The Effect of Previous Damage on the Effectiveness of FRP-Jacketing for Seismic Repairs of RC Structural Members

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Title: The Effect of Previous Damage on the Effectiveness of FRP-Jacketing for Seismic Repairs of RC Structural Members

Author(s): G. E. Thermou, S. P. Tastani and S. J. Pantazopoulou

Publication: Special Publication

Volume: 275

Issue:

Appears on pages(s): 1-20

Keywords: Jacketing, fiber reinforced polymers, predamaged, repair, retrofit

Date: 3/1/2011

Abstract:
Review of previous experiments on brittle R.C. columns through FRP jacketing illustrates that the efficiency of FRP jacketing in strengthening applications is superior to that which is observed when jacketing is used as a repair means. Actually, performance of the repair appears to be related to the state of damage along the anchorage or lap splice of primary reinforcement sustained in the initial phase and whether these defects have been corrected or not, by additional measures such as concrete replacement in cases of cracked cover or by epoxy injections along the damaged anchorages, prior to FRP jacketing. Surprisingly, this type of repair proves more effective in elements that have failed in a brittle manner rather than in cases that have undergone extensive yielding; the reason for that is that brittle failure along the member length occurs before the anchorage of the reinforcement has sustained excessive yield penetration, which cannot be avoided in ductile member behavior. This issue is explored systematically through evaluation of the collective experimental evidence from tests on columns repaired with FRP jacketing after having sustained damage under combined axial compression and cyclic lateral displacement reversals.