Finite Element Analysis and Reinforcement of Steel Crane Beam under Eccentric Track Loading

Abstract

The crane track of a steel structure workshop was installed eccentrically, and the crane operation caused a large deflection of the crane beam, requiring reinforcement measures. The finite element model of the crane beam was established by Midas Gen finite element software, and the maximum stress, deflection, and the stress amplitude of 9 m and 12 m steel crane beam under different track eccentricity values were analyzed. The results show that when there is no brake truss, the maximum stress and deflection of the crane beam will increase greatly under the action of eccentric loading. On the contrary, a brake truss can effectively reduce the adverse effect of eccentric loading; the fatigue strength of crane beam cannot be controlled under eccentric rail loading. The reason why steel crane beam is sensitive to track eccentricity is that its torsional stiffness is too small. As a reinforcement measure, welding angle steel or steel plate lower on the crane beam flange, forming a box section, can effectively increase the torsional stiffness of the crane beam; the residual stress can then be effectively reduced by applying intermittent welding and reinforcement using the same material.