STUDIES REGARDING THE STATE OF STRESS AND STRAIN IN WINDBRACING BARS OF THE GANTRY CRANES. THE DYNAMIC ANSWER AT THE DISPLACEMENT OF THE CRANE’S CARRIAGE UNDER CONSTANT LOAD

Abstract

The present paper is a part of a succession of analysis concerning the behavior of the loaded gantry crane. One achieved the conclusion that researches based on modern software are necessary("strong software”)new designing, tests and checking methods of the lifting plants. In the final purpose (target)is to increase the working safety; at its base stands the precise knowing of the state of strain both in the assembly and in the elements. Of great importance is the knowing of the structure’s answer in static and dynamic state, mainly expressed through the values of the stress and strain field. The paper contains, mainly, information concerning the dynamic answer of the stress in windbracings at the shift of the crane’s carriage subjected to a constant load, the effect of the longitudinal and transversal swinging of the load lifted by the crane, conclusions regarding both the state of stress and the sectional(cross section)internal forces in the maximum loaded beams of the crane(elements).