本文選題：預(yù)制復(fù)合保溫墻體 + 單面受火��； 參考：《東南大學(xué)》2015年碩士論文

【摘要】：隨著我國國民經(jīng)濟的快速增長,能源短缺問題日益嚴(yán)重,節(jié)能工作已成為可持續(xù)發(fā)展的重要保證,其中建筑節(jié)能已成為提高社會能源使用效率的首要方面。預(yù)制復(fù)合保溫墻體可實現(xiàn)預(yù)制、承重、保溫節(jié)能于一體,符合當(dāng)今我國大力開展建筑節(jié)能工作的政策,因而得到了廣泛的使用。但是隨之而來的建筑火災(zāi)隱患也增大,為了對此種新型墻體進行準(zhǔn)確的損傷鑒定及火災(zāi)后的修復(fù)與加固工作,對其進行火災(zāi)后的力學(xué)分析顯得尤為緊迫�；诖�,本文進行了預(yù)制復(fù)合保溫墻體的火災(zāi)后軸壓性能的試驗研究,并結(jié)合有限元軟件對其災(zāi)后力學(xué)性能進行了理論分析。主要研究內(nèi)容如下：(1)系統(tǒng)整理和歸納了高溫后混凝土的殘余抗壓強度、殘余抗拉強度、彈性模量、受壓應(yīng)力-應(yīng)變本構(gòu)關(guān)系和受拉應(yīng)力-應(yīng)變本構(gòu)關(guān)系以及高溫后鋼筋的極限強度、屈服強度、彈性模量、延伸率和應(yīng)力-應(yīng)變本構(gòu)關(guān)系。(2)分別進行了兩榀常溫預(yù)制復(fù)合保溫墻體及兩榀相應(yīng)保溫層厚度的火災(zāi)后墻體的軸壓承載力試驗研究,對四榀剪力墻的試驗過程進行了描述,并將兩組常溫墻體和火后墻體的極限抗壓承載力、荷載-位移曲線、荷載-混凝土應(yīng)變曲線及荷載-鋼筋應(yīng)變曲線進行了對比分析。研究表明：保溫層厚度為40mm和60mm的火災(zāi)后保溫墻體的極限承載力分別比常溫降低21.8%和16.8%；保溫層厚度相同時,在相同荷載作用下,火災(zāi)后墻體的位移、混凝土應(yīng)變及鋼筋應(yīng)變均大于常溫墻體；無論是常溫墻體還是火后墻體,在相同荷載作用下,由于墻體總厚度不變,有效的混凝土厚度隨保溫層厚度的增大而減小,故保溫層厚度較大墻體的位移、混凝土應(yīng)變及鋼筋應(yīng)變均稍大于保溫層厚度較小的墻體。(3)利用通用有限元分析軟件分析了各個墻體在軸壓下的力學(xué)性能,并與試驗結(jié)果進行對比分析,為理論分析提供了思路。(4)基于規(guī)范給出的剪力墻偏心受壓承載力計算公式,采用三臺階模型作為鋼筋和混凝土高溫后強度計算模型,并考慮受火時間、軸壓比及保護層厚度等因素對溫度場分布的影響,對單面受火后預(yù)制復(fù)合保溫墻體正截面偏心受壓承載力計算公式進行了推導(dǎo)和分析。
[Abstract]:With the rapid growth of China's national economy, the problem of energy shortage is becoming more and more serious. Energy conservation has become an important guarantee of sustainable development, among which building energy conservation has become the most important aspect to improve the efficiency of social energy use. Prefabricated composite insulation wall can realize prefabrication, load bearing, heat preservation and energy conservation, which is in line with the policy of building energy conservation in our country, so it has been widely used. However, the hidden danger of building fire also increases, in order to accurately identify the damage of this new wall and repair and reinforcement work after the fire, it is particularly urgent to carry out mechanical analysis after the fire. Based on this, the axial compression performance of prefabricated composite insulation wall after fire is studied, and the mechanical properties of prefabricated composite insulation wall after fire are analyzed theoretically with the finite element software. The main research contents are as follows: (1) the residual compressive strength, residual tensile strength, elastic modulus of concrete after high temperature are systematically sorted out and summarized. Compressive stress-strain constitutive relation, tensile stress-strain constitutive relation and ultimate strength, yield strength, elastic modulus of steel bar after high temperature, The axial compression capacity of two prefabricated composite insulation walls at room temperature and two walls with corresponding thickness of insulation layer after fire were studied respectively. The experimental process of four shear walls was described. The ultimate compressive capacity, load-displacement curve, load-concrete strain curve and load-reinforcement strain curve of two groups of normal temperature wall and post fire wall are compared and analyzed. The results show that the ultimate bearing capacity of the fire insulation wall with the thickness of 40mm and 60mm is 21.8% and 16.8% lower than that of the normal temperature respectively, and the displacement of the wall after fire occurs under the same load when the thickness of the insulation layer is the same. Both the strain of concrete and the strain of reinforcing bar are larger than that of the wall at room temperature, and the effective thickness of concrete decreases with the increase of the thickness of insulation layer under the same load, whether the wall at room temperature or the wall after fire, because the total thickness of the wall remains unchanged. Therefore, the displacement, the strain of concrete and the strain of steel bar are slightly larger than those of the wall with smaller thickness of insulation layer. The mechanical properties of each wall under axial compression are analyzed by using the general finite element analysis software. Compared with the test results, this paper provides a train of thought for theoretical analysis. (4) based on the formula given in the code, the three-step model is used as the strength calculation model of steel bar and concrete after high temperature. Considering the influence of fire time, axial compression ratio and thickness of protective layer on the distribution of temperature field, the calculation formula of eccentricity compression bearing capacity of normal section of prefabricated composite insulation wall after single side fire is deduced and analyzed.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU398.9

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