【摘要】：大量的既有建筑物沒有經(jīng)過抗連續(xù)性倒塌的設(shè)計(jì),存在發(fā)生連續(xù)性倒塌的風(fēng)險(xiǎn),如果由于各種因素綜合作用而導(dǎo)致建筑物發(fā)生了連續(xù)性倒塌事故,就必然會(huì)造成重大的人員傷亡及經(jīng)濟(jì)財(cái)產(chǎn)損失。因此,研究建筑物防連續(xù)倒塌的力學(xué)響應(yīng),采用合理的加固方案提高既有建筑物的整體性與安全性已成為急需解決的問題。粘鋼加固法以其高強(qiáng)高效、經(jīng)濟(jì)簡單等優(yōu)點(diǎn),適用于提高鋼筋混凝土框架結(jié)構(gòu)抗連續(xù)性倒塌能力。采用ANSYS有限元軟件建立了6層鋼筋混凝土框架結(jié)構(gòu)數(shù)值分析模型,通過對(duì)不同失效工況下數(shù)值模型的線性靜力及非線性靜力風(fēng)險(xiǎn)評(píng)估,得出了在角柱失效工況下,框架結(jié)構(gòu)會(huì)發(fā)生連續(xù)性倒塌。為了進(jìn)一步分析不同失效工況下的評(píng)估結(jié)果,建立了四種梁柱子結(jié)構(gòu)有限元模型,并進(jìn)行了非線性靜力分析,通過研究其抗力-位移曲線、抗力-時(shí)間曲線、裂縫發(fā)展情況、塑性鉸、混凝土及鋼筋的強(qiáng)度變化等參數(shù),得出了不同梁柱子結(jié)構(gòu)的抗力機(jī)制。基于結(jié)構(gòu)的風(fēng)險(xiǎn)評(píng)估結(jié)果及抗力機(jī)制,針對(duì)角柱失效工況,提出了三種不同的粘鋼加固方案,分別建立了加固后的鋼筋混凝土梁柱子結(jié)構(gòu)有限元模型,并進(jìn)行了非線性靜力計(jì)算。通過比較承載能力、延性及裂縫等指標(biāo),得出了加固后梁柱子結(jié)構(gòu)的抗力機(jī)制。選取兩種較優(yōu)的粘鋼加固方案,建立了加固后的鋼筋混凝土框架結(jié)構(gòu)整體模型,通過對(duì)數(shù)值模型的非線性靜力風(fēng)險(xiǎn)評(píng)估,表明加固后的框架結(jié)構(gòu)不會(huì)發(fā)生連續(xù)性倒塌破壞,進(jìn)一步證實(shí)了加固方案的有效性�；诒疚牡挠邢拊治�,提出了一些針對(duì)于建筑物抗連續(xù)性倒塌的加固建議。
[Abstract]:A large number of existing buildings have not been designed to resist continuous collapse, and there is a risk of continuous collapse. It will inevitably cause heavy casualties and economic and property losses. Therefore, it has become an urgent problem to study the mechanical response of buildings against continuous collapse and to improve the integrity and safety of existing buildings by means of reasonable reinforcement schemes. Due to its advantages of high strength and high efficiency, simple economy and so on, the bonded steel reinforcement method is suitable for improving the continuous collapse resistance of reinforced concrete frame structures. The numerical analysis model of six story reinforced concrete frame structure is established by using ANSYS finite element software. Through the linear static and nonlinear static risk assessment of the numerical model under different failure conditions, the failure condition of corner column is obtained. The frame structure will collapse continuously. In order to further analyze the evaluation results under different failure conditions, four kinds of finite element models of Liang Zhu substructure were established, and the nonlinear static analysis was carried out. The resistance displacement curve, resistance time curve and crack development were studied. The resistance mechanism of different beam-column structures is obtained by the parameters of plastic hinge, strength change of concrete and steel bar. Based on the risk assessment results and resistance mechanism of the structure, three different reinforced concrete beam and column structure finite element models are proposed in view of the failure condition of the corner column. The nonlinear static calculation is carried out. By comparing the bearing capacity, ductility and crack, the resistance mechanism of strengthening post-beam structure is obtained. Two kinds of steel bonded reinforcement schemes are selected and the whole reinforced concrete frame structure model is established. Through the nonlinear static risk assessment of the numerical model, it is shown that the strengthened frame structure will not collapse continuously. The effectiveness of the reinforcement scheme is further verified. Based on the finite element analysis in this paper, some reinforcement suggestions for continuous collapse of buildings are put forward.
【學(xué)位授予單位】：河北建筑工程學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU375.4;TU312.3

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