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EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF SLEEVE SPLICING GROUTED WITH PVA FIBER-REINFORCED CEMENTITIOUS COMPOSITES
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摘要: 通过对6个中心拉拔试件和27个灌浆套筒接头试件的单向拉伸试验，分析聚乙烯醇（PVA）纤维、钢筋锚固长度以及有无约束对灌浆套筒接头受力性能的影响。结果表明：PVA纤维能够提高无约束状态钢筋与灌浆料的黏结强度，对套筒约束状态接头连接性能影响不明显。增加钢筋锚固长度，接头连接刚度越大，荷载滑移曲线发展越平稳。当灌浆料强度达到85~90 MPa时，锚固长度为6倍钢筋直径即可满足接头强度要求。套筒约束能够提高套筒与灌浆料和钢筋之间的黏结强度。Abstract: According to test results of pull-out tests for 6 specimens and uniaxial tensile tests for 27 grouted sleeve-splicing specimens,the influences of PVA fiber, anchorage length of rebars and with or without confines of grouted sleeves on splicing were analyzed. The results showed that the addition of PVA fiber could improve the bonding strength between the unconfined rebars and grouting materials, but had not obvious impact on the properties of grouted sleeve splicing. The rigidity of grouted sleeve splicing increased with the increase of anchorage length and the load-displacement curves was also more smoother. When the strength of the grouting materials was up to 85 to 90 MPa, the anchorage length of six times diameter of rebars could well meet the strength requirement of the grouted sleeve splicing. The constraint of sleeves could improve the bonding strength of the sleeves, grouting materials and rebars.
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