| The development of port logistics and regional economy has a synergistic effect.With the growth of global economic integration,the volume of container shipping has increased year by year,so it promotes the levels of container ships and coastal ports.In order to meet the requirement of port logistics operations,the structure of quayside container cranes had been changed in many ways,such as efficiency,large-scale,and complexity.The strong winds and variable weather could lead to the windstorm accident of large equipment at port terminals.Therefore,study on the wind load characteristics of quayside container cranes is of vital importance for ensuring structure anti-wind safety,preventing the windstorm accident on the port and promoting sustainable development of maritime transport.In this paper,the wind load characteristics of cranes are analyzed by wind tunnel test,and the statistics data for the quayside carne wind load were obtained.At the same time,the fitting formula of the wind force coefficient with respect to yaw angles were summarized,providing reference for the wind-resistant design of quayside container cranes.The main contents are as follows:(1)The spires and roughness elements passive simulation technology was used to simulate the atmospheric boundary layer in wind tunnel experiments according to the structural characteristics and practical working conditions of the port crane,and the profiles of wind speed and turbulence intensity for the terrain category A has been successfully simulated.The turbulence power spectrum fits in Karman spectrum,in which the quayside container crane model of 1/150 linear scale has been made by aluminum alloys.In addition,the model could satisfy the experimental requirements of similarity principle and blockage ratio.(2)The mean wind load effect on the structure was investigated.With the wind tunnel test,we analyzed different conditions graphs using date of the mean wind force coefficient with variation of 0～180° wind angle,which show the most unfavorable direction don’t appear in the directions of the principal axes.The mean wind load coefficient of working state was large than that of non-working state,and the coefficient in uniform wind field was large than that of terrain category A.(3)The RMS wind load effect on the structure was simulated.The graphs in different conditions were drawn and analyzed using date of the fluctuating wind force coefficient with variation of 0～180° wind angle.Results show the maximum RMS wind load also appears in inclined wind angle.The fluctuating wind load coefficient in terrain category A is larger than that of uniform flow.The crane states play a small role in uniform flow.And the fluctuating wind load coefficient of non-working state is large than that of working state in terrain category A.(4)The experience formula of wind load coefficient and wind angle is established by using curve fitting theory and Origin software,and a new method to calculate different cranes wind load coefficient is proposed.Results show that the fitting formulas were summarized successfully,which can be provided as the reference for the wind-resistant design of quayside container cranes. |
