CFRP Repairing System at Openings in Reinforced Concrete T-Beams Cracked by Impact Loads

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Title: CFRP Repairing System at Openings in Reinforced Concrete T-Beams Cracked by Impact Loads

Author(s): Nazar Oukaili and Abeer Al-Shammari

Publication: Special Publication

Volume: 327

Issue:

Appears on pages(s): 2.1-2.20

Keywords: CFRP strengthening, finite element, impact loading, multiple web openings, RC beams

Date: 11/1/2018

Abstract:
Synopsis: This study presents the experimental and theoretical response of 10 simply supported reinforced concrete T-beams with multiple circular web openings to concentrated static and impact loading. Carbon fiber reinforced polymer (CFRP) was used for strengthening some of the beams with web openings. Five beams were exposed to static loading up to failure while the other beams were subjected to repeated impact loading until the shear crack width reached 0.3 mm (0.012 in.). The residual static strength of these beams was then determined. Test variables included the number of web openings and the height of weight drop during impact tests. Static loading test results indicated that unstrengthened beams with four and six openings have strength less than those without openings by 30% and 41%, respectively. However, strengthening using CFRP installed on beams web around openings resulted in an increase in the strength capacities ranging between 32% and 93%. Impact load data indicated that the beam with four openings did not show a significant increase in midspan deflections as compared with the specimens with no web openings. In comparison, the beam with six openings showed a 75% increase in the maximum midspan deflections compared with the beam with no web openings.