Experimental Study on Seismic Retrofit of R/C Frame with Damping Bracing

Abstract eng:
The experimental study on seismic retrofit of the reinforced concrete (R/C) frame with damper bracings was carried in this paper. Two test models were cast according to one kind of frame in which gravity load carrying beams were arranged in transverse direction of the building and possessed lower lateral strength in longitudinal direction. One of the models called energy dissipation frame was retrofitted with two supplemental viscous damper bracings in each inter-story in longitudinal direction. Both models were arranged on the shaking table and simultaneously excited in longitudinal direction by simulated earthquake motions with different peak ground acceleration (PGA). The test results showed that the ratios of the inter-story damper forces to the inter-story shear forces ranged from 0.20 to 0.70 and the equivalent damping ratios ranged from 0.14 to 0.28 for the energy dissipation frame. The accelerations, inter-story displacements and inter-story shear forces were greatly reduced comparing to the model without damper bracings. Besides, the vibration in resonance was prevented because of the high damping performances of damper bracings. Given the same inter-story displacements, the energy dissipation frame was tested the twice PGA of the frame without damper bracings. It is verified that the seismic performances of this kind of frame can be improved by the damper bracings.

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