摘要
针对工程实际中海底悬跨管道两端边界处多为非对称约束的现状,本文做了相应的涡激振动疲劳损伤分析。运用土体弹簧描述悬跨管道两端跨肩处的管-土作用,通过改变土体弹簧刚度模拟边界条件变化。利用理论模型模拟结构的振动响应,结合S-N曲线法,分析了非对称边界条件下海底悬跨管道疲劳特性。研究结果表明:悬跨两端的土体扭转刚度存在一个临界区域(扭转刚度为10~6～10~8)。当扭转刚度在此临界区域内变化时,海底悬跨管道的疲劳特性会发生剧烈变化;在此区域外,端部扭转弹簧刚度对结构疲劳影响较小。
Herein, the vortex-induced vibration fatigue damage analysis is conducted considering the fact that, in engineering practice, the boundary at both ends of the submarine suspension pipeline is always asymmetrical. In this paper, the pipe-soil coupling effect at the shoulders of the submarine pipeline span was considered using two groups of soil springs. The boundary condition change was simulated by altering the stiffnesses of the soil springs. Using the theoretical model to simulate the vibration response of the structure and by combining the S-N curve method, the fatigue characteristics of free-span submarine pipelines under the asymmetric boundary condition was discussed in detail. Results show that there exists a critical region (10^6~10^8) for the torsional stiffness of soil at both ends of the suspended span. When the torsional stiffness in this area changes, the fatigue characteristics of the submarine suspending pipeline also change dramatically, whereas the end torsional spring stiffness has little effect on the fatigue of the structure outside the region.
作者
高喜峰
廖宏运
徐万海
GAO Xifeng;LIAO Hongyun;XU Wanhai(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2019年第5期960-966,共7页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(51479135
51679167)
国家自然科学基金创新研究群体科学基金项目(51621092)
关键词
非对称边界
涡激振动
土体弹簧
管-土相互作用
悬跨
海底管道
S-N曲线法
疲劳损伤
asymmetric boundary conditions
vortex-induced vibration
soil spring
pipe-soil coupling effect
spanning
submarine pipeline
S-N curve method
fatigue damage
