Analysis of longitudinal girders torsion for crane bridges
This paper outlines the basic information on the development of the method to control the crane bridges longitudinal girders replacing the existing method of visual inspection control. The necessary conditions for data processing have been stated, the calculation of the crane bridges torsion have been given, the existing technique to execute the safety expert review while performing the longitudinal girders torsion test has been presented. It has been proposed to develop and use the instrument permitting to measure the longitudinal girders torsion most accurately. The factors having effect on the calculation and the crane bridge stress-strain state as a whole have been identified. The dependence of the mechanical properties of the longitudinal girder on the declivity angle has been demonstrated. The calculation for the most unsafe longitudinal girder cross-section has been performed. When writing the article, the analysis of crane bridges metalwork destruction has been conducted, the reason for such a high error has been stated. The measurements implementation chart recommended for the longitudinal girders torsion determination has been produced. The diagram to perform measurements with a plumb and thread has been demonstrated. The theory of the crane bridges metalwork behavior has been considered. The theoretical calculation for the beams tilted to one side at the same angle has been made. The dependence of the longitudinal girder deflection on the declivity angle, moving along the axes OY, OX has been outlined. Based on the analysis of the obtained results and observations, the conclusions on the declivity angle effect on the metalwork have been made. The paper is aimed at further studying of the declivity angle effect of the longitudinal girders on the metalwork behavior