本文關(guān)鍵詞：火災(zāi)作用下鋼管混凝土柱接觸熱阻非線性模型研究　出處：《西南科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 鋼管混凝土柱 火災(zāi)作用下 接觸熱阻 非線性模型

【摘要】：隨著鋼管混凝土柱在高層和超高層建筑的廣泛應(yīng)用,以及高層和超高層建筑火災(zāi)帶來的巨大損失和危害,其在火災(zāi)作用下的溫度及位移響應(yīng)也受到越來越多的關(guān)注。鋼管混凝土柱由于鋼管與混凝土之間接觸不緊密,在火災(zāi)作用下將產(chǎn)生接觸熱阻,接觸熱阻的存在將影響鋼管混凝土柱在火災(zāi)下的溫度響應(yīng)和位移響應(yīng)。因此研究鋼管混凝土柱接觸熱阻非線性變化影響因素,建立接觸熱阻非線性模型,對于研究鋼管混凝土柱火災(zāi)高溫作用下的準(zhǔn)確溫度響應(yīng)和位移響應(yīng)有著重要意義。本文將從以下幾個方面對鋼管混凝土柱接觸熱阻非線性模型進(jìn)行研究:(1)考慮了初始間隙、界面溫度、以及鋼管與混凝土黑度等多種因素的影響,利用傳熱學(xué)基本理論建立了高溫作用下鋼管混凝土柱接觸熱阻非線性理論模型,并通過鋼管混凝土柱實際高溫荷載試驗測得曲線進(jìn)行驗證,驗證了該理論的真實合理性。(2)選擇合適的有限元模型,確定材料的熱工參數(shù)及邊界條件后引入鋼管混凝土柱接觸熱阻非線性模型對火災(zāi)高溫作用下的鋼管混凝土柱進(jìn)行熱分析,得到鋼管混凝土柱溫度場分布,與鋼管混凝土柱實際高溫荷載試驗進(jìn)行驗證,得到了火災(zāi)高溫作用下鋼管混凝土柱的準(zhǔn)確的溫度場分布。(3)在熱分析的基礎(chǔ)上,合理選擇鋼材、混凝土的本構(gòu)模型,對其進(jìn)行熱-力耦合分析,得到鋼管混凝土柱在火災(zāi)高溫作用下的應(yīng)力場及應(yīng)變場響應(yīng)。
[Abstract]:With the wide application of concrete-filled steel tubular columns in high-rise and super-high-rise buildings, the fire of high-rise and super-high-rise buildings has caused great losses and hazards. More and more attention has been paid to the temperature and displacement response of CFST columns under fire. Because the contact between CFST and concrete is not close contact thermal resistance will be generated under fire. The existence of contact thermal resistance will affect the temperature response and displacement response of concrete-filled steel tubular columns under fire. Therefore, the nonlinear influence factors of contact thermal resistance of concrete-filled steel tubular columns are studied, and the nonlinear contact thermal resistance model is established. It is of great significance to study the accurate temperature response and displacement response of concrete-filled steel tubular columns under fire temperature. In this paper, the nonlinear model of contact thermal resistance of concrete-filled steel tubular columns is studied from the following aspects: 1). The initial gap is considered. Based on the basic theory of heat transfer, the nonlinear model of contact thermal resistance of concrete filled steel tubular column under high temperature is established by the influence of interface temperature and blackness of steel tube and concrete. And through the actual high temperature load test curve of CFST column to verify the true rationality of the theory. 2) choose the appropriate finite element model. After determining the thermal parameters and boundary conditions of the material, the contact thermal resistance nonlinear model of concrete-filled steel tubular columns is introduced to analyze the thermal properties of concrete-filled steel tubular columns under fire and high temperature, and the temperature field distribution of concrete filled steel tubular columns is obtained. Verified by the actual high temperature load test of CFST columns, the accurate temperature field distribution of CFST columns under fire and high temperature is obtained. On the basis of thermal analysis, reasonable selection of steel is obtained. The constitutive model of concrete is analyzed by thermal-mechanical coupling, and the stress and strain field responses of concrete-filled steel tubular columns under fire and high temperature are obtained.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU398.9

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