Nonlinear bend stiffener analysis using a simple formulation and finite element method |
| |
| Authors: | Dong Jin Tong Ying Min Low John M Sheehan |
| |
| Institution: | School of Civil & Environmental Engineering,Nanyang Technological University,Singapore 639798,Singapore c Acergy Singapore Pte Ltd,Singapore 119963,Singapore |
| |
| Abstract: | Flexible marine risers are commonly used in deepwater floating systems. Bend stiffeners are designed to protect flexible risers
against excessive bending at the connection with the hull. The structure is usually analyzed as a cantilever beam subjected
to an inclined point load. As deflections are large and the bend stiffener material exhibits nonlinear stress-strain characteristics,
geometric and material nonlinearities are important considerations. A new approach has been developed to solve this nonlinear
problem. Its main advantage is its simplicity; in fact the present method can be easily implemented on a spreadsheet. Finite
element analysis using ABAQUS is performed to validate the method. Solid elements are used for the bend stiffener and flexible
pipe. To simulate the near inextensibility of flexible risers, a simple and original idea of using truss elements is proposed.
Through a set of validation studies, the present method is found to be in a good agreement with the finite element analysis.
Further, parametric studies are performed by using both methods to identify the key parameters and phenomena that are most
critical in design. The most important finding is that the common practice of neglecting the internal steel sleeve in the
bend stiffener analysis is non-conservative and therefore needs to be reassessed. |
| |
| Keywords: | bend stiffener cantilever beam nonlinear finite element analysis |
| 本文献已被 CNKI SpringerLink 等数据库收录！ |
| 点击此处可从《中国海洋工程》浏览原始摘要信息 |
| 点击此处可从《中国海洋工程》下载免费的PDF全文 |
|
