本文關(guān)鍵詞： 鋼框架結(jié)構(gòu) 連續(xù)倒塌 非線性動力分析 拆除構(gòu)件法 爆炸載荷　出處：《山東建筑大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著中國土木工程行業(yè)的迅猛發(fā)展,鋼結(jié)構(gòu)體系得到了更加廣泛的應(yīng)用。目前工程界對鋼結(jié)構(gòu)建筑在常規(guī)載荷作用下的設(shè)計(jì)已經(jīng)比較完善,而對于各種偶然載荷(如火災(zāi)、汽車撞擊及爆炸等)作用引起的結(jié)構(gòu)連續(xù)倒塌行為還存在許多值得探討的內(nèi)容。眾所周知,結(jié)構(gòu)的連續(xù)性倒塌通常會造成較為嚴(yán)重的后果,對人民的生命財(cái)產(chǎn)安全構(gòu)成重大威脅,故對鋼結(jié)構(gòu)連續(xù)倒塌的分析和研究具有顯著的社會意義。 對鋼結(jié)構(gòu)進(jìn)行連續(xù)倒塌分析時(shí),現(xiàn)在應(yīng)用較為廣泛的兩種分析方法是拆除構(gòu)件法和直接施加偶然載荷法。第一種方法不考慮結(jié)構(gòu)構(gòu)件破壞的具體原因,簡化了結(jié)構(gòu)的分析過程；第二種方法針對不同類型的偶然荷載分別進(jìn)行分析。本文利用有限元軟件ANSYS/LS-DYNA,基于這兩種分析方法,對平面和空間鋼框架結(jié)構(gòu)進(jìn)行非線性動力分析,主要進(jìn)行了一下幾個(gè)方面的研究： (1)基于拆除構(gòu)件法,分析了平面鋼框架結(jié)構(gòu)中柱失效時(shí)間、失效位置及材料的應(yīng)變率對結(jié)構(gòu)動力響應(yīng)的影響,同時(shí)對底層邊柱失效時(shí),結(jié)構(gòu)的內(nèi)力重分布和動力響應(yīng)的影響區(qū)域進(jìn)行分析,得出：構(gòu)件的拆除時(shí)間不應(yīng)大于剩余結(jié)構(gòu)豎向振動周期的1/10；底層邊柱失效引起的結(jié)構(gòu)動力響應(yīng)較大；應(yīng)考慮材料的應(yīng)變率對結(jié)構(gòu)的影響。底層邊柱時(shí),靠近失效柱的各軸柱軸力、各梁彎矩、各梁軸力變化較為顯著,遠(yuǎn)離失效柱的各構(gòu)件內(nèi)力受影響較小。 (2)同樣利用拆除構(gòu)件法對某空間鋼框架結(jié)構(gòu)進(jìn)行連續(xù)倒塌動力分析,由于底層角柱失效和短邊中柱失效引起的動力響應(yīng)較大,所以對底層角柱和短邊中柱失效時(shí),剩余結(jié)構(gòu)的內(nèi)力變化和動力響應(yīng)的影響區(qū)域進(jìn)行研究。 (3)利用直接施加爆炸載荷法,引入失效準(zhǔn)則,將該空間鋼框架結(jié)構(gòu)底層角柱消除,分析柱失效前后剩余各構(gòu)件的內(nèi)力變化情況和動力響應(yīng)的影響區(qū)域。 (4)對比利用兩種方法分析結(jié)構(gòu)底層角柱失效時(shí),結(jié)構(gòu)的位移響應(yīng)、內(nèi)力重分布和動力響應(yīng)的影響區(qū)域有何異同。通過比較得出：撤柱前后,結(jié)構(gòu)中內(nèi)力的變化趨勢基本一致,但拆除構(gòu)件法的模擬結(jié)果偏小。所以,如果結(jié)構(gòu)構(gòu)件失效是由于爆炸載荷作用引起的,應(yīng)利用對結(jié)構(gòu)直接施加爆炸載荷的方法進(jìn)行分析,不建議采用拆除構(gòu)件法對結(jié)構(gòu)進(jìn)行連續(xù)倒塌動力分析。
[Abstract]:With the rapid development of civil engineering industry in China, steel structure system has been applied more widely. The continuous collapse of structures caused by vehicle impact and explosion still has much to be discussed. As we all know, the continuous collapse of structures usually results in serious consequences. It is a great threat to the safety of people's life and property, so it is of great social significance to analyze and study the continuous collapse of steel structures. In the continuous collapse analysis of steel structures, the two widely used analysis methods are the method of removing members and the method of directly applying accidental load. The first method does not consider the concrete reasons of the failure of structural members. In this paper, the nonlinear dynamic analysis of plane and spatial steel frame structures is carried out based on the finite element software ANSYS- LS-DYNA. Mainly carried out the following aspects of research:. 1) based on the method of removing members, the effects of failure time, failure position and strain rate of material on the dynamic response of the structure in plane steel frame structure are analyzed. By analyzing the influence area of the internal force redistribution and the dynamic response of the structure, it is concluded that the demolition time of the member should not be greater than 1 / 10 of the vertical vibration period of the residual structure, and the dynamic response of the structure caused by the failure of the bottom side column is larger. The influence of strain rate of material on the structure should be considered. When the bottom column is near the failure column, the axial force, bending moment and axial force of each beam are significantly changed, while the internal forces of the members far away from the failure column are less affected. (2) in the same way, the method of removing members is used to analyze the continuous collapse dynamic of a space steel frame structure. Because of the failure of the bottom corner column and the short side column, the dynamic response of the bottom corner column and the short side column is larger, so when the bottom corner column and the short edge column fail, The influence area of internal force and dynamic response of residual structure is studied. 3) by directly applying explosive load method and introducing failure criterion, the bottom corner column of the spatial steel frame structure is eliminated, and the variation of internal force and the influence area of dynamic response of each remaining member before and after column failure are analyzed. In this paper, the displacement response, internal force redistribution and dynamic response of the structure are analyzed by using two methods. It is concluded that the variation trend of the internal force in the structure is basically the same before and after the column withdrawal. However, the simulation results of the method of removing the components are small. Therefore, if the failure of the structural members is caused by the effect of the explosive load, the method of directly applying the explosive load to the structure should be used to analyze the failure of the structural members. It is not recommended to use the method of removing members to analyze the continuous collapse dynamic of the structure.
【學(xué)位授予單位】：山東建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU391;TU311.3

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