| Concrete-filled steel tubular column connected with composite girder by single bolt and end plate has the advantage of higher strength, lower story drift ratio and better seismic performance. These advantages facilitate its better use in fabricated steel structure. With experiments and theoretical analysis, this dissertation does research on seismic performance of composite frame consisting of concrete-filled steel-tube column and steel-concrete composite beam. Main contents include:(1) A horizontal low-cycle experiment has been conducted on a single-span frame with two stories to study the performance of semi-rigid joint. The frame mainly includes concrete-filled steel-tube column and steel-concrete composite beam. Several indexes including load(P)-displace(Δ) curve and hysteric loop are emphasized considering effect of slab.(2) Two FEM models were established respectively. One is a model in which column is even with the composite girder. The other is an extended end plate.Moment(M)-rotation(θr) curve was acquired under the condition of static load and low-cycle load respectively. Furthermore, non-linear whole-course analysis has been conducted aiming at composite joint which is even with column and the joint of extended end plate.(3) Simplified frame model has been created with different column-beam joints. Influence of various M-θr relations on bearing capacity, energy dissipation and lateral drift of composite frame has been discussed in this part.(4) FEM models with bar model is created to study seismic performance. Different earthquake waves were chosen to consider the effect of height and joint rigidness on natural vibration period and seismic response. |
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