ASSESSMENT TO ICEBERG IMPACT LOADS TO FIXED STRUCTURES IN MULTI PLANAR SPACE

This paper investigates the iceberg impact force to fixed structures in multi-planar space (3D). The global and local impact mechanics are discussed in details. The global impact energy is calculated by considering the eccentricities of iceberg in multi-planar space considering the tangential impact momentum. Thus, the impact phenomenon in a detailed manner could be assessed, such as the influences of friction and structural inclination to impact loads et.al.. It is found that the dissipated energy during an impact does not depend on the local stiffness within the contact area. Meanwhile, the impact force and duration are linked to the local stiffness. A semi-integrated analysis has been demonstrated to approach the local deformations of structure and iceberg. The structure and ice deformation could be simplified as linear/nonlinear springs. The ice pressure-area relationship and the force-deformation curve are used respectively to approach the local deformation. The methodology proposed here shows excellent agreement with previous work in planar case (2D). Sensitivity studies have been performed both to global and local mechanics. Conclusions and summaries have been included.