本文選題：鋼框架　切入點：連續(xù)倒塌　出處：《西安工業(yè)大學》2017年碩士論文

【摘要】：隨著我國經(jīng)濟的高速發(fā)展,對建筑結(jié)構也提出了更高的要求,其中鋼結(jié)構被廣泛的應用在大跨度及高層建筑中。結(jié)構構件在遭受偶然荷載破壞后,往往會導致結(jié)構整體發(fā)生倒塌,結(jié)構一旦發(fā)生倒塌,就會造成極其嚴重的后果,加之近些年來恐怖襲擊頻發(fā),公共基礎建筑已經(jīng)成為恐怖襲擊的首要目標,所以鋼框架結(jié)構抗連續(xù)倒塌性能分析具有重要的理論意義和工程價值。本文介紹了英美歐三種規(guī)范指南,并對其中的荷載組合與判斷準則進行對比,結(jié)合我國的有關規(guī)范,利用SAP2000有限元軟件構建了 9層6×5跨鋼框架模型,采用備用荷載路徑法(簡稱APM法),分別對空間鋼框架結(jié)構以及空間鋼框架結(jié)構中選取的一榀豎向鋼框架結(jié)構進行靜力分析和動力分析,最后將豎向平面鋼框架結(jié)構和空間鋼框架結(jié)構分析結(jié)果進行對比,得出以下結(jié)論:(1)在豎向平面鋼框架結(jié)構線性靜力分析中,去除中柱工況受損跨梁構件首先在底層出現(xiàn)破壞,去除邊柱工況受損跨梁構首先在二層出現(xiàn)破壞,且其余梁構件破壞順序無明顯規(guī)律。(2)空間鋼框架結(jié)構和豎向平面鋼框架結(jié)構在進行靜力分析需要考慮動力放大系數(shù)α,而動力放大系數(shù)α受初始荷載組合大小以及拆除工況的影響。(3)受損跨Pushdown分析中,結(jié)合構件塑性鉸出現(xiàn)發(fā)展順序,空間鋼框架結(jié)構發(fā)生倒塌首先破壞的構件可以是受損跨的梁構件或柱構件,豎向平面鋼框架結(jié)構發(fā)生倒塌首先破壞的構件是受損跨的梁構件。(4)非線性動力分析使用考慮結(jié)構初始狀態(tài)的等效荷載瞬時加載法,豎向平面鋼框架結(jié)構大于空間鋼框架結(jié)構拆除柱子后剩余結(jié)構的動力效應。改變瞬時加載時間,豎向平面鋼框架結(jié)構和空間鋼結(jié)構的動力效應都會受到影響,且豎向平面鋼框架結(jié)構受到的影響更大。(5)比較豎向平面鋼框架結(jié)構和空間鋼框架結(jié)構的非線性靜力分析與非線性動力分析,兩種結(jié)構在拆除柱子后的內(nèi)力重分布的路徑是相同的,但空間鋼框架結(jié)構的內(nèi)力重分布路徑更多。
[Abstract]:With the rapid development of economy in our country, higher requirements have been put forward to the building structure, in which steel structure has been widely used in long-span and high-rise buildings.After the structural members are damaged by accidental loads, they often lead to the collapse of the whole structure. Once the structure collapses, it will cause extremely serious consequences. In addition, in recent years, the terrorist attacks occur frequently.Public foundation building has become the primary target of terrorist attack, so the analysis of continuous collapse resistance of steel frame structure has important theoretical significance and engineering value.This paper introduces three kinds of code guides in Anglo-American and European countries, and compares the load combination and judgment criteria among them. Combined with the relevant codes of our country, a 9-story 6 脳 5 span steel frame model is constructed by using SAP2000 finite element software.The static and dynamic analysis of spatial steel frame structure and one vertical steel frame structure selected in space steel frame structure are carried out by the method of standby load path (APM).Finally, the analysis results of vertical plane steel frame structure and spatial steel frame structure are compared, and the following conclusion is drawn: in the linear static analysis of vertical plane steel frame structure, the first failure of the damaged span beam member in the middle column condition occurs at the bottom.The damage to the cross beam structure under the condition of removing the side column is first destroyed on the second floor.Moreover, the failure sequence of other beam members is not obvious. 2) the dynamic magnification factor 偽 is considered in the static analysis of spatial steel frame structure and vertical plane steel frame structure, while the dynamic magnification factor 偽 is subjected to the initial load combination size, and the dynamic magnification factor 偽 is considered in the static analysis of the vertical plane steel frame structure.In Pushdown analysis of damage span,Combined with the development sequence of plastic hinge of the member, the first failure member of the spatial steel frame structure may be the beam member or column member with damaged span.Nonlinear dynamic analysis of beam member with damaged span when the vertical plane steel frame structure collapses first, the equivalent load instantaneous loading method considering the initial state of the structure is used in the nonlinear dynamic analysis.The dynamic effect of vertical plane steel frame structure is greater than that of space steel frame structure after the column is removed.The dynamic effect of vertical plane steel frame structure and space steel structure will be affected by changing the instantaneous loading time.And the vertical plane steel frame structure is more affected than the vertical plane steel frame structure and the spatial steel frame structure, the nonlinear static analysis and the nonlinear dynamic analysis are compared between the vertical plane steel frame structure and the spatial steel frame structure.The internal force redistribution paths of the two structures after removing the columns are the same, but the internal force redistribution paths of the spatial steel frame structures are more than those of the spatial steel frame structures.
【學位授予單位】：西安工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU391

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