多工况下地下管道结构疲劳可靠度分析
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摘要
疲劳破坏是埋地管道主要的失效方式之一,超载、地下空洞等因素都会加剧地下管道结构的疲劳损伤,对其安全运行构成威胁。对管道服役期在各种不利影响因素组合下的动力响应特征进行数值模拟分析,确定其疲劳应力谱;基于材料S-N曲线和Miner线性累积损伤准则,利用可靠性理论建立了交通荷载作用下地下管道结构疲劳的极限状态方程,计算了管道结构的疲劳寿命和疲劳可靠度指标;以某软土路基环境下地下燃气管道为例,定量评估了超载和地下空洞对地下管道结构疲劳可靠度的影响。将管道在荷载作用下的结构动力分析与疲劳可靠度相结合,为地下管道结构疲劳可靠度评估提供了一种新的分析方法,可为城市地下管道的设计、施工、维护及检修提供科学依据。
Fatigue damage is one of the major failure modes of underground pipelines.Unfavorable working conditions such as overloading,underground cavity,etc.will increase fatigue damage of underground pipeline structure and pose a threat to their safe operation.This paper numerically simulates the dynamic response of the pipeline during the service period under various adverse factors,and determines its fatigue stress spectrum.Based on S-N fatigue curve of the material and Miner linear cumulative fatigue damage theory,the paper uses the reliability theory to establish the fatigue limit state equation of underground pipeline structure under traffic load,and calculates the fatigue life and fatigue reliability index of pipeline structure.Taking the underground gas pipeline under a soft soil roadbed environment as an example,the paper quantitatively evaluates the impact of overload and underground cavities on the fatigue reliability of underground pipeline structure.The paper combines the structural dynamic analysis and fatigue reliability of pipelines under load,provides a new method for fatigue reliability evaluation of underground pipeline structure,and provides a scientific basis for the design,construction,and maintenance of urban underground pipelines.
Fatigue damage is one of the major failure modes of underground pipelines.Unfavorable working conditions such as overloading,underground cavity,etc.will increase fatigue damage of underground pipeline structure and pose a threat to their safe operation.This paper numerically simulates the dynamic response of the pipeline during the service period under various adverse factors,and determines its fatigue stress spectrum.Based on S-N fatigue curve of the material and Miner linear cumulative fatigue damage theory,the paper uses the reliability theory to establish the fatigue limit state equation of underground pipeline structure under traffic load,and calculates the fatigue life and fatigue reliability index of pipeline structure.Taking the underground gas pipeline under a soft soil roadbed environment as an example,the paper quantitatively evaluates the impact of overload and underground cavities on the fatigue reliability of underground pipeline structure.The paper combines the structural dynamic analysis and fatigue reliability of pipelines under load,provides a new method for fatigue reliability evaluation of underground pipeline structure,and provides a scientific basis for the design,construction,and maintenance of urban underground pipelines.
引文
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[14]Chung H Y.Fatigue Reliability and Optimal Inspection Strategies for Steel Bridges[D].Austin:The University of Texas at Austin,2004.
[15]Wirsching P H,Chen Y N.Consideration of probability-based fatigue design for marine structures[J].Marine Structural Reliability Engineering Symposium,1990,1:23-45.
[2]董冬冬,王非,张亚军,等.交通荷载作用下HDPE管道附加弯矩变化规律研究[J].地下空间与工程学报,2016,12(s1):80-88.
[3]Committee on Fatigue and Fracture Reliability of the Committee on Structural Safety and Reliability of the Structural Division,ASCE.Fatigue reliability:Introduction[J].Journal of the Structural Division,1982,108(1):3-23.
[4]黄小光,韩忠英.海底管道疲劳损伤与疲劳寿命的可靠性计算[J].油气储运,2010,29(11):827-831.
[5]鲁乃唯,罗媛,汪勤用,等.车载下大跨度桥梁动力可靠度评估[J].浙江大学学报,2016,50(12):2328-2335.
[6]蒋文涛,薛彩军.飞机起落架结构模糊疲劳可靠性分析[J].飞机设计,2011,31(1):17-20.
[7]Miner M A.Cumulative damage in fatigue[J].Journal of Applied Mechanics,1945,12(3):159-164
[8]中华人民共和国建设部.钢结构设计规:GB 50017-2003[S].北京:中国计划出版社,2003.
[9]American Welding Society(AWS),Committee on Structural Welding.Structural Welding Code-steel:AWS D1.1/D1.1 M:2015[S].[S.l]:American National Standards Institute,1983.
[10]American Bureau of Shipping.Guide for the Fatigue Assessment of Offshore Structures:ABS-115 CORR[S].TX,USA:ABS,2003.
[11]张晋元.荷载与结构设计方法[M].天津:天津大学出版社,2015.
[12]杨桂玲,刘凯,汪明,等.多因素影响下埋地管道安全性能的数值模拟[J].安全与环境工程,2017,24(3):155-159.
[13]中华人民共和国交通部.公路桥涵设计通用规范:JTG D60-2015[S].北京:人民交通出版社,2015.
[14]Chung H Y.Fatigue Reliability and Optimal Inspection Strategies for Steel Bridges[D].Austin:The University of Texas at Austin,2004.
[15]Wirsching P H,Chen Y N.Consideration of probability-based fatigue design for marine structures[J].Marine Structural Reliability Engineering Symposium,1990,1:23-45.