Evaluation of bond‐slip behavior of reinforcement in ultra‐high‐performance fiber‐reinforced concrete
Evaluation of bond‐slip behavior of reinforcement in ultra‐high‐performance fiber‐reinforced concrete
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DOI：
10.1002/suco.202000667
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发表时间：
2021-06
影响因子：
3.2
通讯作者：
Dan‐Dan Wang;Qianping Shi;Yi-Xia Wang;Shaobo Kang
中科院分区：
文献类型：
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作者：
Dan‐Dan Wang;Qianping Shi;Yi-Xia Wang;Shaobo Kang
超高性能纤维混凝土（UHPFRC）中钢筋的粘结强度对超高性能纤维混凝土受弯或受拉构件的开裂后性能起着至关重要的作用。本文对超高次预应力混凝土（UHPFRC）中钢筋的粘结强度进行了分析研究。对修正的fib模型、Marchand模型和本文提出的模型进行了分析比较，并给出了显式方程。与试验数据的比较表明，所提出的模型和显式方程可以评估钢筋的粘结滑移性能具有良好的精度。Marchand模型在不同的荷载水平下显示出与所提出的模型相似的粘结滑移行为预测，而修改后的fib模型仅在钢筋在拉伸下几乎屈服时才准确。嵌入钢筋发展其屈服和极限强度所需的嵌入长度也可以从分析方法和显式方程计算。
Bond strength of steel reinforcement embedded in ultra‐high‐performance fiber‐reinforced concrete (UHPFRC) plays a vital role in the post‐cracking behavior of reinforced UHPFRC members in flexure or tension. This paper presents an analytical study on the bond strength of steel reinforcement in UHPFRC. Three different bond‐slip models, namely the modified fib model, Marchand model and the proposed model are compared in the analytical method and explicit equations are also proposed. Comparisons with test data suggest that the proposed model and explicit equations can evaluate the bond‐slip behavior of reinforcement with good accuracy. Marchand model shows similar predictions of bond‐slip behavior to the proposed model at different load levels, whereas the modified fib model is accurate only when the reinforcement nearly yields in tension. The embedment length required for embedded reinforcement to develop its yield and ultimate strengths can also be calculated from the analytical method and explicit equations.