【摘要】：由于火災(zāi)試驗(yàn)費(fèi)用高昂,目前關(guān)于樓板的抗火性能研究尚不夠充分,約束作用下鋼筋混凝土雙向板的火災(zāi)試驗(yàn)少之又少。此外,多數(shù)火災(zāi)在局部蔓延時(shí)即被撲滅,加之混凝土熱惰性對(duì)建筑結(jié)構(gòu)、構(gòu)件的保護(hù)作用,火災(zāi)后建筑物修復(fù)加固的可能性較大。為更加深入地理解約束鋼筋混凝土雙向板的抗火性能,了解火災(zāi)后該構(gòu)件的力學(xué)性能,開展了火災(zāi)下(后)約束鋼筋混凝土雙向板的承載性能試驗(yàn)研究和理論分析。主要工作如下:(1)基于已有模型或相關(guān)文獻(xiàn)試驗(yàn)數(shù)據(jù),不考慮混凝土骨料類型、鋼筋強(qiáng)度和鋼筋等級(jí)等因素,歸納和總結(jié)了高溫下和高溫后混凝土和鋼筋的材料力學(xué)性能,提出了混凝土和鋼筋在高溫下和高溫冷卻后的力學(xué)性能模型。(2)對(duì)1塊面內(nèi)約束和角部約束鋼筋混凝土雙向板進(jìn)行了抗火性能試驗(yàn),對(duì)混凝土截面溫度、鋼筋溫度、平面內(nèi)外位移、板角反力和裂縫開展及破壞模式進(jìn)行了試驗(yàn)研究。研究表明,面內(nèi)約束會(huì)降低雙向板的抗火性能,主要表現(xiàn)在變形速率和面外位移增大;配筋率對(duì)樓板的抗火性能有積極作用。研發(fā)設(shè)計(jì)了一套無(wú)線測(cè)溫系統(tǒng),在電爐試驗(yàn)和火災(zāi)試驗(yàn)中與有線測(cè)量方式進(jìn)行了對(duì)比試驗(yàn),試驗(yàn)表明該系統(tǒng)具有可行性。(3)對(duì)角部約束火災(zāi)后板和未受火板進(jìn)行了承載性能對(duì)比試驗(yàn),對(duì)極限承載力、平面內(nèi)外位移、鋼筋應(yīng)變、板角反力和裂縫開展及破壞模式進(jìn)行了試驗(yàn)觀察和對(duì)比分析。結(jié)果表明,火災(zāi)后板的極限承載力較未受火板降低較少,但抗變形能力減弱,混凝土脫落現(xiàn)象較為嚴(yán)重。(4)基于經(jīng)典塑性鉸線理論,在李國(guó)強(qiáng)模型基礎(chǔ)上,提出了常溫時(shí)不同配筋率下的鋼筋破壞和混凝土壓碎破壞兩種計(jì)算模型。鋼筋破壞模型中,對(duì)板中間橢圓鋼筋網(wǎng)簡(jiǎn)化成矩形鋼筋網(wǎng),并提出鋼筋極限應(yīng)變差破壞準(zhǔn)則,通過(guò)與試驗(yàn)結(jié)果和其他模型比較驗(yàn)證合理,且極大地簡(jiǎn)化了計(jì)算過(guò)程�；炷翂核槟Ｐ蛯�(duì)截面內(nèi)混凝土強(qiáng)度和受壓區(qū)域進(jìn)行了假定,計(jì)算結(jié)果較好,可以為鋼筋混凝土雙向板的承載能力評(píng)估提供參考。(5)對(duì)常溫下雙向板計(jì)算模型進(jìn)行了高溫下和高溫后修正,并考慮面內(nèi)約束作用,建立了約束雙向板計(jì)算模型。結(jié)果表明:面內(nèi)約束力越大,雙向板極限承載力降低越大;雙向面內(nèi)約束力較單向面內(nèi)約束力對(duì)板的極限承載力降低幅度大,且降低幅度大于單向約束力的2倍。
[Abstract]:Due to the high cost of fire test, the research on fire resistance of floor slab is not enough, and the fire test of reinforced concrete two-way slab under restraint is rare. In addition, most of the fires are extinguished when they are spread locally, and the thermal inertia of concrete can protect the building structure and components, so it is possible to repair and reinforce the building after the fire. In order to better understand the fire resistance of confined reinforced concrete two-way slabs and understand the mechanical properties of the members after fire, the experimental study and theoretical analysis of the bearing capacity of reinforced concrete bidirectional slabs under fire were carried out. The main work is as follows: (1) based on the existing model or related literature test data, the mechanical properties of concrete and steel bar under high temperature and after high temperature are summarized and summarized without considering the type of concrete aggregate, the strength of steel bar and the grade of steel bar, etc. The mechanical performance model of concrete and steel bar under high temperature and high temperature cooling is put forward. (2) the fire resistance test of a reinforced concrete bidirectional slab with in-plane and corner restraint is carried out, and the temperature of the section of concrete and the temperature of steel bar are tested. The internal and external displacement, plate angle reaction force, crack development and failure mode are studied experimentally. The results show that the in-plane constraint can reduce the fire resistance of the bidirectional slab, which is mainly reflected in the increase of the deformation rate and the out-of-plane displacement, and the reinforcement ratio has a positive effect on the fire resistance of the floor. A wireless temperature measuring system has been developed and designed, which is compared with wired measurement in electric furnace test and fire test. The test results show that the system is feasible. (3) the load-bearing capacity of the plate after the corner restrained fire is compared with that of the plate without fire, and the ultimate bearing capacity, the displacement inside and outside the plane, the strain of steel bar are tested. The experimental observation and comparative analysis of plate angle reaction force and crack development and failure mode were carried out. The results show that the ultimate bearing capacity of the plate after fire is less than that of the unburned slab, but the deformation resistance is weakened, and the phenomenon of concrete shedding is more serious. (4) based on the classical plastic hinge theory and Li Guoqiang's model, Two calculating models of steel bar failure and concrete crushing failure under different reinforcement ratio at room temperature are proposed. In the failure model of steel bar, the elliptical steel mesh in the middle of the slab is simplified into a rectangular steel mesh, and the failure criterion of ultimate strain difference of steel bar is proposed. The results are compared with the experimental results and other models, and the calculation process is greatly simplified. The concrete crushing model assumes the strength and compressive region of concrete in the section, and the calculated results are good. It can provide a reference for the evaluation of the bearing capacity of reinforced concrete bidirectional slabs. (5) the calculation model of bidirectional slabs under normal temperature is modified at high temperature and after high temperature, and the calculation model of constrained bidirectional slabs is established considering the in-plane constraint. The results show that the greater the in-plane binding force, the greater the ultimate bearing capacity of bidirectional plate, and the greater the reduction range of bidirectional in-plane binding force is compared with that of unidirectional in-plane binding force, and the decrease range is more than two times that of unidirectional binding force.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU37

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本文編號(hào)：2246424