Strength Analysis of Crane Hook Structure with Trapezoidal Cross-Section Based on Rigging Configuration on the Upper Deck Lifting Process

Abstract

Lifting is one of the most important processes in offshore platform fabricaction. This process involves structures with large loads and dimensions which can lead to structural failure. One of the failures that often occur in lifting operations is the failure of the crane hook structure. In this study, strength analysis of the rigging configuration and crane hook is carried out in the upper deck lifting process at the stacking phase using analytical and numerical methods. The hook crane model used is Ramshorn Forged Hooks with a design based on DIN15402. Furthermore, local stress analysis is carried out on the crane hook structure to determine the deformation, maximum Von Mises stress, and Von Mises stress in cross-section that occurs in the crane hook structure with a trapezoidal cross-section. Simulations are carried out using analytical and finite element method software. The results of the stress analysis on the trapezoidal cross-section will then be validated. Then the calculation of the safety factor (SF) based on the results of the analysis of the maximum Von Mises stress is carried out to determine the failure of the crane hook structure when given a predetermined load.