Modeling the stress-strain state of crane metal structures

Abstract

The intensification of construction production imposes very strict requirements on the safety of construction machines. When carrying out lifting and hoisting operations using overhead cranes, production safety is primarily determined by the technical condition of the undercarriage and crane runways, as well as metal constructions. The authors deal with the issues related to modeling and research of the stress-strain state of metal structures of an overhead crane. A model of the crane metal structure is proposed, which includes the main and end box-section crane girders. To study possible geometric movements of the crane, a model of an overhead crane was designed in KOMPAS-3D software environment. The model contains main and end box-section girders. The model allows determining the maximum possible misalignment of the crane and runout of one of the sides. To determine the bending, tensile and compressive stresses in the bridge truss and the deformations of the crane metal structures, depending on the working loads, a 3D model of the bridge crane was created in the ADW Winmachine software environment. With its help, the bending stiffness of the crane bridge was established. These values are necessary to compile a mathematical model of an overhead crane as a control object in the synthesis of an automatic control system.

Safety assessment research of crane metal structure based on stress monitoring data of dangerous sections

“…According to relevant strength verification theories [3,4] , the strength of dangerous sections can be assessed by calculating the ratio of the material's allowable stress to the stress experienced by the dangerous section during the actual loading process (i.e., strength margin). Furthermore, the fatigue failure of crane metal structures subjected to varying loads results from the accumulation of fatigue damage caused by loads with different frequencies and amplitudes [5,6] . The anticipated fatigue life aligns with the theories of cumulative fatigue damage and can be estimated by monitoring the corresponding fatigue load spectrum while making reasonable assumptions.…”