Seismic Response of Prestressed Self-Centering Moment-Resisting Frames

Seismic Response of Prestressed Self-Centering Moment-Resisting Frames

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This paper aims to examine the seismic response of prestressed self-centering moment-resisting frames (PSC-MRFs) based on concrete-filled double steel tubular (CFDST) columns and RC beams.The beam of this novel connection is divided into two parts, connected by bolts and tendons, and the beam includes a gap opening feature, which could be regarded as a normal single beam in the field.Cyclic loading analysis was performed on one-story frames with different initial parameters arranged in adjacent bays.Nonlinear dynamic analysis was conducted on a merlin wizard costume six-story frame under two seismic hazard levels.The cyclic loading analysis showed favorable self-centering performance of the frame even when the hysteretic energy virginia mill works tobacco road acacia dissipation ratio reached 0.

808.Seismic analysis results showed that compared with the in situ reinforced concrete frame, PSC-MRFs generally had similar maximum inter-story drifts under fortification earthquakes, but the residual inter-story drifts were reduced by 33%; under rare earthquakes, the maximum inter-story drifts and residual inter-story drifts of PSC-MRFs were reduced by 22% and more than 90%, respectively.In the adjacent bays on the same story of PSC-MRFs, connections with smaller imminent moments of gap opening opened earlier under earthquake, and the maximum opening angle was larger.The general seismic performance and self-centering of PSC-MRFs was significantly more advantageous than that of in situ reinforced concrete frames.