Abstract
Tower crane is a kind of construction machinery which be widely used in building, bridge, electric power construction. The factor for hoisting a grounded load is one of main factors for dynamic analysis and structure design of tower crane. Different structural forms of tower crane have different effects on the factor for hoisting a grounded load. The finite element models of QTZ125 tower crane with different top-structure form are build and the first six order inherent frequencies and vibration modes are analyzed. Then the factors for hoisting a grounded load at lifting velocity of 0.2~0.5m/s under lifting operation condition are calculated. Based on the results, the influence of the different top-structure of the tower crane to the dynamic characteristic and the factor for hoisting a grounded load is prominent, and the factor for hoisting a grounded load of support-rod type tower crane is less than the tower-cap type tower crane.
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