Seismic Performance Analysis of Frames with Cantilever Beam Segments Based on Connection Simplification Theory

To study the seismic performance of frames with cantilever beam segments in different connection types， 12 planar frames with four different connection types were designed. A simplified model of these frames was established based on the beam-column connection simplification theory. First， a simplified model of the double-flanged plane frame from the literature was established， and quasi-static and quasi-dynamic numerical calculations were carried out. The results showed that the hysteresis curves， skeleton curves， and the maximum displacement of the column top were in good agreement with the experimental results. Based on the reliability of the simplified beam-column connection model， a dynamic time-history analysis of 12 framework simplified models was carried out by using ABAQUS software. By comparing the natural vibration periods， inter-story drift angles， column-top displacement time-history curves， and column-bottom shear time-history curves of the frame， the seismic performance of four types of cantilever beam-connected frames was analyzed. The results showed that the 6-story frame with the reinforced embedded connection with cantilever beam exhibited good seismic performance， but its energy dissipation capacity was poor， and the seismic performance decreased with the increase of the number of frames. The frame with the traditional butt connection and cantilever beam exhibited better seismic performance， but strengthening measures should be taken at the weak layer. There was little difference in seismic performance between the frames with embedded bolted connections and embedded bolt-welded hybrid connections. The energy dissipation at the connection was reduced by welding the flange between the cantilever beam and the main beam.