Study On Shear Behavior Of Short-limb Shear Wall Coupling Beams Strengthened By CFRP Network High Performance Composite Mortar

In order to study the seismic performance of short-limb shear wall and post-earthquake reinforcement,for the short-limb shear wall coupling beam with insufficient shear performance,this paper designs two "T with beam" according to the 1:3 scale ratio."Model cross-section short-limb shear wall model,the same test piece is firstly loaded with the same degree of pre-damage,then CFRP mesh layer number is used as the variable,CFRP net enhanced high-performance composite mortar combined with mechanical anchoring method for seismic damage coupling beam The U-shaped bag is reinforced,and the quasi-static test is carried out on the reinforced test piece.The bearing capacity,failure characteristics,ductility and energy dissipation performance of the test piece before and after reinforcement are analyzed.The values of the reinforced test pieces are calculated by ANSYS software.The simulation is compared with the experimental results.Finally,the theoretical calculation formula for the bearing capacity of the reinforced beam is derived.The main research conclusions of the full text are as follows:(1)It was found through experiments that the seismic performance of the reinforced test piece was significantly improved compared with the original test piece,including its ductility,hysteresis performance and energy consumption performance,and also delayed the rate of stiffness degradation of the test piece;The ultimate bearing capacity of the original CFRP-reinforced specimens increased by 27.9% and 58.1% respectively.Regardless of the energy consumption performance and the improvement of the ductility of the specimens,the overall reinforcement effect of the two layers is better than that of the first layer.It is more favorable for earthquake resistance;after the original specimen is reinforced by CFRP net,the stress is redistributed and transferred to the joint between the beam and the web.The failure mode of the coupling beam is transformed from the original brittle shear failure to the ductile shear with good ductility.Destroyed with bending.(2)Using ANSYS software to carry out finite element modeling of the reinforced specimens,and compare the numerical simulation bearing capacity,hysteresis curve and skeleton curve with the test results.The results show that the simulation results are in good agreement with the experimental results.The results are slightly different and the error range is reasonable.On the whole,the simulation results are more reliable.At the same time,the stress cloud map and the crack development map of the model are analyzed,and the simulation is found to be in good agreement with the test.(3)Through the exploration of the construction process of the CFRP network U-shaped bag reinforcement method,the construction process suitable for the actual project is summarized and summarized,which provides guidance and reference for the application of the reinforcement project.(4)According to the principle of "equal area",the CFRP net is equivalently processed,and the theoretical calculation formula of the bearing capacity of the reinforced beam end is derived.The theoretical,simulated and experimental values of the bearing capacity of the reinforced beam are compared and analyzed.The difference between the results shows that there is a slight difference between the three,and the error range is reasonable,among which the simulation value is the largest,the experimental value is the second,and the theoretical value is the smallest;the theoretical calculation result is conservative,partial safety,and has certain bearing capacity.Reserves have certain design reference value for engineering designers.