本文選題：預(yù)制裝配式鋼筋混凝土疊合梁 + 火災(zāi)　； 參考：《蘇州科技大學(xué)》2017年碩士論文

【摘要】：隨著節(jié)能減排、保護(hù)環(huán)境要求的日益提高,以及勞動力成本的快速上漲,建筑產(chǎn)業(yè)現(xiàn)代化成為可持續(xù)發(fā)展道路的重要途徑。作為建筑產(chǎn)業(yè)化的形式之一,裝配式結(jié)構(gòu)具有節(jié)能,環(huán)保,節(jié)省模板和縮短工期的優(yōu)點(diǎn),成為一個研究的熱點(diǎn)。目前對鋼筋混凝土疊合梁的研究主要集中于梁的靜力性能和抗震性能,而對于鋼筋混凝土疊合梁的抗火性能研究相對較少,對火災(zāi)高溫下疊合梁抗火能力及安全性缺乏必要的認(rèn)識�；诖�,本文開展了預(yù)制裝配式疊合梁抗火性能研究,主要研究工作如下:1.根據(jù)相關(guān)文獻(xiàn),整理了高溫下混凝土和結(jié)構(gòu)鋼的材料特性,以盡可能符合實(shí)際為原則,選用了本文研究所用混凝土和鋼材的熱工參數(shù)和應(yīng)力—應(yīng)變關(guān)系。2.利用有限元軟件ABAQUS驗(yàn)證了8根鋼筋混凝土梁的溫度場,在驗(yàn)證了模型合理性后,建立了疊合梁和現(xiàn)澆梁溫度場模型,并將兩者進(jìn)行了對比分析。3.利用有限元軟件ABAQUS驗(yàn)證了1根常溫下疊合梁力學(xué)模型和3根高溫下組合梁模型,在驗(yàn)證了模型合理性后,建立了疊合梁和現(xiàn)澆梁熱-力耦合模型。4.根據(jù)有限元軟件計算結(jié)果,分析了高溫下疊合面摩擦系數(shù)、高溫下疊合面滑移以及高溫下疊合梁和現(xiàn)澆梁中受壓區(qū)混凝土和縱筋應(yīng)力隨時間的變化規(guī)律,并將兩者進(jìn)行了對比分析,研究結(jié)果表明:由于疊合面大多數(shù)區(qū)域溫度在400℃左右,因此高溫下疊合面摩擦系數(shù)取為1,與常溫下相同;高溫下疊合面滑移明顯大于相同條件常溫下疊合梁;相同荷載比下,疊合梁受壓區(qū)混凝土初始應(yīng)力值要大于現(xiàn)澆梁的,且變化趨勢不同,初始應(yīng)力值隨荷載比的增大而增大;相同荷載比下,疊合梁縱筋初始應(yīng)力同樣大于現(xiàn)澆梁的,變化趨勢大致相似,初始應(yīng)力值隨荷載比的增大而增大;在相同荷載比下,疊合梁縱筋應(yīng)力始終大于現(xiàn)澆梁的,出現(xiàn)“應(yīng)力超前”現(xiàn)象。5.根據(jù)有限元軟件計算結(jié)果,分析了荷載比、混凝土強(qiáng)度等級、箍筋配筋率、疊合參數(shù)Kh、剪跨比和受火面等參數(shù)對疊合梁耐火極限的影響,并將相同截面疊合梁和現(xiàn)澆梁的耐火極限進(jìn)行對比分析,研究結(jié)果表明:隨著荷載比的提高,疊合梁耐火極限降低;隨著混凝土強(qiáng)度的提高,疊合梁耐火極限提高;箍筋配筋率對疊合梁耐火極限影響不顯著;當(dāng)疊合參數(shù)Kh小于一定數(shù)值時,疊合梁的耐火極限顯著提高;存在一個最佳的剪跨比使得疊合梁耐火極限最大;受火面對疊合梁耐火極限影響顯著,受火面越少相應(yīng)疊合梁耐火極限越高。疊合梁的耐火極限略大于現(xiàn)澆梁。本文的研究成果有助于為預(yù)制裝配式疊合梁抗火設(shè)計提供借鑒。
[Abstract]:With the increasing demand for energy saving and emission reduction and the rapid rise of the labor cost, the modernization of the construction industry has become an important way of the road of sustainable development. As one of the forms of building industrialization, the assembly structure has the advantages of energy saving, environmental protection, saving the template and shortening the time limit, and has become a hot spot of research. The study of reinforced concrete composite beams mainly focuses on the static and seismic performance of the beams, but the study on the fire resistance of the reinforced concrete composite beams is relatively few, and it lacks the necessary understanding of the fire resistance and safety of the laminated beams at high temperature. The research work is as follows: 1. according to the relevant literature, the material properties of concrete and structural steel at high temperature are collated, and the thermal parameters and stress-strain relationships of the concrete and steel used in this study are selected as possible, and the temperature field of 8 reinforced concrete beams is verified by the finite element software.2., which is verified. After the model is reasonable, the temperature field model of the laminated beam and the cast-in-place beam is established, and the two are compared and analyzed by.3.. The finite element software ABAQUS is used to verify the mechanical model of the laminated beam and the 3 composite beam model under the high temperature under the finite element software. After verifying the rationality of the model, the thermal force coupling model of the laminated beam and the cast-in-place beam is established by the finite element method (.4.), which is based on the finite element method (.4.). The calculation results of the meta software are used to analyze the friction coefficient of superposition surface at high temperature, the slip of overlapped surface at high temperature and the change law of the stress of concrete and longitudinal reinforcement in the compression zone of superposed beams and cast-in-place beams at high temperature, and the comparison and analysis are carried out. The results show that because most of the area temperature of the overlapped surface is about 400 degrees C, it is high. The friction coefficient of the laminated surface is 1, which is the same as that under normal temperature; the slip surface slip at high temperature is obviously greater than that under the same condition at normal temperature. Under the same load ratio, the initial stress value of the concrete in the compression zone of the laminated beam is greater than that of the cast-in-place beam, and the change trend is different, the initial stress value increases with the increase of the load ratio; under the same load ratio, the superposition is superimposed. The initial stress of beam longitudinal reinforcement is also larger than that of cast-in-place beam. The change trend is roughly similar, the initial stress value increases with the increase of load ratio. Under the same load ratio, the stress of the longitudinal reinforcement is always larger than that of the cast-in-place beam, and the phenomenon of "stress ahead" appears "stress ahead" phenomenon.5. analyses load ratio, concrete strength grade, and stirrup according to the calculation results of finite element software. The effects of the ratio of reinforcement, the Kh, the shear span ratio and the fire surface on the fire resistance limit of the laminated beams, and the comparison and analysis of the fire resistance of the laminated beams and the cast-in-situ beams are carried out. The results show that the fire resistance limit of the composite beams decreases with the increase of the load ratio; with the increase of the strength of the concrete, the fire resistance limit of the composite beams is improved; the stirrup of the stirrups is improved. The reinforcement ratio has no significant effect on the refractory limit of the laminated beam; when the superposition parameter Kh is less than a certain value, the fire resistance limit of the laminated beam is significantly improved; there is a optimum shear span ratio that makes the maximum fire resistance limit, the fire resistance of the laminated beam is significant, the less the fire face is, the higher the fire resistance limit of the laminated beam. The resistance of the laminated beam to the composite beam. The limit of fire is slightly larger than that of cast-in-place beams. The research results in this paper can help to provide reference for the fire resistance design of prefabricated composite beams.
【學(xué)位授予單位】：蘇州科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU352.5

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相關(guān)期刊論文 前10條

1 蔣翔;童根樹;張磊;;耐火鋼-混凝土組合梁抗火性能試驗(yàn)[J];浙江大學(xué)學(xué)報(工學(xué)版);2016年08期

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本文編號：2027909