STRENGTHENING OF REINFORCED CONCRETE BEAMS WITH SHORT LAP SPLICES
Oral Presentation
Paper ID : 1179-ICASGE (R1)
Authors
1Professor, Faculty of Engineering, Alexandria University, Egypt
2M.Sc. Candidate, Faculty of Engineering, Alexandria University, Egypt
3Lecturer, Faculty of Engineering, Alexandria University, Egypt
Abstract
Strengthening reinforced concrete beams with short lap splices has been investigated using various techniques. The main objective of these studies was to change the brittle failure mode to a ductile one and to achieve the original designed flexural strength. In this paper, a new technique has been tested by combining two promising techniques (jacketing with high-performance concrete (HPC) and near-surface mounted (NSM) flexural reinforcement). Seven specimens with a short lap splice length of 270 mm at the mid-span region were tested in flexure to examine the performance of the proposed technique. The test parameters were the dimensions of the concrete jacketing and the method of reinforcing using either near-surface mounted steel reinforcement bars or steel wire mesh. The test results showed that, whilst the spliced control specimens failed in a brittle manner due to the bond splitting of the main steel at the location of the lap splice, using the proposed methods has increased the ultimate load of the spliced beams and changed the failure mode to a flexural and ductile one. Ultimately, adequate ductility was obtained compared to the control specimen.
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