锚具-螺栓钢筋连接试验研究与设计方法
引用文献：
殷晓三 许慧慧 邵景干. 锚具-螺栓钢筋连接试验研究与设计方法[J]. 建筑结构，2022，48（08）：140-145.
YIN Xiaosan XU Huihui SHAO Jinggan. Experimental study and design method for anchorage-bolt splicing of steel bars[J]. Building Structure，2022,48（08）：140-145.
摘要：为了提高检测设备安装的效率，分析了基桩承载力检测中钢筋连接的特点，提出了锚具-螺栓钢筋连接方法，并将其与焊接连接方法进行了技术经济比较。对5个锚具-螺栓钢筋连接件进行了拉伸试验研究，主要考察了锚具、螺栓和挡板三者之间的约束关系对连接件承载力的影响。结果表明：与焊接连接方法相比，锚具-螺栓钢筋连接方法具有安装便捷、成本低廉和可循环使用等优势，在基桩承载力检测中，具有替代焊接连接方法的潜力；锚具-螺栓钢筋连接件主要破坏类型为螺栓拉断和钢筋拉断，螺栓孔距锚具越近，钢筋连接效果越好；当挡板与锚具、螺栓采用刚性连接时，螺栓抗拉强度得到充分利用；屈服位移在20～30mm之间，满足基桩承载力检测对钢筋连接的要求；屈服荷载可以作为锚具-螺栓钢筋连接件承载力设计值的指标。最后根据锚具-螺栓钢筋连接件破坏特征建立了其设计方法。
关键词：基桩承载力检测，钢筋连接，焊接连接，锚具-螺栓连接
基金：河南省高等学校重点科研项目(20A560025、22A560007)；河南省交通运输厅科技计划项目(2020J-2-20)；教育部产学合作协同育人项目(201901273059)。
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参考文献[1] 混凝土结构设计规范：GB 50010—2010[S]．北京：中国建筑工业出版社，2011.
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[4] HABER ZACHARY B, SAIIDI M SAIID, SANDERS DAVID H. Behavior and simplified modeling of mechanical reinforcing bar splices[J]. ACI Structural Journal,2015,112(2):179-187.
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[6] 肖顺，李向民，许清风．装配整体式混凝土结构套筒灌浆质量检测与缺陷整治的研究进展[J]．建筑结构，2021,51(5):104-116.
[7] 顾浩声，吴佳鹏．环境温度对钢筋套筒灌浆连接接头性能的影响[J]．结构工程师，2017,33(5):140-146,207.
[8] WU XIAOBAO, LIN FENG, WANG TAO. Experimental research on effects of grout age and types of steel bars on mechanical behavior of grout sleeve splicing for reinforcing bars[J]. Building Structure,2013,43(14):77-82.
[9] 吴文飞．钢筋焊接的质量问题和对验收标准的修改建议[J]．建筑技术，2001,32(11):758-763.
[10] APOSTOLOPOULOS CH ALK, MICHALOPOULOS D,DIMITROV L. The Impact of corrosion on the mechanical behavior of welded splices of reinforcing steel S400 and B500c[J]. Journal of Materials Engineering&Performance,2008,17(1):70-79.
[11] ISSA CAMILLE A, NASR ANTOINE. An experimental study of welded splices of reinforcing bars[J]. Building and Environment,2006,41(10):1394-1405.
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[14] FAN ZHONG, LIU XIANMING, FAN XUEWEI, et al.Design and research of large-span steel structure for the National Stadium[J]. Journal of Building Structures,2007,28(2):1-16.
[2] 徐瑞榕，刘永颐．JGJ 107—2016《钢筋机械连接技术规程》主要修订内容[J]．施工技术，2017,46(9):126-130.
[3] 李佳，张勤，贡金鑫，等．钢筋连接区锈蚀后的抗拉性能及破坏形态试验研究[J]．建筑结构，2020,55(22):83-88.
[4] HABER ZACHARY B, SAIIDI M SAIID, SANDERS DAVID H. Behavior and simplified modeling of mechanical reinforcing bar splices[J]. ACI Structural Journal,2015,112(2):179-187.
[5] 李大宁．我国钢筋连接技术的应用与发展[J]．建筑技术，2018,49(6):581-585.
[6] 肖顺，李向民，许清风．装配整体式混凝土结构套筒灌浆质量检测与缺陷整治的研究进展[J]．建筑结构，2021,51(5):104-116.
[7] 顾浩声，吴佳鹏．环境温度对钢筋套筒灌浆连接接头性能的影响[J]．结构工程师，2017,33(5):140-146,207.
[8] WU XIAOBAO, LIN FENG, WANG TAO. Experimental research on effects of grout age and types of steel bars on mechanical behavior of grout sleeve splicing for reinforcing bars[J]. Building Structure,2013,43(14):77-82.
[9] 吴文飞．钢筋焊接的质量问题和对验收标准的修改建议[J]．建筑技术，2001,32(11):758-763.
[10] APOSTOLOPOULOS CH ALK, MICHALOPOULOS D,DIMITROV L. The Impact of corrosion on the mechanical behavior of welded splices of reinforcing steel S400 and B500c[J]. Journal of Materials Engineering&Performance,2008,17(1):70-79.
[11] ISSA CAMILLE A, NASR ANTOINE. An experimental study of welded splices of reinforcing bars[J]. Building and Environment,2006,41(10):1394-1405.
[12] 孙利伟，丁伯阳，王晓臣．桩静载荷试验数据的拟合分析和荷载传递参数计算[J]．浙江工业大学学报，2008,36(2):209-213.
[13] 张梦．落锤冲击荷载作用下地基承载力检测的数值模拟分析[D]．北京：北京交通大学，2016.
[14] FAN ZHONG, LIU XIANMING, FAN XUEWEI, et al.Design and research of large-span steel structure for the National Stadium[J]. Journal of Building Structures,2007,28(2):1-16.
Experimental study and design method for anchorage-bolt splicing of steel bars
Abstract: In order to improve the installation efficiency of the testing equipment, the characteristics of steel bar splicing in the bearing capacity testing of foundation piles were analyzed, and the anchorage-bolt splicing method of steel bars was put forward, which was compared with welding connection method in technical economy. The tensile test study of 5 anchorage-bolt steel bar connectors was carried out, and the influence of the restraint relation among anchorages, bolts and orifice plate on the bearing capacity of the connectors was mainly investigated. The results show that compared with the welding connection method, the anchorage-bolt splicing method of steel bars has the advantages of convenient installation, low cost and recyclability, so it has the potential to replace the welding connection method in the foundation piles testing. The main failure types of anchorage-bolt connectors are bolt pull cut and steel bar pull cut. The closer the bolt hole is to the anchorage, the better connection effect of the steel bar is. When the orifice plate is rigidly connected with the anchor and the bolt, the tensile strength of the bolt is fully utilized. The yield displacement is between 20 mm and 30 mm, which meets the requirements for the connection of steel bars in the bearing capacity testing of the foundation pile. The yield load can be used as an indicator of the design value of the bearing capacity of the anchorage-bolt steel bar connectors. Finally, the design method is established according to the failure characteristics of the anchorage-bolt steel bar connectors.
Keywords: bearing capacity testing of foundation pile; splicing of steel bar; welded connection; anchorage-bolt splicing
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