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Flexural Strengthening of Masonry Walls with External Composite Bars
Published
Author(s)
K K. Bajpai, Dat Duthinh
Abstract
The strengthening of epoxy with milled glass fibers allows full strength development of #2 glass FRP bars in 200 mm or half a concrete masonry unit length. This fiber-reinforced epoxy should be effective for other types of bars as well.With full anchorage assured, FRP bars provide an efficient method of strengthening masonry walls against out-of-plane bending. Three narrow (2.85 m H 0.40 m H 0.20 m), grouted, concrete masonry beams reinforced to 28 % of balanced ratio and four wide (2.85 m H 0.80 m H 0.20 m) beams reinforced to 41 % of balanced ratio were tested in four-point bending. All seven beams exhibited consistent flexural behavior, characterized by tensile failure of the reinforcement followed by crushing of the masonry at an average ratio of span to maximum deflection of 42.The ACI equations predict the flexural strength of these FRP externally reinforced concrete masonry beams with a comfortable factor of safety (mean = 1.36, coefficient of variation = 6 %). There was no difference in behavior between reinforcement parallel or perpendicular to the mortar bed joints. The unexpected shear failure of one FRP reinforced, ungrouted beam needs further investigation.
Bajpai, K.
and Duthinh, D.
(2003),
Flexural Strengthening of Masonry Walls with External Composite Bars, 9th North American Masonry Conference, Undefined
(Accessed August 31, 2024)