Seismic Performance of New-Type Precast Segmental Three-Column Pier
This study presents a new-type precast segmental three-column pier,which has better self-centering capacity than the conventional precast segmental three-column pier(equating a cast-in-place pier).The center column of the new-type three-column pier is connected with the pile cap via a grouted corrugated pipe(similar to a cast-in-place connection),while the other two columns are connected with the pile caps via prestressing tendons(similar to a rocking connection).The grouted corrugated pipe connection at the center column can control the structural deformation during a seismic event,and at the same time dissipate seismic energy.The prestress connections at the side columns allow the piers to rock under seismic forces,so as to reduce the residual deformation and enhance the self-centering capacity of the piers,and assist seismic energy dissipation.Finite element models of the new-type three-column pier with and without energy-dissipating reinforcement as well as a conventional three-column pier were established for seismic calculation.Key seismic performance indicators are analyzed,including the hysteresis curves,skeleton curves,energy dissipation capacity,residual displacements,failure phenomena.It is demonstrated that compared with the conventional three-column pier,the new-type three-column pier without energy-dissipating reinforcement exhibits better ductility,but poor energy dissipation capacity and small residual displacements.The new-type three-column pier with energy-dissipating reinforcement displays sound ductility,similar energy dissipation capacity to the conventional three-column pier,and small residual displacements,indicating superior seismic performance.
precast segmental pierthree-column piergrouted corrugated pipeenergy-dissipating reinforcementseismic performancefinite element method
万方数据
维普
