作者：陈云飞1, 成志强1, 李昂2, 喻勇1
作者单位：1. 西南交通大学力学与航空航天学院，四川 成都 610031;
2. 成都管力安科技有限公司，四川 成都 610041
关键词：大直径管道;b型套筒;品字形焊接板;轴向承载力;有限元分析
摘要：
含环焊缝缺陷的管道采用b型套筒修复后的极限轴向承载能力至关重要。若依靠试验获得大直径管道修复后的极限轴向承载力，或代价昂贵，或因加载设备的载荷限制而难以实施，文章提出采用品字形焊接板预测其极限轴向承载力的方法。首先，选取两段φ219 mm的管子对接，模拟环焊缝完全断开的管道。经b型套筒修复后，通过“以压代拉”试验获得极限轴向承载力。同时，进行有限元模拟，试验与模拟结果相差仅2.8%。进而，采用同样的有限元建模方法，获得b型套筒修复φ1016 mm管道后的极限轴向承载力。最后，针对φ1016 mm管道的b型套筒修复结构，分析其轴对称性及品字形焊接板承受拉伸时的边界效应，开展品字形焊接板拉伸试验。结果表明，品字板法预估值与有限元模拟值仅相差3.1%。综合模拟与试验结果，品字形焊接板可以准确预估b型套筒修复含环焊缝缺陷管道后的极限轴向承载力。
prediction method of the ultimate axial bearing capacity of b sleeve
chen yunfei1, cheng zhiqiang1, li ang2, yu yong1
1. school of mechanics and aerospace engineering, southwest jiaotong university, chengdu 610031, china;
2. chengdu guanli’an technology co., ltd., chengdu 610041, china
abstract: the ultimate axial bearing capacity of the pipeline with circumferential weld defects repaired with b-type sleeve is very important. yet it is difficult to obtain the ultimate axial bearing capacity of large-diameter pipes by experiment, either too expensive or load limitation of testing machine, and a method of using the pyramid structure welded by three plates to predict its ultimate axial bearing capacity is proposed. first, dock two φ219 mm pipes to simulate a pipe with a completely cracked circumferential weld. repair the pipes with b sleeve, and obtain its ultimate axial bearing capacity through the “pressure turns to tension” test. simultaneously, carry out the corresponding finite element simulation, and the deviation between experiment and simulation is only 2.8%. furthermore, adopt the same finite element modeling method to obtain the ultimate axial bearing capacity of the φ1016 mm pipe repaired with b sleeve. ultimately, targeting the b sleeve repair structure of the φ1016 mm pipe and considering its axial symmetry and the boundary effect of the pyramid structure welded by three plates when it is stretched, a tensile test of the pyramid structure welded by three plates is carried out. the results show that the difference between the predicted value of the pyramid structure welded by three plates method and the finite element simulation value is only 3.1%. synthesizing the simulation and test results, the prediction method of the pyramid structure welded by three plates can accurately estimate the ultimate axial bearing capacity of the pipeline with circumferential weld defects repaired with b-type sleeve.
keywords: large-diameter pipe;b sleeve;pyramid structure welded by three plates;axial bearing capacity;fem simulation
2023, 49(4):40-44 收稿日期: 2021-08-06;收到修改稿日期: 2021-10-11
基金项目: 山西省交通科学研究院集团创新发展项目（20-jkcf-48）
作者简介: 陈云飞(1996-),男,河北邯郸市人,硕士研究生,专业方向为结构安全评估及修复
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