Combining EBR CFRP sheet with prestressed NSM steel strands to enhance the structural behavior of prestressed concrete beams
Document Type
Article
Publication Date
1-1-2021
Abstract
In this study, a combined strengthening technique is used to improve the flexural performance of prestressed concrete beams using CFRP sheets as EBR and prestressed steel strands as NSM. Seven prestressed beams were tested under four-point loading with one control specimen, one EBR CFRP sheet strengthened specimen, one NSM steel strand without prestress strengthened specimen and four specimens strengthened with a combination of EBR CFRP sheet and NSM steel strands prestressed from 0% to 70% of their tensile strength. The flexural responses and failure modes of the specimens were investigated and the variations due to the level of prestressing force in the PNSM steel strands were also assessed. A finite element model (FEM) was developed using ABAQUS to verify the flexural responses of the strengthened specimens. The test results revealed that the combined strengthening technique remarkably enhanced the flexural performance of the specimens. The serviceability, first crack, yield, and ultimate load capacities improved up to 44%, 49%, 55% and 70%, respectively when compared with the control specimen. The combined technique also ensured the flexural failure of the specimens with significant enhancement in stiffness and energy absorption. The results of the FEM model exhibited excellent agreement with the experimental results.
Keywords
Prestressed beams, Flexural behavior, EBR, NSM, PNSM, Combined technique, CEBNSM, CEBPNSM, Pre-stressed strengthening, FEM
Divisions
fac_eng
Funders
Universiti Malaya (GPF050A-2020)
Publication Title
Journal of Civil Engineering and Management
Volume
27
Issue
8
Publisher
Vilnius Gediminas Tech Univ
Publisher Location
SAULETEKIO AL 11, VILNIUS, LT-10223, LITHUANIA