环氧套筒修复管道在轴力作用下的轴向应力计算

1.华北水利水电大学土木与交通学院;2.国家管网集团联合管道有限责任公司西部兰州输气分公司;3.北京科力华安地质灾害监测技术有限公司

环氧套筒;管道修复;应力分析;环焊缝缺陷;轴向承载力

Axial stress calculation of epoxy steel sleeve repaired pipelines under axial forces
ZHANG Xinyang1,WEI Qingdong2,XI Sha3,GUO Xiaodong3,SHI Yanke1,XU Leige1

1.School of Civil Engineering and Transportation, North China University of Water Resources and Electric Power; 2.Lanzhou Gas Transmission Branch, PipeChina West Pipeline Co. Ltd.; 3.Beijing Kelihuaan Geological Disaster Monitoring Technology Co. Ltd.

epoxy steel sleeve, pipeline repair, stress analysis, girth weld defect, axial bearing capacity

DOI: 10.6047/j.issn.1000-8241.2024.03.008

备注

【目的】据调研,钢制环氧套筒修复补强管道在轴力作用下轴向应力解算公式尚不明确。【方法】根据轴力作用下钢制环氧套筒修复管道的受力特点,通过简化,建立力学模型。基于应力解法与变形协调关系,推导提出轴力作用下管道层与套筒层的轴向应力理论求解公式,随后通过ANSYS软件建立有/无法兰套筒修复管道模型,对轴向应力公式进行数值模拟验证,并对直径分别为219mm、660mm、1219mm的管道进行计算,基于数值解对轴向应力理论解对比验证,并在此基础上,通过文献算例试验所测结果对所建立的计算公式进行验证。【结果】经过力学简化所得到的模型具有合理性,所得结果趋于保守;在轴力作用下,有/无法兰套筒修复模型管道层与套筒层内外壁轴向应力理论解与数值解的误差均保持在5%以内;3种不同直径管道的轴向应力理论解与数值解误差不超过5%;在1500kN轴力作用下,轴向应力承载力占比理论值与钢质环氧套筒修复缺陷钢管的全尺寸拉伸试验实测值误差小于5%。【结论】通过理论解与数值解、实测值的对比,验证了轴向应力理论公式的合理性与适用性,依据该公式进行整体结构的校核较为安全,研究结果可为轴力作用下钢制环氧套筒修复补强管道的设计和评价提供参考。(图7表4,参[20]
[Objective] This paper aims to present clarified axial stress solution formulas for epoxy steel sleeve repaired and reinforced pipelines subjected to axial forces. [Methods] A mechanical model was first established to express simplified stress characteristics of pipelines repaired with epoxy steel sleeves under axial forces. Based on this model, theoretical solution formulas were derived for determining axial stresses on the pipe and sleeve layers under axial forces, through utilizing the stress solution method and considering deformation coordination. To verify the proposed axial stress formulas, ANSYS software was employed to establish sleeve repaired pipeline models, both with and without a flange, for numerical simulations. The calculations were performed for pipelines with diameters of 219 mm, 660 mm, and 1 219 mm, respectively. A comparison between the theoretical solutions for axial stress and the numerical solutions was made to verify the proposed formulas. Additionally, the proposed calculation formulas were further verified by comparison with examples found in the available literature. [Results] The study results demonstrated the validity of the mechanically simplified models and their conservative nature in the obtained outcomes. When subject to axial forces, the discrepancies between the theoretical and numerical solutions for axial stress on the inner and outer walls of the pipe layer and sleeve layer, using both the sleeve repair models with and without a flange, remained within 5%. Similarly, in the three diameter scenarios, the differences between the theoretical and numerical solutions for axial stress did not exceed 5%. Furthermore, with an axial force of 1 500 kN, the errors between the theoretical axial stress bearing capacity proportions and the measured values from full-scale tensile experiments on epoxy steel sleeve repaired steel pipelines were all below 5%. [Conclusion] Through the comparison of the theoretical solutions with the numerical solutions and measured values, the rationality and applicability of the theoretical formulas for axial stress have been verified. These formulas can be used for safe integral structural checks. The research findings provide a reference for the design and evaluation of epoxy steel sleeve repaired and reinforced pipelines subjected to axial forces. (7 Figures, 4 Tables, 20 References)
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