Research on S-N Curves of 930 MPa Large-Diameter High-Strength Cold-Rolled Threaded Prestressed Steel Rebars
Considering the problem of uneven cross-section of material of large-diameter steel rebars and the stress concentration at the root of thread rebars,the paper carried out an experimental study of uniaxial tensile and fatigue properties of materials at different positions of the cross-section of 930 MPa grade 75 mm diameter high-strength cold-rolled threaded prestressed steel rebars,and carried out a finite element numerical simulation of full-size steel rebars under uniaxial tensile to analyze the stress concentration at the thread root.The results showed that there was no yield platform in the stress-strain curves of large-diameter high-strength cold-rolled threaded prestressed steel rebars under uniaxial tensile,and there were significant differences in the cross-sectional material properties of the 930 MPa grade 75 mm diameter steel rebars.There was an obvious stress concentration at the thread root,and the stress concentration coefficient was about 1.74,and the fatigue properties was very close to the Z11 curve considering the size effect in the Steel Structure Design Standard(GB 50017-2017)when the average stress was 700 MPa.
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