预压装配式预应力混凝土框架结构在地震作用下的连续倒塌可靠度概率分析

发布时间：2018-05-08 20:41

本文选题：连续倒塌 + 预压装配式框架结构　；参考：《合肥工业大学》2017年硕士论文

【摘要】：1968年英国的Ronan Point公寓倒塌事故使得建筑结构的连续倒塌问题开始受到工程界的重视,在这之后经过了数十年的研究取得了众多的研究成果,同时提出了适用于连续倒塌问题的分析方法和设计方面的建议,并且编制出相关的设计规程。但是对于目前广泛推广的装配式结构的抗连续倒塌问题的研究则较少。本文以预压装配式预应力混凝土框架结构为对象,以可靠度分析方法为手段,研究其在地震作用下的抗连续倒塌性能。预压装配式预应力混凝土框架结构通过改进装配式结构的节点受力性能,改善了结构的抗震能力,使得其在地震区能够得以应用。因此,以预压装配式预应力混凝土框架结构为对象进行研究,对于推广其在地震区的应用具有一定的意义。本文主要的研究内容如下:(1)设计建立了本文所研究的预压装配式预应力混凝土框架结构模型,采用Midas/Gen平台进行确定性分析为后文的不确定性分析提供基础。采用非线性动力拆除构件法,研究不同部位构件发生初始破坏后结构的动力反应;采用Pushover分析方法,研究完好结构和发生初始破坏后的损伤结构抗水平地震的能力。(2)采用基于构件可靠度的分析方法,对完好结构在地震作用下结构最可能发生失效的构件进行识别。本文将基于拉丁超立方体抽样的确定性抽样方法,作为所研究样本的生成方法,结合Pushover分析方法对构件的抗震能力进行分析,最终得到构件在地震作用下的构件可靠度。对比各构件的分析结果后,得到地震作用下结构最可能发生失效的构件。(3)采用随机Pushdown分析方法,分别对完好结构和拆除最可能失效构件后的损伤结构进行整体可靠度分析,在不考虑地震作用的前提下得到完好结构及损伤结构的的连续倒塌可靠度,对损伤结构进行连续倒塌易损性分析并通过灵敏度分析寻找对结构抗竖向连续倒塌影响较大的因素。通过场地的地震危险性分析,得到地震作用发生的概率。基于计算偶然作用下结构发生连续倒塌概率的全概率公式,综合构件可靠度分析、条件可靠度分析和场地危险性分析得到的结果,最终得到地震作用下结构整体发生连续倒塌的失效概率,并对结构在地震作用下的抗竖向连续倒塌鲁棒性进行评价分析。根据最终得到的结果可知,本文所建立的预压装配式预应力混凝土框架结构,在地震作用下发生连续倒塌的概率较小,具有较好的鲁棒性。
[Abstract]:The collapse of Ronan Point apartment in Britain in 1968 made the continuous collapse of building structure begin to be paid attention to by the engineering circles. After decades of research, many research results have been obtained. At the same time, the analysis methods and design suggestions for continuous collapse problems are put forward, and relevant design rules are worked out. However, there are few studies on the continuous collapse resistance of fabricated structures which are widely popularized at present. In this paper, preloading prefabricated prestressed concrete frame structure is taken as an object and reliability analysis method is used to study its continuous collapse resistance under earthquake action. The preloading prefabricated prestressed concrete frame structure can improve the seismic capacity of the prefabricated prestressed concrete frame structure by improving the behavior of the joints of the prefabricated structure, and it can be applied in the earthquake area. Therefore, the study of preloaded prefabricated prestressed concrete frame structure is of great significance for its application in earthquake area. The main contents of this paper are as follows: (1) the model of preloaded prestressed concrete frame structure studied in this paper is designed and established. The deterministic analysis based on Midas/Gen platform is used to provide the basis for the uncertainty analysis later. The dynamic response of structures after initial failure of members in different parts is studied by means of nonlinear dynamic demolition method, and the Pushover analysis method is used. This paper studies the ability of intact structure and damaged structure after initial failure to resist horizontal earthquake. The method based on component reliability is used to identify the components that are most likely to fail under earthquake. In this paper, the deterministic sampling method based on Latin hypercube sampling is used as the generating method of the studied samples, and the seismic capacity of the components is analyzed with the Pushover analysis method. Finally, the reliability of the components under earthquake action is obtained. After comparing the analysis results of each component, it is obtained that the component that is most likely to fail under earthquake action. The random Pushdown analysis method is used to analyze the overall reliability of the intact structure and the damaged structure after removing the most likely failure member. The reliability of continuous collapse of intact structures and damaged structures is obtained without considering earthquake action. The vulnerability of damaged structures to continuous collapse is analyzed and the factors that have a great influence on the vertical continuous collapse resistance of structures are found through sensitivity analysis. Through the seismic hazard analysis of the site, the probability of earthquake action is obtained. Based on the full probability formula for calculating the probability of continuous collapse of structures under accidental action, the results obtained from reliability analysis of composite components, conditional reliability analysis and site hazard analysis, Finally, the failure probability of continuous collapse of the whole structure under earthquake action is obtained, and the robustness of the structure against vertical continuous collapse is evaluated and analyzed. According to the final results, the probability of continuous collapse of the preloaded prefabricated prestressed concrete frame structure established in this paper is small and has good robustness.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU378.4

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