【摘要】：建筑的改造和維修加固是解決鋼筋混凝土結(jié)構(gòu)安全、適用、耐久性,使其滿足正常使用需求的重要方式。外包型鋼加固法因具有改變結(jié)構(gòu)原有外形小、有效提高承載力和延性、受力可靠、施工簡便等優(yōu)點,而被廣泛應(yīng)用于各種加固工程。由于外包鋼靠近加固構(gòu)件外表面,火災(zāi)下極易受到高溫影響,因此其耐火性能是一個亟待解決的問題。同時,作為加固構(gòu)件,二次受力影響不可忽略�；诖�,本文在課題組對外包鋼加固RC梁耐火極限試驗研究的基礎(chǔ)上,考慮二次受力影響,對外包鋼加固RC梁抗火性能進行研究,并分析了多種參數(shù)對二次受力下外包鋼加固RC梁抗火性能的影響。主要研究工作及結(jié)論如下:(1)利用ABAQUS有限元軟件建立了外包鋼加固RC梁的溫度場有限元分析模型和兩種不同情況下外包鋼加固RC梁的熱-力耦合有限元分析模型,并用試驗數(shù)據(jù)對數(shù)值模型的適用性進行了對比驗證。(2)運用ABAQUS“殺死-激活”、“單元追蹤”的方法,通過不同一次受力水平的橫向?qū)Ρ确治?以及不同荷載比的縱向?qū)Ρ确治?分析了考慮二次受力下角鋼加固鋼筋混凝土梁的抗火性能。結(jié)果發(fā)現(xiàn):小荷載比時,二次受力對ASSRC梁火災(zāi)過程中的撓度發(fā)展可以忽略,而隨著荷載比增大,在熱力耦合作用下,二次受力效應(yīng)對結(jié)構(gòu)的影響也越明顯;加固梁所承受的第一次荷載水平對耐火極限的影響有限。(3)選取了混凝土強度、梁底縱筋直徑、縱筋屈服強度、角鋼屈服強度、角鋼厚度、角鋼寬度、荷載比,保護層厚度、翼緣板厚度、栓桿強度、栓桿布置間距,共計11個參數(shù)進行具體計算,分析了解各參數(shù)對考慮二次受力外包鋼加固RC梁抗火性能的影響。結(jié)果發(fā)現(xiàn):荷載比和砂漿保護層是影響二次受力外包鋼加固RC梁抗火性能的主要因素,螺栓強度、螺栓間距以及加固角鋼厚度的變化對耐火極限的影響很小,其他參數(shù)對二次受力外包鋼加固RC梁均有不同程度的影響。
[Abstract]:The reconstruction and maintenance and reinforcement of buildings is an important way to solve the safety, applicability and durability of reinforced concrete structures and make them meet the needs of normal use. Because of its advantages of changing the original shape of the structure, improving the bearing capacity and ductility effectively, being reliable and easy to construct, the outsourced steel reinforcement method has been widely used in various reinforcement projects. As the steel is close to the external surface of the strengthened members, it is easy to be affected by high temperature under fire, so its fire resistance is an urgent problem to be solved. At the same time, as a reinforced member, the influence of secondary force can not be ignored. Based on this, the fire resistance of RC beams strengthened with external clad steel is studied in this paper, considering the influence of secondary force, the fire resistance of RC beams strengthened with external clad steel is studied. The influence of various parameters on the fire resistance of RC beams strengthened with steel under secondary loading is analyzed. The main research work and conclusions are as follows: (1) using ABAQUS finite element software, the finite element analysis model of temperature field of RC beam strengthened by wrapped steel and the thermal-mechanical coupling finite element analysis model of RC beam strengthened by wrapped steel under two different conditions are established. The applicability of the numerical model is compared with the experimental data. (2) by using the methods of ABAQUS "kill-activation" and "element tracing", the horizontal comparative analysis of different stress levels and the longitudinal comparative analysis of different load ratios are carried out. The fire resistance of reinforced concrete beams strengthened with angle steel under secondary loading is analyzed. The results show that when the load ratio is small, the deflection development of ASSRC beam during fire can be neglected by the secondary force, but with the increase of the load ratio, the effect of secondary force on the structure is more obvious under the thermal coupling. The effect of the first load level on the fire resistance limit is limited. (3) the concrete strength, beam bottom longitudinal reinforcement diameter, longitudinal steel yield strength, angle steel thickness, angle width, load ratio and cover thickness are selected. The thickness of flange plate, the strength of bolt rod, the spacing of bolting rod are calculated in detail, and the influence of these parameters on the fire resistance of RC beams strengthened with steel under secondary loading is analyzed. The results show that the load ratio and mortar cover are the main factors that affect the fire resistance of RC beams strengthened by secondary load wrapped steel. The change of bolt strength, bolt spacing and the thickness of reinforced angle steel have little effect on the fire resistance limit. Other parameters have different effects on RC beams strengthened with secondary loading steel.
【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】：TU375.1

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