Crane Runway Loadings for Industrial Facilities-Vertical, Lateral and Longitudinal A Review of International Codes and Standards

摘要

Design criteria for crane runway systems vary widely between the numerous codes and standards that are currently in use. There are significant differences in magnitudes of loads, calculation methods and general design philosophy. The complexity of calculation methods varies greatly between different standards with some using simple factors, and other using more complex rational formulae to account for variations in operating speeds and conditions. In this paper, vertical, lateral and longitudinal impact factors are compared for various North American, European and Asian standards. Vertical impact factors are applied to wheel loads and/or the lifted load to account for an increased vertical load due to crane travel and hoisting respectively. Lateral load factors are applied to the lifted load and/or trolley load to account for trolley travel and skewing of the crane. Longitudinal load factors are applied to wheel loads to account for acceleration and braking of the crane. The aggregate effects of these load factors are also compared for two typical cranes; a 50 ton coil handling crane and a 25 ton rigid mast stacker crane. Longitudinal loads for all codes are fairly similar, but the vertical and lateral loads vary significantly between different standards. These differences arise from both the recommendations for the load factors and the suggested methods for calculating the total loadings.