環(huán)境損傷作用下CFRP布加固混凝土梁力學性能研究
[Abstract]:Due to the influence of various environmental factors, engineering construction quality problems and service time, the performance of buildings is gradually declining. The reinforcement and restoration of damaged buildings can not only ensure that the damaged buildings can adapt to the development of human society, but also save the construction cost. However, most of the existing reinforcement methods of concrete structures have some defects. Carbon fiber reinforced composite (CFRP) has been widely used in building maintenance and renovation because of its high strength, corrosion resistance, fatigue resistance and many other excellent properties. Therefore, the mechanical properties of concrete beams strengthened with CFRP sheets under environmental damage are studied in this paper. The main contents are as follows: the experimental study on mechanical properties of concrete beams strengthened with CFRP sheets under environmental damage is carried out. The effects of reinforcement ratio and CFRP reinforcement amount and environmental damage on the failure form, bearing capacity, deformation capacity and crack development of the specimens are analyzed. The results show that there are two kinds of failure modes: 1 / CFRP brac fracture. Central crack development caused by the CFRP layout of the peeling damage. With the increase of reinforcement ratio, the bearing capacity of the specimen increases gradually, the increase of bearing capacity decreases, the velocity of stiffness degradation and the growth rate of sectional curvature decrease, the deflection of span, the width of crack and the average crack spacing decrease. With the increase of CFRP reinforcement, the bearing capacity and bearing capacity of the specimens increase gradually, the stiffness degradation speed and section curvature growth speed decrease, the mid-span deflection, crack width and average crack spacing decrease. With the increase of environmental damage, the bearing capacity and bearing capacity of the specimen decrease gradually, the stiffness degradation speed and section curvature increase, the deflection of span, the width of crack and the average crack spacing increase. The results of strain analysis show that the cross section strain distribution measured along the beam height accords with the assumption of plane section. At the beginning of loading, the strain growth trend of CFRP cloth is basically consistent with that of longitudinal steel bar, and the strain growth rate of CFRP cloth is gradually larger than that of longitudinal reinforcement strain growth rate after the specimen yield, and the CFRP cloth gradually bears the main tensile stress. With the increase of reinforcement ratio and CFRP reinforcement amount, the strain growth rate of longitudinal reinforcement and CFRP cloth slowed down, and the strain growth rate of longitudinal reinforcement and CFRP cloth increased with the increase of environmental damage. From the initial loading stage of the specimen to the failure of the specimen, the strain of the U-type CFRP cloth Anchorage hoop increases steadily and the strain of the U-type Anchorage hoop can effectively restrain the peeling between the CFRP cloth and the concrete. On the basis of experimental study, according to the strain relation of section and static equilibrium condition, considering the influence of reinforcement ratio and environment damage, the strength reduction coefficient and environmental damage coefficient of CFRP cloth are introduced. The formula of crack, yield and ultimate bearing capacity of concrete beams strengthened with CFRP sheets under environmental damage is derived, and the design method of flexural bearing capacity of normal section is given. According to the calculation model of bond slip crack of ordinary concrete beam, considering the reinforcement ratio and the influence of environment damage, the influence coefficient of CFRP sheet reinforcement and environment damage is introduced. The formula for calculating the cracks of concrete beams strengthened with CFRP sheets under the action of environmental damage is derived. According to curvature method, considering the influence of CFRP layer number and environmental damage, the influence coefficient of CFRP layer number and environmental damage coefficient is introduced, and the deflection calculation formula of concrete beam strengthened by CFRP cloth under environmental damage is deduced. The method of checking the deformation of concrete beams strengthened with CFRP sheets and the calculation formula of the width of U-type Anchorage hoop of CFRP cloth are given.
【學位授予單位】:安徽工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TU37
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