Study on Combined Wind-Resistance Characteristics of Double Gantry Crane in Container Yard
The portal cranes are often arranged side by side along the direction of the structure track,and the distance between the two cranes is small,which may provide a chance to reduce the wind coefficient for the portal cranes.To reveal the mechanism of reduction of the wind coefficient in such cases,this work presents a numerical study on the wind resistance characteristics of the container yard portal crane.Firstly,the variation of wind coefficient of gantry crane at various wind angles is studied by the CFD method and the conclusion that the most unfavorable wind direction for gantry crane is 30°to 45°is obtained.Then,the wind coefficients of different wind direction under different distance between two cranes are calculated by the CFD method and the relations of wind coefficients versus the distances is studied.Moreover,the table of wind reduction factor of two gantry cranes is also listed.The numerical results show that:in order to achieve the best comprehensive reduction effect of wind coefficient,the portal cranes should keep as close as possible,especially when the leg spacing is 5m,the wind coefficient of the front and rear portal cranes can be reduced by 93%and 42%respectively under the frontal windward condition,and can be reduced by 96%,93%and 97%,92%respectively for the most dangerous wind direction.The conclusion of the study provides reference for the de-sign of anti-storm of portal cranes.
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