【摘要】：隨著建筑物向著高層化、大規(guī)�；约岸喙δ芑l(fā)展,建筑火災(zāi)成為人們面臨的一種發(fā)生頻率較高的災(zāi)害。在一棟建筑物中,柱子是主要的受力構(gòu)件,決定著該建筑的安全性能。鋼管鋼骨混凝土組合柱作為一種新型構(gòu)件,相對(duì)于普通混凝土柱和鋼管混凝土柱有著較好的力學(xué)性能。但目前,對(duì)其力學(xué)性能的研究大都處于常溫下的研究,其高溫后力學(xué)性能的研究較少,因此限制了該組合結(jié)構(gòu)的應(yīng)用與推廣。 本文利用ABAQUS有限元軟件,對(duì)鋼管鋼骨混凝土組合柱構(gòu)件進(jìn)行了以下研究： (1)在以往的研究基礎(chǔ)上,進(jìn)行了軸壓短柱常溫下和高溫后的承載力模擬分析,并推導(dǎo)出高溫后軸壓短柱極限承載力計(jì)算的簡(jiǎn)化公式,并對(duì)計(jì)算值和模擬值進(jìn)行對(duì)比,二者吻合較好。 (2)通過選取偏心距、加載方向、以及溫度為主要參數(shù),研究了構(gòu)件的偏壓力學(xué)性能,并根據(jù)其不同受力階段的應(yīng)力云圖對(duì)其受力機(jī)理進(jìn)行分析,結(jié)果顯示：強(qiáng)軸加載時(shí)的承載力要高于弱軸加載時(shí)的承載力。組合柱的偏壓承載力除了與強(qiáng)弱軸有關(guān)系外,還與偏心距的大小有著關(guān)系,當(dāng)偏心距較小時(shí),強(qiáng)軸比弱軸承載力提高的多,當(dāng)偏心距較大時(shí),強(qiáng)軸比弱軸的承載力提高的少。并在軸壓公式的基礎(chǔ)上通過引入偏心率折減系數(shù)和緊箍效應(yīng)系數(shù)來驗(yàn)證模擬的高溫后的極限承載力,驗(yàn)證結(jié)果表明模擬結(jié)果與計(jì)算結(jié)果吻合較好。 (3)選取不同長(zhǎng)細(xì)比的組合構(gòu)件,以長(zhǎng)細(xì)比、配骨指標(biāo)和溫度為主要參數(shù)對(duì)其穩(wěn)定承載力進(jìn)行分析,結(jié)果顯示：構(gòu)件的承載力隨著長(zhǎng)細(xì)比的增大而減小,配骨指標(biāo)的增大可以提高組合柱的延性。溫度的升高,會(huì)導(dǎo)致組合柱承載力的降低。并建立了高溫后組合柱的軸壓穩(wěn)定承載力計(jì)算公式和偏壓穩(wěn)定承載力計(jì)算公式,計(jì)算結(jié)果與模擬結(jié)果吻合良好。
[Abstract]:With the development of building towards high-level, large-scale and multi-function, building fire has become a high frequency disaster. In a building, the pillar is the main force component, which determines the safety performance of the building. Steel-reinforced concrete-filled steel tubular columns, as a new type of member, have better mechanical properties than ordinary concrete-filled steel tube columns and concrete-filled steel tube columns. But at present, the research on the mechanical properties of the composite structure is mostly at room temperature, and the study of its mechanical properties after high temperature is less. Therefore, the application and popularization of the composite structure are limited. In this paper, the ABAQUS finite element software is used to study the steel tubular steel reinforced concrete composite columns as follows: (1) on the basis of previous research, the bearing capacity of short columns under axial compression at room temperature and after high temperature is simulated and analyzed. A simplified formula for calculating the ultimate bearing capacity of short columns under axial compression after high temperature is derived, and the calculated values are compared with the simulated values, which are in good agreement with each other. (2) by selecting the eccentricity, loading direction and temperature as the main parameters, the mechanical properties of the component under bias pressure are studied, and the mechanical mechanism of the component is analyzed according to the stress cloud diagram of the different stress stages. The results show that the bearing capacity of strong axial loading is higher than that of weak axial loading. The bearing capacity of composite columns is not only related to the strong and weak axes, but also to the size of eccentricity. When the eccentricity is small, the load capacity of the strong axis is increased more than that of the weak bearing, and when the eccentricity is large, the bearing capacity of the strong shaft is less than that of the weak axis. On the basis of axial compression formula, the ultimate bearing capacity after high temperature is verified by introducing eccentricity reduction coefficient and tightening effect coefficient. The results show that the simulation results are in good agreement with the calculated results. (3) the stability bearing capacity of composite member with different slenderness ratio is analyzed by taking the slenderness ratio, bone matching index and temperature as the main parameters. The results show that the bearing capacity of the composite member decreases with the increase of the slenderness ratio, and the stability bearing capacity of the composite member decreases with the increase of slenderness ratio. The ductility of composite columns can be improved with the increase of bone matching index. The increase of temperature will lead to the decrease of bearing capacity of composite columns. The calculation formulas of axial compression stability bearing capacity and bias pressure stability bearing capacity of composite columns after high temperature are established. The calculated results are in good agreement with the simulation results.
【學(xué)位授予單位】：沈陽大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU398.9

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