Based on the inverted triangle cargo boom of ST80238 tower crane as the research object, the author took its local down chord as calculation model. ANSYS software is applied to impose the constraints and loads on the model, and the stress and deflection are analyzed. The results show that the top flange of the down chord and the web will be influenced by the axial force of the oblique truss, and larger local stress in the joint position and the surrounding of the oblique truss and the down chord are produced, as well as the largest local stress will be produced in the centre of the connective position, and reducing gradually to the surrounding. In the condition of the box section center line of the down chord is constant, moreover the size of the down flange and the web is increased, and the local stress and vertical deflection nearby the joint of the oblique truss and the down chord will be reduced. Though the research, the local instability of down chord of ST80238 tower crane can be prevented,and a direct reference and basis for box beam of down chord can be provided.
In order to improve the interchangeability of a standard section and determine the tower body of the optimal combination-matching, taking 45 combination schemes of three models of tower cranes for example, the ANSYS for hoist boom at working state of the diagonal of tower body have been used to make the calculation and analysis, the distribution map of the total displacement and the axial force at this condition have been obtained. According to the results, the stiffness, strength and stability of tower body have been analyzed. The tower body of the optimal combination-matching is chosen by the fuzzy evaluation method. It is proved that the optimal combination-matching through the fuzzy evaluation method is accord with production requirement.
This paper is carried out the analysis on structure stress characteristics of the top and low slewing frame of ST6020 tower crane, and gets the stress contours under different working conditions. According to the stress state of the structure and the adjustments of the structure scheme, rational structure of the top and low slewing frame is obtained.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.