Shaking table test of a six-story self-centering reinforced concrete frame structure model
To study the seismic performance of multi-story self-centering frame structures,shaking table tests of a 1/4 scale six-story self-centering frame structure model were carried out.The dynamic characteristics of the structure and its dynamic response and damage evolvement were investigated under four seismic intensity levels ranging from intensity 7-frequent earthquakes to intensity 7-very rare earthquakes.The test results show that under frequent and designed basic earthquakes,there were no visible cracks and damages in the structure components.The structural damage increased with the increase of the PGA of the input ground motions,but the damages were mainly concentrated in the surface layer of concrete at the beam and column ends,and there were almost no damages occurred to the structural members,revealing the excellent seismic performance of the self-centering concrete frame structure.Under the intensity 7-rare earthquake,the maximum inter-story drift of the main structure was 1/62,and the joints of the self-centering frame began to open.Under intensity 7-very rare earthquakes,the opening of model joints became more pronounced.When the steel angles of joints yielded,the maximum residual drift of the main structure was only 1/2533,validating the excellent self-centering capability of the structure.
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