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首页> 外文期刊>KSCE journal of civil engineering >Bond Behavior of Spiral Ribbed Ultra-high Strength Steel Rebar Embedded in Plain and Steel Fiber Reinforced High-Strength Concrete
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Bond Behavior of Spiral Ribbed Ultra-high Strength Steel Rebar Embedded in Plain and Steel Fiber Reinforced High-Strength Concrete

机译:螺旋肋超高强度钢筋在普通钢纤维增强高强混凝土中的粘结性能

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摘要

The bond behavior of spiral ribbed ultra-high strength (SRUHS) steel rebar embedded in plain high strength concrete (HSC) and steel fiber reinforced high strength concrete (SFRHSC) is experimentally studied using pull-out tests. The influencing factors of concrete type, embedded length, cover thickness and stirrup ratio are considered and the bond failure characteristics as well as the whole process of stress-slip behavior are analyzed. The research shows good anchorage ductility between SRUHS steel rebar and HSC. Since SRUHS steel rebars have continuous spiral bite teeth with concrete, the concrete in the rib dales is not easily sheared off, thereby leading to a reliable bond strength. Compared to specimens without steel fibers, steel fiber reinforcement can increase the ultimate bond strength, bond stiffness and residual strength. Meanwhile, it will also reduce the influence of cover thickness, stirrup ratio on the specimens with steel fibers. Finally, a prediction calculation for ultimate bond stress and an analytical model for bond stress-slip relation are proposed, which match well with test results.
机译:使用拉拔试验,通过实验研究了嵌入普通高强度混凝土(HSC)和钢纤维增强高强度混凝土(SFRHSC)中的螺旋肋超高强度(SRUHS)钢筋的粘结性能。考虑了混凝土类型,包埋长度,盖层厚度和箍筋比的影响因素,分析了粘结破坏特性以及应力-滑移行为的全过程。研究表明,SRUHS钢筋和HSC之间具有良好的锚固延性。由于SRUHS钢筋的混凝土具有连续的螺旋状咬合齿,因此肋槽中的混凝土不易被剪切掉,从而可提供可靠的粘结强度。与没有钢纤维的样品相比,钢纤维增强可以提高极限粘结强度,粘结刚度和残余强度。同时,也将减少覆盖厚度,箍筋比对钢纤维试样的影响。最后,提出了极限粘结应力的预测计算和粘结应力-滑移关系的解析模型,与试验结果吻合良好。

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