Bond Stress Distribution of Steel-FRP Composite Bar Coral Concrete Beam Drawing
To study the bond stress distribution of steel-fiber reinforced polymer(FRP)composite bar(SFCB)in coral concrete,a beam pull-out test method was adopted to pull out different diameters of SFCB and carbon fiber reforced polymer(CFRP)reinforced coral concrete,and used fiber Bragg grating(FBG)sensing technology to dynamically monitor the stress distribution changes of the reinforcement material.The results of the study show that both SFCB diameter and steel core diameter affect the shape of load-slip curves.The stirrup reinforcement significantly improves the initial bonding stiffness of the reinforcement material and the strain at the loading end of the SFCB fiber layer.Stirrups to a certain extent enhance the bonding of threaded steel cores,but have little effect on the bonding of smooth round steel cores.The distribution of bond stress after SFCB yielding differs significantly from that before yielding,and the stress transfer phenomenon is more pronounced after the steel core is yielded.Due to the high elastic modulus of the steel core,the bonding stress at all points of the SFCB fiber layer bonding section is greater than that of the CFRP reinforcement under the same load.
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