Analysis of Internal Force and Deformation of Existing Crane Girder Structure Under Large Tonnage Crane Loads

In the theoretical calculation of crane beams, the influence of the stiffening ribs of the web plate on its load carrying capacity and deformation is not considered, which leads to a large discrepancy between the theoretical calculation results and the measured data. Taking the example of upgrading a small-tonnage crane to a large-tonnage crane in the assembly workshop of a single-story light steel structure plant as the background, a correction method is proposed based on the field test results of the structural internal forces and deformations of crane beams under the loads of large-tonnage cranes. The method considers the influence of web stiffening ribs on the load carrying capacity and deformation of the crane girder, and adjusts the established deformation theory and stress calculation of the crane girder accordingly, as well as corrects the deflection theory and stress theory. The purpose of the correction is to solve the problem of neglecting the influence of web stiffening ribs in the theoretical calculation of crane beams. The analysis results show that the crane girder is still in the elastic working stage after the small tonnage crane is upgraded to large tonnage. The corrected theoretical calculation values are more in line with the test values, but some crane girders still have small errors, which may be due to the existence of other influencing factors not considered in the actual measurement process.