Precast Prestressed Portal Frames with Corrugated Steel Panel Dampers

Abstract eng:
This research aims to propose economical structural system which reduces seismic damage and needs no or little repair combing precast prestressed concrete (PCaPC) structures and corrugated steel panel dampers. PCaPC structures show elastic behaviors and very little damage even after experiencing large deformation. However, the lateral displacement under earthquakes tends to be large because of their low stiffness. Corrugated steel panels improve their seismic performances with high capabilities of dissipating energy as dampers even after yielding. This system is economical by using ordinary materials and existing construction technologies. In an experimental study, seismic loading tests were conducted on four portal frames with corrugated steel panel dampers. Experimental variables were the types of frame structures (RC, bonded PCaPC, and unbonded PCaPC) and the yield strength of corrugated steel panels (100MPa, 225MPa, and 300MPa). All PCaPC frames showed much smaller residual deformations and less damage than RC frames. Energy dissipation was almost identical for two types of steel. In an analytical study, it was proved that superposition of hysteretic loops of frames and dampers agreed well with experimental results. Equivalent viscous damping ratios and residual displacements were well simulated by using simple M-θ model.

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