Dynamic response analysis of free-span pipelines with strength degradation subjected to underwater explosion

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-09-20 DOI:10.1016/j.tws.2025.114013

Chenyang Wang, Wei Xiao, Xiongliang Yao, Xiaojian Chen, Hui Wang, Kaixiang Yao

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引用次数: 0

Abstract

After the explosion incident of the Nord Stream natural gas pipeline, the safety of free-span pipelines has attracted extensive attention from the international community. However, there are few studies on the problem of pipeline underwater explosion (UNDEX), and the influence of strength degradation caused by vortex-induced vibration (VIV) fatigue damage on the pipeline has been ignored. Based on the strength degradation model and the VIV mechanism, this study proposes a method for solving the residual strength of three-dimensional free-span pipelines. Taking into comprehensive consideration the fatigue-induced strength degradation of pipelines caused by VIV and the intense impact of UNDEX loads, this study systematically investigates the damage evolution process and deformation behavior of free-span pipelines subjected to UNDEX loading through numerical simulation methods. The results show that VIV fatigue damage can degrade the yield strength of the pipeline with 18 years of service from 448 MPa to 378 MPa. Strength degradation aggravates the structural response to UNDEX loads, and the response rate exhibits exponential growth. In addition, the influence of key factors such as the explosive equivalent, detonation location, and the hydrostatic pressure on the pipeline damage effect is discussed, which provides an important theoretical basis for the blast-resistant design and safety assessment of free-span pipelines in complex marine environments.

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水下爆炸作用下强度退化的自由跨管道动力响应分析

“北溪”天然气管道爆炸事故发生后，自由跨管道的安全问题引起了国际社会的广泛关注。然而，对管道水下爆炸问题的研究较少，且忽略了涡激振动（VIV）疲劳损伤引起的强度退化对管道的影响。基于强度退化模型和振动振动机理，提出了一种求解三维自由跨管道残余强度的方法。综合考虑了管道在VIV作用下的疲劳强度退化和UNDEX荷载的强烈影响，通过数值模拟方法系统研究了自由跨管道在UNDEX荷载作用下的损伤演化过程和变形行为。结果表明：在使用18年的管道中，涡激疲劳损伤会使管道的屈服强度从448 MPa降低到378 MPa；强度退化加剧了结构对UNDEX荷载的响应，且响应率呈指数增长。此外，还讨论了炸药当量、爆轰位置、静水压力等关键因素对管道破坏效果的影响，为复杂海洋环境下自由跨管道的防爆设计和安全评价提供了重要的理论依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.