灌浆不足对钢筋套筒连接力学性能影响试验
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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.
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.
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.
引文
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[15] ONG H Y.Experimental study of grout filled splice sleeve integrated with shear key for precast concrete connection[D].Johore Johor Bahru:Universiti Teknologi Malaysia,2010.
[2] 中华人民共和国行业标准.钢筋套筒灌浆连接应用技术规程:JGJ355-2015 [S].北京:中国建筑工业出版社,2015.Profession Standard of the People’s Republic of China.Technical specification for grout sleeve splicing of rebars:JGJ355-2015 [S].Beijing:China Architecture & Building Press,2015.
[3] 栗新.工业化预制装配式(PC)住宅建筑的设计研究与应用[J].建筑施工,2008,30(3):201.LI Xin.Study on design and application of industrialized PC dwellings[J].Architectural Engineering,2008,30 (3):201.
[4] 中华人民共和国建筑工业行业标准.钢筋连接用套筒灌浆料:JG/T408-2013 [S].北京:中国标准出版社,2013.Profession Construction Industry Standard of the People’s Republic of China.Couples for rebar mechanical splicing:JG/T408-2013[S].Beijing:Standards Press of China,2013.
[5] KIM Y.A study of pipe splice sleeves for use in precast beam-column connections[D].University of Texas at Austin,2000.
[6] HENIN E,MORCOUS G.Non-proprietary bar splice sleeve for precast concrete construction[J].Engineering Structures,2015,83:154.
[7] 郑永峰,郭正兴,孙志成.新型变形灌浆套筒连接接头性能试验研究[J].施工技术,2014,43(22):40.ZHENG Yongfeng,GUO Zhengxing,SUN Zhicheng.Experimental study on the behavior of grouted deformed pipe splice[J].Construction Technology,2014,43(22):40.
[8] 郑永峰,郭正兴,曹江.新型灌浆套筒的约束机理及约束应力分布[J].哈尔滨工业大学学报,2015,47(12):106.ZHENG Yongfeng,GUO Zhengxing,CAO Jiang.Confinement mechanism and confining stress distribution of new grouting coupler for rebars splicing[J].Journal of Harbin Institute of Technology,2015,47(12):106.
[9] 郑永峰.变形灌浆套筒连接性能试验研究及有限元分析[J].建筑结构学报,2016,37(3):94.ZHENG Yongfeng.Experimental study and finite element analysis on behavior of deformed gout-filled pipe splice[J].Journal of Building Structures,2016,37(3):94.
[10] 中华人民共和国国家标准.球墨铸铁件:GB/T1348-2009 [S].北京:中国标准出版社,2009.National Standards of the People’s Republic of China.Spheroidal graphite iron castings:GB/T1348-2009[S].Beijing:Standards Press of China,2009.
[11] 中华人民共和国行业标准.钢筋机械连接通用技术规程:JGJ107-2010[S].北京:中国建筑工业出版社,2010.Profession Standard of the People’s Republic of China.Technical specification for mechanical splicing of steel reinforcing rebar:JGJ107-2010[S].Beijing:China Architecture & Building Press,2010.
[12] 中国国家标准化管理委员会.金属材料拉伸试验第1部分:室温试验方法:GB/T228.1-2010[S].北京:中国标准出版社,2011.Standardization Administration of the People’s Republic of China.Metallic materials—tensile testing—part 1:method of test at room temperature:GB/T228.1-2010[S].Beijing:Standards Press of China,2011.
[13] LING J H,ABD RAHMAN A B,MIRASA A K,et al.Performance of CS-sleeve under direct tensile load:part 1:failure modes[J].Malaysian Journal of Civil Engineering,2008,20(1):89.
[14] GOH H M.Parametric study of steel grouted splice sleeve with integrated double springs under axial tension[D].Johore Johor Bahru:Universiti Teknologi Malaysia,2009.
[15] ONG H Y.Experimental study of grout filled splice sleeve integrated with shear key for precast concrete connection[D].Johore Johor Bahru:Universiti Teknologi Malaysia,2010.