【摘要】：外包鋼加固法因其具有現(xiàn)場(chǎng)工作量小、對(duì)建筑空間影響小、施工周期短等優(yōu)點(diǎn)而在加固行業(yè)得到廣泛推廣,被人們用來加固鋼筋混凝土等結(jié)構(gòu)。特別是用于鋼筋混凝土構(gòu)件的加固,能明顯改善構(gòu)件的承載力、剛度等。因此,研究外包鋼加固鋼筋混凝土柱的非線性是一項(xiàng)實(shí)用價(jià)值很高的學(xué)術(shù)課題。對(duì)于外包鋼加固的鋼筋混凝土柱,國內(nèi)外學(xué)者進(jìn)行了大量的試驗(yàn)研究,并得出了一些重要結(jié)論。本文鑒于前人的研究,對(duì)于有應(yīng)力歷史的鋼筋混凝土柱加固前進(jìn)行卸載,研究卸載量的多少對(duì)鋼筋混凝土柱二次受力后受力性能的影響。利用有限元軟件ABAQUS,根據(jù)《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》和《混凝土結(jié)構(gòu)加固設(shè)計(jì)規(guī)范》相關(guān)規(guī)定,采用混凝土塑性損傷本構(gòu)模型及鋼筋和外包鋼的線性強(qiáng)化彈塑性本構(gòu)模型,建立六個(gè)不同卸載量的外包鋼鋼筋混凝土柱模型,在軸心加載和偏心加載的情況下對(duì)其分別進(jìn)行非線性分析,研究卸載量的多少對(duì)構(gòu)件的承載力、延性以及外包鋼利用率的影響。同時(shí),建立五個(gè)有限元模型分析外包鋼厚度及強(qiáng)度、綴板間距、角鋼及綴板截面尺寸、應(yīng)力歷史等對(duì)鋼筋混凝土柱加固性能的影響。通過有限元分析得出以下結(jié)論:對(duì)于軸心受壓的鋼筋混凝土柱,加固時(shí)卸載60%左右承載力提高幅度最大,加固柱延性最好;對(duì)于偏心受壓的加固柱,卸載40%左右時(shí)其加固效果最好;在不同的應(yīng)力水平指標(biāo)下,隨著外包鋼厚度的增加,應(yīng)力水平指標(biāo)越小加固柱承載力及外包鋼利用率越高;改變綴板間距,發(fā)現(xiàn)綴板間距越小加固柱承載力越高,但承載力提高幅度不是線性增加,經(jīng)有限元分析發(fā)現(xiàn),綴板間距在250mm~300mm之間時(shí),承載力提高幅度最大,加固效果最好;改變角鋼截面尺寸和綴板截面尺寸進(jìn)行研究,發(fā)現(xiàn)增大角鋼邊長比增大綴板寬度加固效果更明顯,其加固柱承載力最大能提高34.11%。采用《混凝土結(jié)構(gòu)加固設(shè)計(jì)規(guī)范》中外包鋼加固混凝土柱極限承載力公式及外包鋼利用系數(shù)公式對(duì)所建模型進(jìn)行了有關(guān)理論計(jì)算,將數(shù)值模擬值和理論計(jì)算值進(jìn)行對(duì)比分析,發(fā)現(xiàn)模擬值在規(guī)范規(guī)定的范圍內(nèi),說明模型符合要求,得出本文研究內(nèi)容可以為工程實(shí)例提供理論依據(jù)和參考價(jià)值。
[Abstract]:Because of its advantages such as small on-site workload, small influence on building space and short construction cycle, the steel-coated steel reinforcement method has been widely used in the reinforcement industry, and has been used to strengthen reinforced concrete structures and so on. Especially for the reinforcement of reinforced concrete members, the bearing capacity and stiffness of the members can be obviously improved. Therefore, it is a practical and valuable academic subject to study the nonlinearity of reinforced concrete columns strengthened with steel. A large number of experimental studies have been carried out on reinforced concrete columns strengthened with steel, and some important conclusions have been drawn. In view of the previous research, the unloading of reinforced concrete columns with stress history before reinforcement is carried out, and the influence of the amount of unloading on the performance of reinforced concrete columns after secondary loading is studied in this paper. By using the finite element software ABAQUS, the plastic damage constitutive model of concrete and the linear reinforced elastoplastic constitutive model of steel bar and coated steel are adopted according to the relevant regulations of Code for Design of concrete structures and Code for Design of reinforced concrete structures. Six models of steel-clad reinforced concrete columns with different unloading capacity were established, and the nonlinear analysis was carried out under axial loading and eccentric loading respectively, and the bearing capacity of the components was studied by studying how much the unloading capacity was to the members, and then analyzed the load-bearing capacity of the concrete columns under axial loading and eccentric loading respectively. The effect of ductility and utilization ratio of coated steel. At the same time, five finite element models are set up to analyze the influence of the thickness and strength of coated steel, the spacing of affixed plates, the cross-section size of angle steel and affixed plates, and the stress history on the strengthening performance of reinforced concrete columns. Through the finite element analysis, the following conclusions are drawn: for reinforced concrete columns subjected to axial compression, the maximum increase in bearing capacity is about 60% or so when strengthened, and the ductility of reinforced columns is the best. Under different stress level indexes, the smaller the stress level index, the higher the bearing capacity of reinforced columns and the higher the utilization ratio of outer steel, with the increase of the thickness of coated steel, and for the columns strengthened by eccentric compression, the loading capacity is the best when the load is unloaded about 40%. It is found that the smaller the spaced plate spacing is, the higher the bearing capacity is, but the increase in bearing capacity is not linear. Through finite element analysis, it is found that when the spacing is between 250mm~300mm, the bearing capacity increase is the largest and the strengthening effect is the best. It is found that the reinforcement effect is more obvious when the length of the angle steel is increased than the width of the plywood, and the bearing capacity of the reinforced column can be increased by 34.11% at the maximum, by changing the cross-section size of the angle steel and the section size of the patch plate. The formula of ultimate bearing capacity of reinforced concrete columns and the formula of outer steel utilization coefficient are used to calculate the model, and the numerical simulation value and theoretical calculation value are compared and analyzed by using the Code of Design for reinforcement of concrete structures and the formula of ultimate bearing capacity of concrete columns strengthened by external steel and the formula of outer steel utilization coefficient. It is found that the simulation value is within the scope of the code, indicating that the model meets the requirements, and that the research content of this paper can provide theoretical basis and reference value for engineering examples.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU375.3

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