Makarov A. Dynamic analysis, testing and diagnostics of steel structures of large-span bridge loading cranes

Object of research - stress-strain state (SSS) of the main bearing hardware bridge loading cranes under dynamic loads. Aims of the work: comprehensive analysis of dynamic characteristics of metal cranes to the development of methods dynamic calculations and dynamic natural tests with the development of proposals for dynamic diagnosis and certification of structure. Research methods. For the analysis of SSS and mathematical modeling of dynamic constructions characteristics were used: finite element method; Runge - Kutta 4th order to solve differential equations of motion; dynamic methods of diagnosis and vibrodynamic inspection of building structures. Theoretical and practical results: it was devised the technique of dynamic inspection of construction cranes with assembly of dynamic passports; the application engineering dynamic models for solving problems of traffic load and the damping by dynamic quencher fluctuations will be calculate the dynamic characteristics and SSS for more correct circuit that can reduce of dynamic stresses in structures and ensure efficiency appliances and the equipment specified level of machinists' comfort. Novelty of the research: first on the basis of comprehensive research it was established the link parameters of natural oscillations of spatial models bearing structures of bridge loading cranes with major variations possible damage; trellised scheme for this method of construction and fragments of the "Atlas of impact damage on the natural frequencies and forms"; improved development of simplified models of bridge loading cranes that are designed for rapid analysis of engineering statics and dynamics bridge crane towers, the conducting accelerated calculation; conducted full-scale tests and theoretical calculations that have provided first time for such cranes in the dynamic characteristics of the main technological modes and confirm full and simplified computer models; first for bridge loading cranes was solved the problem in the time field simulation of the dynamic interaction of inertial structures with trolley bridge - like moving inertial load; obtained comprehensive data collected in a dynamic passports for specific spatial mechanical systems girder cranes tubular-type. Implementation extent: the results and methodology of the project were implemented in practice of Ltd. Design Institute "Dniproproektstalkonstruktsiya"and PJSC "Dzerzhinsky Dnieper Metallurgical Plant" to reduce the amplitude of oscillations, preventing accidents and certification of cranes; in the educational process "PSACEA." Range of application: industrial building; mechanical engineering.