The Influence of Platform-Conductor Gaps on the Dynamic Response of Offshore Platforms

摘要

The prerequisite to a dynamic analysis of an ocean platform is an accurate baseline measurement of the fundamental flexular and torsional natural frequencies. As an element of this baseline, the author uses the Runga-Kutta numerical integration method to determine the influence of a non-linear structural element on the measurement of the fundamental flexural natural frequency of the system. The non-linear phenomena which was investigated was the collision between the vertical conductor pipes and their guide collars on the platform. The analysis proved that for large excitation loads the response is non-linear, but that there is an excitation level below which the non-linearity is negligible. (Author)