CFRP板條嵌入式加固RC梁受剪性能研究
[Abstract]:Fiber reinforced composites (Fiber Reinforced Polymer / plastic (FRP) has been widely used in the field of civil engineering reinforcement because of its advantages of light weight, high insulation, high mechanical strength, less recycling, corrosion resistance and so on. Embedded FRP reinforcement technology is a new reinforcement method put forward by foreign scholars in recent years, that is, slotted in the surface of concrete structural members, FRP slab or reinforcement is put into it. The two materials are bonded to achieve the purpose of common force. At present, the embedded FRP reinforcement technology mainly focuses on the research of bending resistance, and there are still many problems to be solved for shear reinforcement. In this paper, the finite element model of four beams (one contrast beam and three test beam) with available test data is established, and the simulation results are compared with the experimental data to verify the accuracy of the finite element model. Based on the same reinforcement quantity of CFRP slab, two contrast beams and 12 strengthened beams are established in this paper. The failure mode, shear bearing capacity and stiffness of strengthened beams are studied by using CFRP slab embedding angle, shear span ratio and slot spacing as parameters. Strain expansion analysis of stirrups and CFRP. Based on the existing research results of effective strain of FRP strengthened with embedded CFRP during the exfoliation of rubber layer, the formula of shear capacity of RC beams strengthened by embedded CFRP is derived based on the truss model. Based on the finite element analysis, the shear bearing capacity and stiffness of the beams strengthened with the same amount of CFRP slab are improved in different degrees, but the increase of the crack load of the strengthened beams is not particularly obvious. Under the same slotted mode, the shear bearing capacity of the reinforcement method with 45 擄embedded angle is the highest, and the effect of 90 擄angle reinforcement is the worst, and the reinforcement effect is more obvious with the increase of shear span ratio. The efficiency of CFRP is higher and the bearing capacity of CFRP is higher. Through the load-strain curve of stirrups, the cracking load of inclined cracks can be well reflected. In the early stage of loading, concrete and stirrups are working together. At this time, the action of CFRP slab is not obvious and tends to elastic stage. When the oblique crack appears, the contribution of concrete weakens, and the stirrups CFRP formally enters the working state, and the strain increases sharply. By comparing the calculated values of shear bearing capacity of embedded CFRP strengthened beams with the simulated values, it is found that the two data are in good agreement with each other.
【學(xué)位授予單位】:吉林建筑大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TU375.1
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