Optimization Assessment of a Jib Crane Beam with Variable Web Corrugations Using Finite Element Analysis

Abstract

In construction industries, cranes are often used for lifting and transporting loads from one place to other. One of the simplest types of these cranes is a Jib crane which is used on a wide scale in construction industries. The integral part of the jib crane contains a hoisting mechanism that helps in raising and lowering loads, while trolley motions move loads horizontally. It must be ensured that the crane beam must be designed properly as per norms to get sufficient stiffness and strength to withstand the applied loads. Beams of these types of cranes are usually I-shaped in cross section, and lateral torsional buckling plays a critical role in determining the overall stability of the crane. In this study, finite element analysis of a cantilever, I beam S10@25.4 lb/ft of span 2.54 m is done to determine the buckling behavior when it is subjected to vertical load at its free end in addition to its selfweight. Models of these beams were made on AutoCAD and then analyzed on finite element modeling software ANSYS using a load multiplier. Moreover, a new design approach is proposed to study the lateral torsional behavior of the crane I beam under similar loading conditions by introducing trapezoidal corrugations in the web. For this analysis, 32 models having trapezoidal corrugations in the web with different variations in the angles, thickness and widths were proposed, and then the buckling capacity of the beam was determined to see its effects. From the finite element analysis results, it is observed that the corrugation angles of the plate substantially influence the buckling. Also, in this study, a comparative and cost-benefit analysis is done comparing a conventional beam without corrugation to a corrugated beam. It is found that corrugated beam is more economical, having lesser weight and higher buckling load capacity than the conventional flat beam.