灌浆不足对钢筋套筒连接力学性能影响试验
Experimental Study on Effect of Mechanical Behavior of Grout Sleeve Splicing for Reinforced Bars Due to Lack of Grout
投稿时间:2018-04-04  修订日期:2019-05-01
DOI:10.11908/j.issn.0253-374x.2019.07.005     稿件编号:    中图分类号:TU375; TU317.1
 
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中文摘要
      基于已有钢筋套筒灌浆连接的研究成果,通过人为控制灌浆料含量,模拟实际工程中灌浆不足的缺陷,进行套筒连接的静力下单向拉伸试验,研究不同灌浆料含量对静力下钢筋套筒灌浆连接的力学性能、变形性能的影响;进行滞回受力下的高应力反复拉压试验和大变形反复拉压试验,研究不同灌浆料含量对钢筋套筒灌浆连接抗震性能的影响.试验考虑灌浆料含量为影响因素,以钢筋上表面灌浆料的覆没厚度为变量反映水平连接的灌浆料含量,以上侧钢筋在灌浆料中的锚固长度为变量反映竖向连接的灌浆料含量.试验结果表明,钢筋套筒灌浆连接的破坏模式包括钢筋拔出和钢筋拉断,主要取决于钢筋与灌浆料间黏结承载力与钢筋抗拉承载力的相对大小,黏结承载力主要受灌浆料含量的影响.
英文摘要
      Based on existing research results on grout sleeve splicing for reinforced bars, insufficient grouting defects in actual projects were simulated by controlling artificially the content of grout. Monotonic tension tests were carried to study the performance of mechanical properties and deformation. High-stress reversed tension and compression test and large-deformation reversed tension and compression test were carried to study the mechanical performance under minor and major earthquakes respectively. The content of grout was the only influencing factor in the test. The thickness of grout above the bar reflected the level of the grout content in horizontal connection, the upper steel’s anchorage length reflected grout content in vertical connection. The test results show that two categories of failure pattern might happen, pullout or fracture of the bar, which was decided by the bond capacity, between the bar and the grout, together with the tensil capcity of the bar. The bond capacity is mainly affected by grout content.
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