Seismic Response of Prestressed Self-Centering Moment-Resisting Frames

Seismic Response of Prestressed Self-Centering Moment-Resisting Frames

Blog Article

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, Priming Tools 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 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 dissipation ratio reached 0.808.Seismic analysis results Shorts 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.