Experimental Study on Seismic Performance of Frame Joints Strengthened by Self-Compacting Concrete Considering the Influence of Interface Treatments

Abstract

This paper produced four frame joints strengthened by self-compacting concrete and one unstrengthened joint for comparison. Take MTS servo loading system of static test for the frame joints under secondary load，to study the influence of different interface treatments for the seimic performance. The interface of the four strengthened joints respectively using roughening and grooving with different grooving density. The results of the damage process, strain of the old steel and new steel, the load -displacement hysteresis loops was analyzed，and it was found that the cooperational performance of the old concrete and new concrete was good when using self-compacting concrete to strengthen the frame joints with the interface treatments roughening and grooving. Considering the impact of the interface treatment, the ultimate strength, displacement, and displacement ductility coefficient of the reinforced joints etc. were slightly increased. And the the more the grooving density was, the better the strengthening effect was, which could be considered in the design of strengthening as its interface treatment.