Experimental study on seismic damage of T-shaped concrete filled steel tubular column and steel beam frame joint with floor slab
In order to study the seismic performance of T-shaped concrete-filled steel tubular(CFST)column-steel beam frame joints with floor,six T-shaped CFST column-steel beam frame joints with different beam-column linear stiffness ratios and axial compression ratios are fabricated and tested under low cyclic loading.The test results show that the ductility and energy dissipation capacity of the specimens decrease significantly under high axial compression ratio,and the stiffness and skeleton curve are basically unchanged.With the increase of beam-column linear stiffness ratio,the stiffness of the specimen decreases,and the ductility and energy dissipation capacity decrease first and then increase.The slab has a certain improvement on the seismic performance of the specimen under positive loading,and has little effect under negative loading.The hysteretic curves of all specimens are plump spindle and the average equivalent damping coefficient of each specimen is 0.270,which is much larger than that of ordinary reinforced concrete joint specimens,indicating that the T-shaped CFST column-steel beam frame joint with floor slab has good seismic performance.
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