Study On Seismic Performance Of New Precast Shear Wall Structure Before And After Strengthened By CFRP Grids-ECC

In this paper,the seismic performance of the new precast shear wall structure is studied.Two new Precast shear wall structures with a scale ratio of 1: 3 are subjected to repeated low-cycle loading tests.Stop loading at the limit of damage,analyze the damage location and failure mode,and develop a scheme to reinforce them with CFRP grid-ECC.Reinforce the existing damaged the new Precast shear wall structures according to the reinforcement scheme.After the reinforcement is completed,low-cycle repeated loading test is performed on the two test pieces again.The seismic performance of the specimens reinforced by CFRP grid-ECC is studied,and the reinforcement mechanism of two reinforcement materials of the reinforcement layer is analyzed and studied.Specifically,this article mainly studies from the following aspects:(1)Compare and analyze the failure morphology,hysteresis curves,skeleton curves,stiffness degradation curves,ductility performance,energy consumption capacity,steel bar and CFRP stress-strain curves obtained from the test before and after strengthening,and study the new precast shear wall The seismic performance of the structure before and after strengthening,and the influence of the strengthening method proposed in this paper on improving the seismic performance of the specimens are analyzed.(2)The finite element analysis software ANSYS was used to numerically analyze the test specimens before and after strengthening,and the simulation results of the test specimens' bearing capacity,hysteresis curves and skeleton curves were compared with the test results.(3)Using the formula derived from the theory of this paper,the theoretical calculations of the bending capacity and shear capacity of the beam end of the new precast shear wall structure strengthened by CFRP grids-ECC are calculated.The results of theoretical calculations are compared and analyzed with test results and simulation results.