A fundamental study on structural strength assessment of U-bolts for expanded application to shipbuilding and offshore piping systems

IF 2.3 3区工程技术 Q2 ENGINEERING, MARINE International Journal of Naval Architecture and Ocean Engineering Pub Date : 2024-01-01 DOI:10.1016/j.ijnaoe.2023.100561

Minsung Chun , Jinyoung Kim , Kangho Kim , Daseul Jeong , Deokyeon Lee , Sungkuk Wi , Byeonghwa Kim , Cheonghak Kim , Chun-Sik Shim

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Abstract

The currently defined Safe Working Load (SWL) of the U-bolt has been determined excessively conservatively. To address this issue, this study conducted structural tests and numerical analysis on round type U-bolts of various sizes. The structural tests were conducted using a 2.5 MN actuator at the SURF R&D center, and the strain was measured through a uniaxial strain gage. The test showed the failure load greatly exceeded the design load with horizontal force. This necessitates a reevaluation and redefinition of load standards. Nonlinear numerical analysis was carried out, and these results were compared with the structural test results. When subjected to vertical loading, behavior was similar to uniaxial tension. On the other hand, using linear elastic analysis for determining SWL for horizontal loading was found to be irrational. A methodology was proposed for estimating the SWL of the U-bolt.

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关于 U 型螺栓结构强度评估的基础研究，以扩大其在造船和近海管道系统中的应用

目前对u型螺栓安全工作载荷(SWL)的定义过于保守。针对这一问题，本研究对不同尺寸的圆形u型螺栓进行了结构试验和数值分析。结构试验采用SURF R&D中心的2.5 MN作动器进行，并通过单轴应变片测量应变。试验结果表明，在水平力作用下，破坏荷载大大超过设计荷载。这就需要重新评估和重新定义负荷标准。进行了非线性数值分析，并与结构试验结果进行了比较。当受到垂直加载时，其行为与单轴拉伸相似。另一方面，采用线弹性分析确定水平荷载下的荷载强度是不合理的。提出了一种估算u型螺栓SWL的方法。

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来源期刊

International Journal of Naval Architecture and Ocean Engineering ENGINEERING, MARINE-

CiteScore

4.90

自引率

4.50%

发文量

审稿时长

12 months

期刊介绍： International Journal of Naval Architecture and Ocean Engineering provides a forum for engineers and scientists from a wide range of disciplines to present and discuss various phenomena in the utilization and preservation of ocean environment. Without being limited by the traditional categorization, it is encouraged to present advanced technology development and scientific research, as long as they are aimed for more and better human engagement with ocean environment. Topics include, but not limited to: marine hydrodynamics; structural mechanics; marine propulsion system; design methodology & practice; production technology; system dynamics & control; marine equipment technology; materials science; underwater acoustics; ocean remote sensing; and information technology related to ship and marine systems; ocean energy systems; marine environmental engineering; maritime safety engineering; polar & arctic engineering; coastal & port engineering; subsea engineering; and specialized watercraft engineering.