【作者】 马勇；

【导师】 黄慎江；

【作者基本信息】 合肥工业大学 ， 结构工程， 2017， 硕士

【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。更多还原

【Abstract】 In 1968,the collapse of the Ronan Point apartment in the United Kingdom caused the progressive collapse of the building structure to be paid attention to by the engineering community.After several decades of research,a number of research results have been made,and an analysis has been put forward for the problem of progressive collapse methods and design recommendations,and the preparation of the relevant design procedures.However,there is little research on the progressive collapse problem of the widely popular assembly structure.In this paper,the prestressed concrete frame structure is used as the object,and the reliability analysis method is used as the means to study the progressive collapse performance under earthquake action.The prestressed assembled concrete frame structure improves the seismic capacity of the structure by improving the force performance of the assembled structure,so that it can be applied in the earthquake area.Therefore,it is of great significance to promote the application of prestressed assembled concrete frame structure in the earthquake area.The main contents of this paper are as follows:(1)The prestressed prefabricated concrete frame structure model was established and the deterministic analysis using Midas / Gen platform was used to provide the basis for the subsequent uncertainty analysis.The dynamic response of the structure after the initial failure of the different parts is studied by using the nonlinear dynamic demolition component method.The POA method is used to study the ability of the well structure and the damage structure to damage the earthquake after the initial failure.(2)Based on the analysis method of component reliability,the members whose structures are most likely to fail under the action of earthquake are identified.In this paper,a deterministic sampling method based on Latin hypercube sampling is used as the method of generating samples.By using the Pushover analysis method,the seismic capacity of the members is analyzed,and the seismic requirements of the members are obtained.Finally,the structural reliability of the members under earthquake is obtained.After comparing the results of the analysis of the components,the structures that are most likely to fail under the action of the earthquake are obtained.(3)The stochastic Pushdown analysis method is used to analyze the damage structure of the damage structure after the perfect structure and the most likely failure member,and the continuous collapse reliability of the structure and damage structure is obtainedwithout considering the earthquake action.The damage analysis of the damage structure is analyzed and the factors influencing the vertical collapse of the structure are studied by the sensitivity analysis.Through the seismic hazard analysis of the site,the probability of occurrence of seismic action is obtained.Based on the calculation of the probability of continuous collapse under the action of accidental load,the reliability analysis of the composite component,the conditional reliability analysis and the analysis of the site risk analysis,the failure probability of the whole structure under the earthquake is obtained.The seismic robustness of the structure is evaluated and analyzed.According to the results obtained,the preloading prestressed concrete frame structure established in this paper has a small probability of continuous collapse under the action of earthquake,and has good robustness.更多还原