RESEARCH ON THE EFFECT OF INTERFACIAL BOND-SLIP PROPERTY ON FLEXURALPERFORMANCE OF CONCRETE BEAMS STRENGTHENED WITH NSM-FRP STRIPS

Abstract

Abstract: The concrete beam strengthened with near-surface mounted FRP strips(NSM-FRP strips) is simulated by finite element method using ABAQUS software, and the simulation method of reinforced beam considering the interface failure of FRP-concrete is proposed. In order to study the effect of interface bonding-slip performance on the bending behavior of the concrete beam strengthened with NSM-FRP strips, the spring2 nonlinear elements is used to simulate the bond-slip relationship of FRP-concrete interface. The flexural behavior of RC beams under different interface bonding relationships was recorded and compared. The results show that the bond slip of the FRP-concrete interface has a great influence on the bending resistance of the beam strengthened with NSM FRP and must be considered. The nonlinear spring connection between the interfaces can do a better job in simulating the bond-slip failure of the interface. When studying the performance of the reinforced beam under serviceability limit state, it is more convenient and accurate to use the linear spring connection to simulate the NSM FRP strengthened beam.

Key words: strengthened with NSM-FRP strips, flexural behavior of RC beams, spring element, interfacialbond-slip

CLC Number:

TB332

ZHANG Zhi-mei, HUANG Qing-bin, ZHAO Lei. RESEARCH ON THE EFFECT OF INTERFACIAL BOND-SLIP PROPERTY ON FLEXURALPERFORMANCE OF CONCRETE BEAMS STRENGTHENED WITH NSM-FRP STRIPS[J]. Fiber Reinforced Plastics/Composites, 2019, 0(10): 40-45.

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