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Open AccessFeature PaperArticle

Repair of Heavily Damaged RC Beams Failing in Shear Using U-Shaped Mortar Jackets

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Reinforced Concrete and Seismic Design of Structures Laboratory, Civil Engineering Department, School of Engineering, Democritus University of Thrace, 67100 Xanthi, Greece
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Structural Science and Technology Division, Architectural Engineering Department, School of Engineering, Democritus University of Thrace, 67100 Xanthi, Greece
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Author to whom correspondence should be addressed.
Buildings 2019, 9(6), 146; https://doi.org/10.3390/buildings9060146
Received: 4 June 2019 / Revised: 12 June 2019 / Accepted: 13 June 2019 / Published: 14 June 2019
The effectiveness of slightly reinforced thin U-shaped cementitious mortar jacketing for the repair of damaged shear-critical reinforced concrete beams is experimentally investigated. The test project includes two parts. In the first one, five concrete beams over-reinforced against flexure and under-reinforced against shear with different ratio of closed stirrups were initially subjected to monotonic loading until failure. The initially tested beams have been designed to fail in shear after wide diagonal cracking and to exhibit various strength and deformation capacities along with different levels of damages. In the second experimental part, the heavily damaged beams were jacketed with mild steel small diameter U-shaped transverse stirrups and longitudinal reinforcing bars. The retrofitted specimens using the proposed jacketing technique were tested again following the same four-point-bending load scheme. Based on the overall performance of the beams, it is deduced that the shear strength and deformation capability of the jacketed beams were substantially increased compared to the corresponding capacities of the initial beams. Further, although all beams failed in a shear abrupt manner, the retrofitted ones exhibited reduced brittleness and higher deflections at failure up to six times with respect to the initially tested specimens. The level of the initial damage influences the efficiency of the jacketing. Additional test data derived from relative shear-damaged beam specimens and retrofitted with similar thin jackets is also presented herein in order to establish the effectiveness of this repair system and to clarify the parameters affecting its structural reliability. Comparisons indicated that jacketed beams can alter the failure mode from brittle shear to ductile flexural under certain circumstances. View Full-Text
Keywords: reinforced concrete (RC); structural reliability; repair; rehabilitation; beam; shear; experimental testing reinforced concrete (RC); structural reliability; repair; rehabilitation; beam; shear; experimental testing
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Chalioris, C.E.; Kytinou, V.K.; Voutetaki, M.E.; Papadopoulos, N.A. Repair of Heavily Damaged RC Beams Failing in Shear Using U-Shaped Mortar Jackets. Buildings 2019, 9, 146.

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