本文選題：多層鋼筋混凝土框架結構 + 關鍵構件　； 參考：《西南交通大學》2014年碩士論文

【摘要】：本文以按我國規(guī)范設計的一棟平面布置規(guī)則的多層鋼筋混凝土框架結構為算例,運用改進的線性動力拆除構件法和非線性靜力pushover法對其連續(xù)性倒塌受力機制及連續(xù)性倒塌抗力機制進行了研究,并在此基礎上介紹了結構防連續(xù)性倒塌的控制設計法,主要研究工作和成果如下： (1)多層鋼筋混凝土框架結構關鍵構件的確定。關鍵構件的選取是結構防連續(xù)性倒塌機制分析和防連續(xù)倒塌設計的首要步驟�；诮Y構極限承載能力的概念,將構件拆除前后整體結構的極限承載能力的變化率定義為構件敏感性系數(shù),提出了構件敏感性系數(shù)的計算方法。本文分別以平面框架和空間框架作為算例模型,將敏感性分析方法這一理論應用于算例中,驗證了敏感性分析方法在平面框架和空間框架結構中的適用性,并通過計算得到了代表性構件的敏感性系數(shù),為后續(xù)分析做好鋪墊。 (2)針對按我國規(guī)范設計的多層鋼筋混凝土框架結構,運用線性動力拆除構件法對其防連續(xù)性倒塌受力機制進行了研究。以往的結構防連續(xù)性倒塌動力分析時通常將結構的初始狀態(tài)視為零應力,零位移狀態(tài),未考慮結構在未拆除構件前的靜力平衡狀態(tài),顯然這和實際情況是不符的。本文分析時,將結構的初始靜力平衡狀態(tài)考慮在內,改進了動力分析方法的加載方案,使得結果更加符合實際情況。通過改進后的線性動力拆除構件法,得到了結構在典型部位拆除后的動力響應以及穩(wěn)態(tài)響應,通過同一層和不同樓層之間的對比,總結了結構防連續(xù)倒塌的內在受力機制及連續(xù)性倒塌的規(guī)律,為研究防連續(xù)性倒塌設計方法提供依據(jù)。 (3)采用非線性靜力增量Pushover法,研究了按我國規(guī)范設計的典型RC框架結構的防連續(xù)倒塌抗力分布規(guī)律。基于結構關鍵構件的失效風險評估和關鍵構件的敏感性系數(shù),提出了絕對倒塌概率的指標。同時,基于非線性靜力增量法分析得到的局部區(qū)域豎向承載力全抗力曲線,提出了構件失效局部承載力儲備的指標。前者從整體結構的角度評價結構發(fā)生連續(xù)性倒塌的可能性,后者從結構局部的的角度評價結構發(fā)生連續(xù)性倒塌的可能性。建議采用兩個指標來綜合評價結構的防連續(xù)性倒塌性能,給出了具體的評價方法,并對文中算例進行了評價。計算結果表明,角柱失效后結構易發(fā)生連續(xù)性倒塌,其次是邊柱和中柱。這和線性動力分析時得到的結論吻合,為進一步研究防連續(xù)性倒塌設計方法提供依據(jù)。 (4)提出了結構連續(xù)性倒塌控制設計方法,并給出了該方法的具體流程。該方法包括軸壓比評估法、簡單評估法、詳細評估法三個階段,每一種方法的內容都是基于本文前幾章的分析成果,通過循序漸進的方式對結構防連續(xù)倒塌設計提出了具體要求。
[Abstract]:In this paper, a multi-story reinforced concrete frame structure, which is designed according to the code of our country, is used as an example. The continuous collapse mechanism and the continuous collapse resistance mechanism are studied by using the improved linear dynamic demolition method and the nonlinear static pushover method. On the basis of this, the control design method for preventing the continuous collapse of the structure is introduced. The main research work and results are as follows: 1) determination of key members of multi-story reinforced concrete frame structure. The selection of key components is the first step to analyze the mechanism of continuous collapse and design of continuous collapse. Based on the concept of ultimate bearing capacity of structure, the change rate of ultimate bearing capacity of the whole structure before and after demolition is defined as the sensitivity coefficient of the member, and the calculation method of the sensitivity coefficient of the component is put forward. In this paper, the theory of sensitivity analysis is applied to the example of plane frame and spatial frame respectively, and the applicability of sensitivity analysis method in plane frame and spatial frame structure is verified. The sensitivity coefficient of representative components is obtained by calculation, which lays the groundwork for further analysis. 2) aiming at the multi-story reinforced concrete frame structure designed according to the code of our country, the mechanism of preventing continuous collapse is studied by means of linear dynamic demolition method. In the past, the initial state of the structure is usually regarded as zero stress and zero displacement state, and the static equilibrium state of the structure before the removal of the member is not considered, which is obviously not in accordance with the actual situation. In this paper, the initial static equilibrium state of the structure is taken into account, and the loading scheme of the dynamic analysis method is improved, which makes the results more in line with the actual situation. Through the improved linear dynamic removal method, the dynamic response and the steady response of the structure after the removal of typical parts are obtained, and the comparison between the same floor and different floors is carried out. The internal force mechanism and the law of continuous collapse of structures are summarized, which provides a basis for the study of the design method of continuous collapse prevention. In this paper, the nonlinear static incremental Pushover method is used to study the distribution of continuous collapse resistance of typical RC frame structures designed according to the code of our country. Based on the failure risk assessment of key structural components and the sensitivity coefficient of key components, an index of absolute collapse probability is proposed. At the same time, based on the total resistance curve of local vertical bearing capacity obtained by nonlinear static increment method, the index of local bearing capacity reserve for failure of members is proposed. The former evaluates the possibility of the continuous collapse of the structure from the viewpoint of the whole structure, and the latter evaluates the possibility of the continuous collapse of the structure from the point of view of the local structure. It is suggested that two indexes be used to synthetically evaluate the anti-collapse performance of the structure, and a concrete evaluation method is given, and an example is given. The calculated results show that continuous collapse of the structure occurs easily after the failure of the corner column, followed by the edge column and the middle column. This is consistent with the conclusion of linear dynamic analysis, which provides a basis for further study on the design method of continuous collapse prevention. 4) the design method of continuous collapse control is proposed, and the concrete flow of this method is given. This method includes three stages: axial compression ratio evaluation method, simple evaluation method and detailed evaluation method. The contents of each method are based on the analysis results of the previous chapters of this paper. The concrete requirements for the continuous collapse prevention design of the structure are put forward in a step-by-step manner.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU312;TU375.4

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