摘要
管道在深水环境中易遭受外压和动力载荷的联合作用,该状态下结构的局部压溃特性还有待与深入探索。建立了管道数值模型,模拟结构屈曲过程并得到临界动力载荷幅值;对影响管道局部屈曲的动力载荷频率、外压大小、管道长度、初始椭圆度缺陷等敏感性因素进行了分析。结果表明,管道截面壳振动使管道承载能力下降是诱发局部压溃的主因,动力载荷对管道的危害大于静力载荷,动力载荷频率接近于截面壳振动频率最易引发局部压溃,管道长度降低可以大大降低动力作用下局部压溃的可能性。
A Pipeline in deep water usually suffers the combined action of both external pressure and dynamic loading. Its local collapse behavior in this state remains to be explored. Here, a pipeline numerical model was established. The pipeline＇s buckling process was simulated and the critical dynamic load amplitude was obtained. In addition,the sensitivity factors affecting the pipeline ＇s local buckling,such as,dynamic load frequency,external pressure value,pipeline length,and initial elliptical defect were analyzed. Results showed that decrease in the loadbearing capacity of the pipeline due to vibration of the pipeline cross-section shell is the main cause to excite its local pressure collapse; the pipeline damage due to dynamic load is larger than that due to static load,the pipeline＇s local collapse happens more easily when the dynamic load frequency is close to the natural frequency of the pipeline＇s crosssection shell; decrease in the pipeline＇s length can reduce greatly the possibility of the pipeline＇s local collapse under dynamic loading.
出处
《振动与冲击》
EI
CSCD
北大核心
2017年第17期104-110,133,共8页
Journal of Vibration and Shock
基金
国家重点基础研究发展计划(973计划)(2014CB046804)
国家自然科学基金(51239008
51379145)
国家工信部高技术船舶科研
关键词
深水管道
管道压溃
动力载荷
数值模拟
deep water pipeline
pipeline collapse
dynamic loading
numerical simulation
