几版抗震规范的修订完善,对于构造措施的布置逐渐强化,设防砌体结构整体性与抗震能力大幅度提升,由于当前采用的砌体结构震害预测方法大多基于六七十年代唐山海城等地震的震害数据,未充分考虑构造措施的影响,已经不能准确描述当前设防砌体结构的震害预测结果,需要进行参数修正,提高准确性。本文选取震例,采用易损性分析的确定性方法进行设防砌体结构的易损性分析,与实际震害对比后发现结果差距较大。因此本文根据89版本、01版本与10版本规范对构造措施的布置设计工况,采用有限元软件对实际结构进行建模和时程分析,最后通过数据模拟得到的数据对易损性分析的确定性方法进行参数修正,得到修正矩阵,提高震害预测的精度。首先,本文对国内在存在的震害预测方法进行介绍,分析其优劣特点,考虑到本文的研究对象是砌体结构,最后选取尹之潜研究员提出的易损性分析的确定性分析方法为理论基础,并且主要介绍了此方法的理论依据和流程,阐述了抗力指标的计算过程与意义,并且详细介绍了静态与动态震害矩阵以及尹之潜方法与震害预测的关系,为后续的构造柱修正系数的推演提供了理论基础。其次,本文介绍了我国砌体结构的发展史、结构特点以及在典型震害,重点介绍了设防砌体的概念与组成以及砌体结构合理的破坏模式,并且初步确定结构单层构造柱的数量与实际的震害指数间存在一种函数关系,为接下来的分析做铺垫。最后,选取在汶川地震中有典型震害的漩口中学教师宿舍作为建模原型,依据89、01和10三版抗震规范对构造措施的要求来设计工况,进行有限元建模。在得到结构层间位移角最大值后,将层间位移角与震害指数挂钩,结合修正前的易损性分析结果与公式反推得到不同层数,不同构造柱布置下的构造柱修正系数公式,对原方法的参数进行补充完善,并且选取震例对新增的构造柱修正系数进行验算。
[Abstract]:Masonry structures have a long history in China. They are widely used in civil residential buildings, office buildings, teaching buildings and factories, and are widely distributed in different intensity areas. This makes the study of seismic capacity of masonry structures in different intensity areas become particularly important. After the Tangshan earthquake of 1976, the improvement of seismic performance of the ring beam structure column system for masonry structure has received extensive attention of experts and scholars. With the revision and perfection of several edition seismic code, the arrangement of structural measures is gradually strengthened. The integrity and seismic capacity of masonry structures have been greatly improved. Because the current prediction methods of masonry structures' earthquake damage are mostly based on the earthquake disaster data of Tangshan Haicheng in the 1960s and 1970s, the influence of structural measures has not been fully considered. The prediction results of earthquake damage of masonry structures with fortification can not be accurately described, and the parameters should be revised to improve the accuracy. In this paper, the vulnerability analysis of masonry structures is carried out by using the deterministic method of vulnerability analysis, and it is found that there is a big gap between the results compared with the actual earthquake damage. Therefore, according to the layout and design conditions of the structural measures in the 89 and 10 versions, the finite element software is used to model and analyze the actual structure. Finally, the deterministic method of vulnerability analysis is modified by the data obtained by data simulation, and the modified matrix is obtained to improve the accuracy of earthquake damage prediction. First of all, this paper introduces the existing earthquake disaster prediction methods in China, analyzes its advantages and disadvantages, considering that the research object of this paper is masonry structure, Finally, the deterministic analysis method of vulnerability analysis proposed by Yin Zhiqian is selected as the theoretical basis, and the theoretical basis and process of this method are mainly introduced, and the calculation process and significance of resistance index are expounded. The relationship between static and dynamic damage matrix and Yin Zhiqian method and earthquake disaster prediction is introduced in detail, which provides a theoretical basis for the deduction of structural column correction coefficient. Secondly, this paper introduces the history, characteristics and typical earthquake damage of masonry structure in our country, especially introduces the concept and composition of fortification masonry and the reasonable failure mode of masonry structure. It is determined that there is a functional relationship between the number of single-layer structural columns and the actual earthquake damage index, which will pave the way for the next analysis. Finally, the teachers' dormitory of Waikou Middle School, which has typical earthquake damage in Wenchuan earthquake, is selected as the modeling prototype. According to the requirements of the structural measures of the 89Y and 103rd edition seismic code, the finite element modeling is carried out. After obtaining the maximum displacement angle of the structure, the interstory displacement angle is linked to the earthquake damage index, and the formula of the correction coefficient of the column under different layers and different structural columns is obtained by combining the results and formulas of vulnerability analysis before the correction. The parameters of the original method are supplemented and perfected, and the newly added structural column correction coefficient is checked and calculated by selecting an earthquake example.
【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU364;TU352.11

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