| 组合方形灌浆套筒连接性能试验 |
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| 引用本文： | 戴绍斌,,郑小林,黄 俊,,李玉博,刘 轩.组合方形灌浆套筒连接性能试验[J].建筑科学与工程学报,2020,0(2):54-61. |
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| 作者姓名： | 戴绍斌 郑小林 黄 俊 李玉博 刘 轩 |
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| 作者单位： | (1. 武汉理工大学 土木工程与建筑学院,湖北 武汉 430070; 2. 武汉理工大设计研究院有限公司,湖北 武汉 430070) |
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| 摘 要： | 针对套筒加工工艺、材料、成本等问题,提出了一种由标准无缝方形钢管与带肋钢筋以及螺旋箍筋通过组合拼装而成的新型组合方形灌浆套筒。利用该组合方形套筒,制作了9个7.5倍～12.5倍直径锚固长度的接头试件,通过轴拉试验对接头拉伸性能和工作机理进行研究。结果表明:所有试件均在接头外钢筋某处断裂,接头抗拉强度与连接钢筋抗拉强度标准值的比值均大于1.10,满足规程JGJ 107—2010中对Ⅰ级接头单向拉伸强度要求,当试件的锚固长度达7.5d(d为连接钢筋直径)即可满足条件; 套筒内腔中四角嵌入的焊接钢筋以及螺旋箍筋对套筒的约束机理和应变分布有重要的影响,嵌入的焊接钢筋能承担接头传过来的部分拉力,从而降低方形钢管表面的应力,同时焊接钢筋表面的横肋能有效增加套筒内壁与灌浆料之间的黏结力; 箍筋能进一步约束灌浆料从而提高接头的整体性; 套筒表面应变基本均匀分布,不会出现因套筒截面加工变形导致应变反转等现象。
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| 关 键 词： | 方形钢管 螺旋箍筋 组合套筒 锚固长度 黏结强度 |
Experiment on Behavior of Composite Square Grout-filled Pipe Splice |
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| DAI Shao-bin,,ZHENG Xiao-lin,HUANG Jun,,LI Yu-bo,LIU Xuan.Experiment on Behavior of Composite Square Grout-filled Pipe Splice[J].Journal of Architecture and Civil Engineering,2020,0(2):54-61. |
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| Authors: | DAI Shao-bin ZHENG Xiao-lin HUANG Jun LI Yu-bo LIU Xuan |
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| Affiliation: | (1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Hubei, China; 2. Design & Research Institute Co., Ltd of Wuhan University of Technology, Wuhan 430070, Hubei, China) |
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| Abstract: | Considering the problems of sleeve processing technology, materials, cost and etc., a new type of combined square grouting sleeve was proposed. The sleeve was assembled by standard seamless square steel pipe, ribbed steel bar and spiral stirrup. Using the combined square sleeve, nine joint specimens with a diameter of 7.5 times to 12.5 times the anchor length were fabricated, and the tensile properties and working mechanism of the joint were studied by the axial incremental tension test. The results show that all the test pieces are broken off somewhere outside the joint, and the ratio of the tensile strength of the joint to the standard value of the tensile strength of the steel bar is greater than 1.10, which satisfies the requirements for the tensile strength of the joint of Ⅰ grade in JGJ 107—2010. The condition can be satisfied when the anchor length of the piece reaches 7.5d(d is diameter of connecting steel bar). The welded steel bars embedded in the four corners of the sleeve cavity and the spiral stirrups have an important influence on the confinement mechanism and strain distribution of the sleeve. The embedded welded steel bars can bear part of the tensile force transmitted from the joint, thereby reducing the stress on the surface of the square steel pipe. The transverse rib on the surface of the welded steel bar can effectively increase the bonding force between the inner wall of the sleeve and the grouting material; the hoop can further restrain the grouting material to improve the integrity of the joint; the surface strain of the sleeve is evenly distributed, and the strain inversion caused by deformation of the section processing does not appear. |
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| Keywords: | square steel pipe spiral stirrup composite sleeve embedded length bond strength |
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