外包鋼加固鋼筋混凝土柱的非線性分析
[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.
【學位授予單位】:蘭州理工大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TU375.3
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