Cyclic bond behavior and bond stress – slip model of steel strands in steel fiber reinforced concrete

被引：0
|
作者：
Zhao, Jun [1 ,2 ]
Kou, Zhikun [1 ]
Li, Xiaopeng [1 ]
Liu, Xuefeng [1 ]
机构：
[1] School of Civil Engineering, Zhengzhou University, Zhengzhou,450001, China
[2] School of Civil Engineering and Transportation, North China University of Water Resources and Electric Power, Zhengzhou,450045, China
来源：
Construction and Building Materials | 2024年 / 449卷
关键词：
To study the bond performance of steel strands in steel fiber reinforced concrete (SFRC); bonding tests under monotonic and cyclic loads were performed on the specimens with different steel fiber volume fractions (SFVFs); bond lengths; nominal diameters of steel strands and SFRC strengths. The results showed that the relative rotation between the steel strand and SFRC occurred when the steel strands were vertically pulled out from SFRC due to the smooth and continuous helical shape of the steel strands. For the specimens with the same parameters; the maximum bond stress under cyclic load decreased by 1.67–22.88 % than that under monotonic load. The maximum bond stress under cyclic load increased with the increasing SFVFs or SFRC strength. Notably; the maximum bond stress under cyclic load also increased with the increasing bond length or diameter of steel strands; significantly different from that of ordinary ribbed steel bars and FRP bars. The cumulative energy dissipation (CED) of bond specimens increased with the diameter of steel strands and SFRC strength. Besides; the SFVFs had a positive effect on the CED; but simultaneously increasing diameter of steel strands would weaken the positive effect of SFVFs; and simultaneously increasing bond length had no obvious on the CED. Finally; a bond stress – slip model of steel strands in SFRC was established; suitable for calculating bond stress – slip curves under random and complicated loading schemes. By comparing the calculation and test results of bond stress – slip curves; it was proved that the proposed model had an acceptable accuracy and could describe the influence laws of SFVF; bond length; nominal diameter of steel strand and SFRC strength well. © 2024 Elsevier Ltd;
D O I：
10.1016/j.conbuildmat.2024.138405
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