Study On Seismic Performance Of CFRP Reinforced Masonry Infilled Frame With Seismic Damage

A large number of buildings may be damaged under the earthquake,Due to the construction site,the depth of quake’s epicentre,the dynamic characteristics of the building are different,Therefore,the earthquake damage is different.A simple and effective repair method can be adopted to restore the original seismic performance of damaged buildings,which has great economic and practical needs.In order to study the feasibility of repairing and strengthening the seismic damage frame structure,In this paper,the three damage frame left by the previous test of this group——bare frame,rigid connection masonry infilled frame,flexible connection masonry infilled frame,and a intact bare frame were reinforced with CFRP.The following work has been carried out mainly for these frame:(1)According to the " Code for design of strengthening concrete structure "CFRP reinforcement scheme of these frame was designed,then the reinforcement of CFRP was carried out according to the scheme.,and the same infill wall as before was built.(2)Low cycle reciprocating load test was used for the four CFRP reinforcement frame,the test process and phenomena of each frame were recorded in detail.The hysteresis curve,skeleton curve,energy dissipation curve and so on of each frame after reinforcement were obtained.Through the comparison and analysis with the test data of the original specimen,the reinforcement effect of CFRP was evaluated comprehensively and objectively.(3)Based on the software OpenSees,Simulation analysis of four CFRP reinforcement frame was carried out,the beam and column of the frame were simulated with nonlinear beam and column element based on displacement,the role of the infilled wall was simulated by twoNodeLink element at two diagonals of the infilled frame.For flexible connections infilled frame structures,elastic springs was used between frame and filled wall to simulate elastic cushioning of rubber,the simulation results and experimental curves have higher degree of agreement,The rationality and applicability of the model were verified.Through the comparison and analysis with the test data of the original specimen,the following conclusions are drawn:(1)The initial damage will reduce the lateral stiffness after CFRP reinforcement at the initial stage of structural stress.(2)Bare frame and flexible connection masonry infilled frame structure can effectively improve the peak bearing capacity and lateral stiffness of the structure after CFRP reinforcement,but the increase of peak load and lateral stiffness of CFRP reinforced rigid connection masonry infilled frame structure is not obvious.(3)The ductility coefficient and energy dissipation capacity of each frame reinforced by CFRP have been greatly improved,slower stiffness degradation is obtained,the damage degree of the frame is significantly reduced,and the seismic performance is significantly improved.