Behavior and modeling of RC beams strengthened with NSM-steel technique
Document Type
Article
Publication Date
10-1-2023
Abstract
The reinforced concrete (RC) structures might need strengthening or upgradation due to adverse environmental conditions, design defects, modification requirements, and to prolong the expected lifespan. The RC beams have been efficiently strengthened using the near surface mounted (NSM) approach over the externally bonded reinforcing (EBR) system. In this study, the performance of RC beam elements strengthened with NSM-steel rebars was investigated using an experimental program and nonlinear finite element modeling (FEM). Nine medium-sized, rectangular cross-section RC beams total in number made up for the experimental evaluation. The beams strengthened with varying percentages of NSM reinforcement, and the number of grooves was assessed in four-point bending experiments up to failure. Based on the experimental evaluation, the load-displacement response, crack features, and failure modes of the strengthened beams were recorded and considered. According to the experimental findings, NSM steel greatly improved the flexural strength (up to about 84%) and stiffness of RC beams. The flexural response of the tested beams was simulated using a 3D non-linear finite element (FE) model. The findings of the experiments and the numerical analysis showed good agreement. The effect of the NSM groove and reinforcement on the structural response was then assessed parametrically.
Keywords
Crack characteristics, Finite element modeling, Flexural strengthening, NSM-steel
Divisions
sch_civ
Funders
University of Malaya High Impact Research Grant [Grant no. UM.C/HIR/MOHE/ENG/36]
Publication Title
Structural Engineering and Mechanics
Volume
88
Issue
1
Publisher
Structural Engineering and Mechanics
Publisher Location
PO BOX 33, YUSEONG, DAEJEON 305-600, SOUTH KOREA