Experimental and Numerical Analysis of RC Two-Span Slabs Strengthened With NSM CFRP Laminates

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Title: Experimental and Numerical Analysis of RC Two-Span Slabs Strengthened With NSM CFRP Laminates

Author(s): G. Dalfre and J.A.O. Barros

Publication: Special Publication

Volume: 275

Issue:

Appears on pages(s): 1-20

Keywords: CFRP, Continuous RC slabs strips, Flexural strengthening, NSM, Load carrying capacity

Date: 3/1/2011

Abstract:
Two types of arrangements of NSM CFRP laminates for the flexural strengthening of continuous RC slabs were investigated, one with CFRP laminates exclusively applied in the intermediate support, H series (hogging region), and the other with laminates applied in both the hogging and sagging regions (HS series). In the H series the increase of load carrying capacity was limited to 10% (for a target value of 25%) and 17% (for a target value of 50%), and the moment redistribution capacity () did not attain the target value (30%) and has decreased with the increase of the CFRP strengthening ratio. In the HS series the increase of load carrying capacity has exceeded the target value (25%) and the moment redistribution capacity was not significantly affected. For the HS series the flexural strengthening effectiveness was limited by the detachment of the concrete cover that includes the laminates, at the hogging region.