| 引用本文: | 余琼,孙佳秋,袁炜航.带肋钢筋与套筒约束灌浆料黏结性能试验[J].哈尔滨工业大学学报,2018,50(12):98.DOI:10.11918/j.issn.0367-6234.201711108 |
| YU Qiong,SUN Jiaqiu,YUAN Weihang.Experimental study on bond behavior between ribbed steel bars and sleeve constrained grouting material[J].Journal of Harbin Institute of Technology,2018,50(12):98.DOI:10.11918/j.issn.0367-6234.201711108 |
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| 摘要: |
| 为套筒约束灌浆料在预制装配式结构中应用提供理论依据,进行了45个带肋钢筋锚入套筒约束灌浆料中的拉拔试验,研究了试件破坏形态和黏结强度的变化规律,拟合钢筋与套筒约束灌浆料间黏结滑移本构关系,并给出本构关系中各特征点的黏结强度和滑移值计算公式,计算了钢筋在套筒约束灌浆料中达屈服强度和极限强度的临界锚固长度.试验结果表明:随着钢筋直径增大,试件极限承载力增大,黏结强度总体呈增大趋势；随着锚固长度增大,试件极限承载力增大,但黏结强度降低；当套筒含钢率为13.78%～18.51%时,含钢率的增加对钢筋与灌浆料的黏结强度提高作用较小；由于灌浆料不含粗骨料,使钢筋在灌浆料中达黏结强度对应的滑移值大于钢筋在各种混凝土中达黏结强度对应的滑移值.试件黏结滑移曲线能量分析表明:钢筋直径、锚固长度增大,试件脆性系数总体呈降低趋势,表明试件延性提高；由于套筒的约束,灌浆料与钢筋的锚固长度大大减小. |
| 关键词: 套筒约束 黏结与滑移 本构关系 临界锚固长度 能量分析 |
| DOI：10.11918/j.issn.0367-6234.201711108 |
| 分类号:TU375 |
| 文献标识码:A |
| 基金项目: |
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| Experimental study on bond behavior between ribbed steel bars and sleeve constrained grouting material |
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YU Qiong,SUN Jiaqiu,YUAN Weihang
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(Research Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092, China)
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| Abstract: |
| To study the bond behavior between the ribbed steel bars and sleeve constrained grouting material, pull-out tests were conducted on 45 specimens. The failure modes, ultimate bearing capacity and ultimate average bond strength were studied. The influences of bar diameter, anchorage length and sleeve dimension on the ultimate average bond strength were discussed. Bond-slip constitutive relations between the ribbed steel bars and grout constrained by sleeve were fitted. Equations were proposed for calculating the characteristic bond strengths and their corresponding slip value. Critical anchorage lengths, at which length bar broke or yielded and bar-grout slippage occurred at the same time, were calculated. The test results showed that with the increase of the bar diameter, the ultimate bearing capacity increased, and the ultimate average bond strength increased as a whole. With the increase of anchorage length, the ultimate bearing capacity increased, but the ultimate average bond strength decreased. In the range from 13.78% to 18.51%, the increase of steel content had little positive effect on the average bond strength. Because no coarse aggregate is contained in the grout, the slip value corresponding to the ultimate average bonding strength when the steel bar was anchored in grout was greater than that when the steel bar was anchored in concrete. Based on the energy analysis of the bond slip curve, it concluded that as the diameter and anchorage length of the bar increased, the brittleness coefficient of the specimen decreased generally, indicating the increase of the specimen’s ductility. Due to the confinement of the sleeve, the critical anchorage length decreased greatly. |
| Key words: sleeve constraint bond and slip constitutive relation critical anchorage length energy analysis |
