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[1]王盘虎,陆展,白涌滔,等.足尺天然气管道多钢级变幅循环弯曲疲劳特性研究[J].中国安全生产科学技术,2026,22(2):63-71.[doi:10.11731/j.issn.1673-193x.2026.02.008]
　WANG Panhu,LU Zhan,BAI Yongtao,et al.Research on variable amplitude cyclic bending fatigue characteristics of multi-grade full-scale natural gas pipelines[J].Journal of Safety Science and Technology,2026,22(2):63-71.[doi:10.11731/j.issn.1673-193x.2026.02.008]
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足尺天然气管道多钢级变幅循环弯曲疲劳特性研究()

《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
22
期数:
2026年2期
页码:
63-71
栏目:
安全工程技术
出版日期:
2026-02-28

文章信息/Info

Title:
Research on variable amplitude cyclic bending fatigue characteristics of multi-grade full-scale natural gas pipelines
文章编号:
1673-193X(2026)-02-0063-09
作者:
王盘虎; 陆展; 白涌滔; 宋晓健
（1.西南油气田川东北作业分公司，四川 成都 610000；
2.重庆大学 土木工程学院，重庆 400044)
Author(s):
WANG Panhu;  LU Zhan;  BAI Yongtao;  SONG Xiaojian
（1.Southwest Oil and Gas Field CDB Operating Company,Chengdu Sichuan 610000,China;
2.School of Civil Engineering,Chongqing University,Chongqing 400044,China）
关键词:
天然气管道; 循环弯曲; 足尺试验; 损伤演化; 安全评估
Keywords:
natural gas pipeline;  cyclic bending;  full-scale testing;  damage evolution;  safety assessment
分类号:
X937
DOI:
10.11731/j.issn.1673-193x.2026.02.008
文献标志码:
A
摘要:
为了探究在役天然气管道超低周循环弯曲疲劳特性，开展L245NS与L360QS共2种典型钢级管道足尺四点循环弯曲试验，采用常幅与变幅2种加载模式模拟外部扰动低频大幅值循环荷载，结合位移与应变监测数据，分析不同钢级管道损伤演化机制与失效模式。研究结果表明：L245NS管道表现为“渐进式损伤”，塑性变形从加载初期持续稳定累积，失效过程可预测但安全裕度小；L360QS管道呈现典型“稳定-突变式损伤”，经历长期弹性安定阶段后，损伤超过临界点急剧失稳，失效过程具突发性；仅依靠常幅加载评估高强钢性能存在局限性；基于真实试验数据揭示多阶段损伤特征，建立从“结果控制”转向“过程管理”3级动态安全阈值体系。研究结果可为交汇工程管道材料选型、安全评估与健康监测提供参考。
Abstract:
In order to investigate the ultra-low-cycle cyclic bending fatigue behavior of in-service natural gas pipelines,full-scale four-point cyclic bending tests are conducted on two representative pipeline steel grades,L245NS and L360QS.Two loading protocols,constant-amplitude and variable-amplitude,are used to emulate low-frequency,large-amplitude cyclic loads induced by external disturbances.Based on displacement and strain monitoring data,this study analyzes the damage evolution mechanisms and failure modes of pipelines with different steel grades.The results show that the L245NS pipeline exhibits progressive damage,where plastic deformation accumulates continuously and steadily from the early loading stage,leading to a predictable failure process but a limited safety margin.In contrast,the L360QS pipeline shows a stable-to-abrupt damage pattern.It remains in a long-lasting elastic shakedown stage,but once damage exceeds a critical threshold,rapid instability occurs,resulting in a sudden failure process.The results also indicate that evaluating the performance of high-strength steel using only constant-amplitude loading has clear limitations.Based on the full-scale experimental evidence of multi-stage damage behavior,a three-level dynamic safety threshold system is established to support a shift from outcome-based control to process-oriented management.These findings provide a reference for material selection,safety assessment,and health monitoring of pipelines in crossing projects.

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备注/Memo

备注/Memo:
收稿日期： 2025-10-14
作者简介： 王盘虎，本科，高级工程师，主要研究方向为天然气管道安全。
通信作者： 白涌滔，博士，教授，主要研究方向为钢结构疲劳损伤。
更新日期/Last Update: 2026-03-09