Geometric Parameters Design And Study Of Crane Statically Indeterminate Jib

With the development of high-rise and large-scale building, tower crane is widely used because of its large working radius,high lifting speed and fitting to small construction site area. Tower development is toward the direction of large,high-speed and specific. Jib is the main component of tower crane,which is designed reasonable or not affects the stability and lifting capacity. Therefore, jib design is essential to the tower crane.The tower crane of trolley mechanism, jib is also the orbit of trolley, which should not have large deflection after loading from the technology point of view. Both strength and rigid should be consider as the key elements for jib design. Double hanging points jib is one degree of indeterminacy, whose calculation of internal force and deformation and hanging point position of is complex than angle point one. Tie-bar play a limited role on restricting the jib deformation, the rigid of which affect the whole deformation of jib. Hanging points, and the angle between tie-bar and jib impact on the stress of jib and bearing capacity. So it is very necessary to define the points of hanging and the angle between tie-bar and jib.This paper describe the development status of tower crane at home and abroad, and establish mechanical model based on elasticity theory, and propose to design hanging points from the perspective of strength and rigid. Calculate the force of single and double hanging points jib under typical condition respectively, and define the points of hanging of simple beam with cross-section preliminary take advantage of formula based on full stress principle. The beam is divided into three variable cross-section with the boundary of hanging points.Adjust the hanging points and angle between jib and tie-bar,and take the weight as objective function and optimize hanging points by ansys. Identify the design variables of substantial impact by sensitivity analysis in the the results of optimization that is beneficial to understand the impact on the objective function. Draw deformation curve of typical condition based on deflection curve equation,and design the upper angle for the antilever large deformation. Hanging points are recommended for different amplitude tower crane of trolley mechanism.