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Nonlinear Bend Stiffener Analysis Using A Simple Formulation and Finite Element Method

China Ocean Engineering 2011年第4期25卷 577-590页

作者： TONG Dong Jin LOW Ying Min SHEEHAN John M marlrrme research centre Nanyang Technological University Singapore 639798 Singapore School of Civil ＆ Environmental Engineering Nanyang Technological University Singapore 639798 Singapore Acergy Singapore Pte Ltd Singapore 119963 Singapore

Flexible marine risers are commonly used in deepwater floating systems. Bend stiffeners are designed to protect flexible risel 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.

关键词： bend stiffener cantilever beam nonlinear finite element analysis

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