装配式新型灌浆套筒接头设计及有限元分析

Design and Finite Element Analysis of Assembled Grouted Deformed Pipe Splice

新型变形灌浆套筒是由无缝钢管通过冷压轧制而成.通过有限元软件ABAQUS以2D轴对称壳单元建模方式对灌浆套筒连接接头单向拉伸试验进行验证,与试验结果基本吻合.以该建模方式对设计了10个不同参数的套筒接头进行有限元分析.结果表明,直径22 mm钢筋的锚固长度为7.2~8.0倍钢筋直径的套筒接头满足规范《JGJ 107-2010》中I级接头;灌浆料厚度对接头承载力有影响.灌浆料厚度越大,套筒对灌浆料约束越小,灌浆料对钢筋约束越小,接头承载力降低;套筒的变形段长度不宜高于套筒总长度的36%;套筒厚度要求可低至4 mm;套筒接头在受拉力作用下,套筒构造肋的受力从端部向中部增加,在受压力作用下则相反,构造肋总体在拉力作用下较压力作用下受力大.

The grouted deformed pipe splice is made of seamless steel pipe by cold rolling.In this paper,the finite element software ABAQUS was used to verify the uniaxial tensile test of grouting sleeve joint by 2D axisymmetric shell element modeling,and the results were basically consistent with the test results.In this way,the finite element analysis of the sleeve joint with 10 different parameters was carried out.The results show that the anchorage length of 22mm diameter steel bar was 7.2-8.0 times of the diameter of steel bar,and the sleeve joint meets the requirements of grade I joint in JGJ107-2010.The thickness of grouting material was influenced by the bearing capacity of joint.The greater the thickness of grouting material,the smaller the constraint of sleeve to grouting material.The smaller the constraint of grouting material on steel bar,the lower the bearing capacity of joint.The deformation length of the sleeve should not be higher than 36%of the total length of the sleeve.The thickness of sleeve can be as low as 4mm.Under tension,the stress of the sleeve structure rib increases from the end to the middle,while under pressure,the stress of the structure rib is larger under tension than under pressure.