玄武巖纖維布加固鋼筋混凝土T型梁力學(xué)性能數(shù)值分析
[Abstract]:Basalt fiber (BFRP) composite is a new type of composite material, which has the advantages of high strength, corrosion resistance, high temperature resistance, good elongation and low price, etc. At present, it is more and more favored by experts and scholars at home and abroad. Based on the experimental study and finite element numerical analysis theory, the flexural behavior of reinforced concrete T-beam strengthened with basalt fiber sheet is analyzed numerically in this paper, in order to provide the basis for engineering application. In this paper, the mechanical properties of reinforced concrete T-beam strengthened by BFRP are numerically analyzed and verified by using the finite element analysis software ABAQUS and the principle of damage and fracture. The damage and cracking behavior of cohesive force model is used to simulate the bonding interface. The rationality of the finite element model is verified by comparing the finite element numerical results with the experimental results, and the flange height, reinforcement ratio and elastic modulus are further studied. The influence of main factors, such as the arrangement of U type hoop and the secondary force, on the reinforcement effect. The results of finite element analysis show that the adhesive layer of reinforced concrete T-beam strengthened with Wuyan fiber sheet has not been destroyed, and the stress between concrete beam and basalt fiber cloth can be transferred effectively, and the T-beam with high flange can be strengthened. The bearing capacity is improved more, the reinforcement effect is more obvious, the basalt fiber cloth is suitable for the reinforcement beam with relatively low reinforcement ratio, but the reinforcement effect is not obvious when the reinforcement ratio is high. The high elastic modulus of basalt fiber cloth can increase the ultimate bearing capacity of the section, but reduce the ductility of the section, increase the U type hoop can improve the shear capacity of the section and improve the reinforcement effect. The reinforcement effect of the secondary load will decrease with the increase of the initial load, and the ductility will decrease accordingly. Based on the results of finite element numerical analysis and experimental research, this paper analyzes the main influence factors on the reinforcement effect of reinforced concrete T-beam strengthened by BFRP, and puts forward a more economical and reasonable strengthening method of basalt fiber cloth. The suggestion of reinforcement scheme and design method is summarized, which provides some reference for practical engineering application. The innovations of this paper are as follows: based on the experiment, the failure mode of strengthened beams under various influence factors is analyzed by numerical analysis, and the adhesive layer between basalt fiber cloth and reinforced concrete is simulated by interface element. The reinforcement effect of basalt fiber cloth is simulated numerically.
【學(xué)位授予單位】:重慶大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:TU375.1
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