SIMPLIFIED PIPELINE-SOIL INTERACTION MODEL FOR VIBRATION-BASED DAMAGE DETECTION OF ONSHORE PIPELINES
Pipeline free spanning is often unavoidable due to irregular seafloor topography during installation and/or vibration and scouring during operation. The existence of this damage will cause fatigue damage due to oscillatory loads induced by vortex shedding. The vibration-based method is a global method which does not require prior knowledge of damage locations. It can be applied to detect pipeline damage. The successful application of this method needs experimental modal testing as well as numerical simulations. The boundary conditions of a pipeline are extremely complex with consideration of pipelinesoil interaction. The stiffness of soil supports varies in spaces,which will largely affect the dynamic properties of a pipe. Further,the existence of soil will increase the damping ratio of a pipe. This paper reports damage detection results of an onshore pipeline model. In the study,a simplified pipeline-soil interaction model is built in ANSYS. It simulates soil support as distributed springs. A model updating method using Clonal Selection Algorithm is adopted to update the numerical model to match the modal testing results for pipeline condition detection. A scaled pipeline model is tested in the laboratory. The experimental results are used in the study to verify the model reliability. Numerical simulations and experimental results demonstrate the effectiveness of this method.
Free span Vibration-based method Pipeline-soil interaction Simplified model Model updating
Ying Wang Hong Hao Xue-Lin Peng
School of Civil and Resource Engineering,the University of Western Australia,Crawley,WA 6009,Australia
国际会议
The Eleventh International Symposium on Structural Engineering(第十一届结构工程国际研讨会)
广州
英文
1375-1380
2010-12-01（万方平台首次上网日期，不代表论文的发表时间）