Test Study And FEM Analysis On Hysteretic Behavior Of One Bay RC Frame-clad Brick Infill Wall With Seismic Retrofit Using Steel Strips

At present, the hysteretic Behavior of one bay RC frame structure is poorer.By analyzing the state of the art of study on many reinforcement methods, one way which strengthened with steel strips was proposed in order to change the structure system and improve the seismic performance.To investigate hysteretic Behavior of RC frame-clad brick infill wall with seismic retrofit using steel strips,5 specimens (including one notrofit, three retrofit earily and one retrofit late) which represent one primary school Building of Kunshan was desigred by 1/2 scale and tests were conducted under cyclic loading laterally ,the load-displacement curves and the failure modes were derived. The test results showed,seismic retrofit using steel straps could soundly develop its effect with large deformance and improve the seismic performance of the structure, such as Bigger load-carrying capacity and Better lateral-stiffness degradation pattern.Based on the results of the test, FEM analysis was used to analyze RC frame-clad brick infill wall strengthened with CFRP plates. Numerical computation program was employed to simulate the mechanical behavior of different kinds of strengthened structures. According to the calculate and experiment results, the practical formula to calculate the ultimate shearing capacity of strengthened structures was proposed by simulating the steel strips with a model of tensile and compressive bar system.Comparison between the results of calculation with proposed equation and the test results or the numerical simulation results for strengthened structures shows that the equation is correct and applicable.