本文選題：鋼筋混凝土 + 約束方式��； 參考：《湘潭大學(xué)》2017年碩士論文

【摘要】：結(jié)構(gòu)抗火是結(jié)構(gòu)工程領(lǐng)域里一個重要的研究課題。目前對火災(zāi)作用下鋼筋混凝土力學(xué)性能的研究較多,但考慮初始荷載影響的并不多,且大部分研究所采用的試件尺寸較小,尺寸效應(yīng)將導(dǎo)致構(gòu)件在高溫時產(chǎn)生明顯的不均勻溫度場,這將直接影響火災(zāi)作用下鋼筋混凝土構(gòu)件的力學(xué)性能。目前國內(nèi)外的混凝土抗火研究大都沒有考慮相鄰構(gòu)件的影響,而在實際火災(zāi)中,由于相鄰構(gòu)件間存在相互約束作用,當(dāng)某個構(gòu)件受到火災(zāi)作用時,會受到相鄰構(gòu)件的約束,其抗火性能必然與單個構(gòu)件受火的情況有所不同。為此,本文開展了受軸力及剛度約束的較大尺寸鋼筋混凝土短柱經(jīng)歷ISO-834標(biāo)準(zhǔn)火災(zāi)升降溫作用后的軸壓力學(xué)性能試驗研究,具體內(nèi)容如下:(1)采用ABAQUS有限元分析軟件對鋼筋混凝土短柱經(jīng)歷ISO-834標(biāo)準(zhǔn)火災(zāi)作用的截面溫度場分布進行分析,并通過3個鋼筋混凝土短柱的溫度場試驗驗證有限元分析模型的可靠性。(2)開展21個經(jīng)歷ISO-834標(biāo)準(zhǔn)火災(zāi)升降溫作用的鋼筋混凝土短柱軸壓力學(xué)性能試驗,主要考察了約束方式、升降溫時間和軸壓比對混凝土短柱高溫下變形、剩余承載力、軸壓剛度的影響。(3)采用高溫下鋼筋和混凝土的強度、彈性模量的損傷模型以及應(yīng)力-應(yīng)變關(guān)系模型,計算了高溫下鋼筋混凝土短柱的剩余承載力、剩余軸壓剛度以及荷載-軸向變形關(guān)系。再將本文試驗結(jié)果與理論分析以及相關(guān)試驗結(jié)果進行對比,分析軸壓比、升降溫制度對高溫下鋼筋混凝土短柱的承載力、軸壓剛度以及荷載-軸向變形關(guān)系的影響。
[Abstract]:Structural fire resistance is an important research topic in the field of structural engineering. At present, there are many researches on the mechanical properties of reinforced concrete under fire, but the effect of initial load is not much, and the size of the specimens used in most of the studies is small. The size effect will lead to the obvious inhomogeneous temperature field at high temperature, which will directly affect the mechanical properties of reinforced concrete members under fire. At present, the research of concrete fire resistance at home and abroad has not considered the influence of adjacent members, but in the actual fire, because of the interaction between adjacent members, when a member is affected by fire, it will be constrained by adjacent members. Its fire resistance must be different from that of a single member. Therefore, an experimental study on the axial compression mechanical properties of large reinforced concrete short columns subjected to ISO-834 standard fire was carried out in this paper, which was constrained by axial force and stiffness. The specific contents are as follows: (1) using ABAQUS finite element analysis software, the section temperature field distribution of reinforced concrete short columns subjected to ISO-834 standard fire is analyzed. The reliability of the finite element analysis model is verified by the temperature field test of three reinforced concrete short columns. The reliability of the finite element analysis model is verified. 21 tests on the axial compressive mechanical properties of the reinforced concrete short columns which have experienced the effect of ISO-834 standard fire rise and cooling are carried out, and the restraint mode is mainly investigated. The influence of deformation, residual bearing capacity and axial compression stiffness of short concrete columns under high temperature, such as rising and cooling time and axial compression ratio. The damage model of strength, elastic modulus and stress-strain relationship model of steel bar and concrete under high temperature is adopted. The residual bearing capacity, residual axial compression stiffness and load-axial deformation relationship of reinforced concrete short columns at high temperature are calculated. Then the experimental results of this paper are compared with the theoretical analysis and related test results, and the influence of axial compression ratio, temperature rise and cooling system on the bearing capacity, axial compression stiffness and load-axial deformation relationship of reinforced concrete short columns under high temperature is analyzed.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU375.3

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