Abstract:
Experimental research has been conducted at the Structures
Laboratory of the University of Ottawa to investigate the seismic performance
of FRP reinforced concrete structural elements. Large scale columns and
beams are being tested under simulated seismic loading. Fiber Reinforced
Polymer (FRP) reinforcement is being developed in the form of longitudinal
bars and transverse grids for use in new concrete elements in bridges
and buildings. Since, this kind of reinforcement shows linear stress-strain
characteristics up to failure and has low ductility, serious concerns
should be considered about their applicability to earthquake resistant
structures. The results of selected tests are summarized in this study,
with the assessment of their significance from seismic performance perspective.
Column and beam specimens were tested under lateral deformation reversals.
The members were reinforced with carbon FRP bars in the longitudinal direction
and carbon FRP grids in the transverse direction. Both the columns and
the beams sustained a minimum of 2-3% lateral drift ratios, meeting seismic
drift limitations of most building codes. Test results indicate that FRP
reinforced concrete elements exhibit reduced stiffness and softened response
because of the lower elastic modulus of FRP bars. This may suggest reduced
spectral values associated with longer vibration periods, as well as increased
deformability, resulting in seismic resistant structures for which elastic
design approach with sufficient deformability may be appropriate.
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