Study On Seismic Behavior Of RC Column-steel Beam Hybrid Structure With Semi-rigid Connections Of The Beam-to-column

Reinforced concrete column-steel beam hybrid structures exert the advantages of concrete and steel well. Joints with RC columns and steel beams which may be prefabricated have the same semi-rigid characteristics to the semi-rigid connections in steel structures. To study on the semi-rigid characteristic of RCS hybrid structures, this paper conducted a research on the semi-rigid connections in RCS hybrid structures on the basis of experimental results.This paper put forward a moment-rotation curve model which can be used to some RCS hybrid structures which seems to the RCS hybrid structures in this paper. On the basis of moment-rotation curve model, this paper designed three RCS hybrid frames with semi-rigid connections, and take the Pushover analysis and the dynamic elastic-plastic time-history analysis on these frames in SAP2000. At the same time, the Pushover analysis and the dynamic elastic-plastic time-history analysis of three RCS hybrid frames with rigid connections and three RCS hybrid frames with BRBs with semi-rigid connections were taken, to study on the seismic performance of RCS hybrid structures with semi-rigid connections and the effect of the semi-rigid connections on the RCS hybrid frames.In this paper, the main conclusions are as follows:1. The ductility and energy consumption of the specimen with semi-rigid connections in this paper are better than the specimen with rigid connections, which shows that RCS hybrid structures with semi-rigid connections have a better seismic performance.2. The results calculated by the moment-rotation curve model put forword in this paper coincide with the experimental results well. The moment-rotation curve model could reflect the semi-rigid characteristic of some RCS hybrid structures which seems to the RCS hybrid structures in this paper well.3. P-? could effect the sequence of plastic hinges of RCS hybrid frames with simi-rigid connections. P-? has little influence on the deformation of the frames when the first plastic hinge appears, but effect the deformation when the structure destroies, the deformation of the frames increase fast.4. The joints with semi-rigid connections weaken the stiffness of the whole frame, which makes the drift of every floor and the inter-story drift ratio of every floor of the semi-rigid frames is larger than the rigid frames', the shear of every floor of the semi-rigid frames is smaller than the rigid frames', the seismic performance of the semi-rigid frames is better than the rigid frames'.5. The joints with semi-rigid connections have little influence on the frames' stress mechanism and the state of deformation and failure.6. BRBs could weaken the earthquake response of RCS hybrid frames with semi-rigid connections effectively by hysteretic energy. Adding BRBs to the frames could resolve the effect of the joints with semi-rigid connections on the seismic performance of the frames.7. The joints with semi-rigid connections weaken the stiffness of the whole frame, which makes the deformation of the frame larger. While, adding BRBs(damping) could weaken the deformation earthquake response of the frame well, which is agree with the weaken theory.