Abstract
AbstractIn reinforced concrete structures under cyclic loads one of the types of failure is fatigue failure of working reinforcement. Operation mode of steel reinforcement in reinforced concrete constructions is non-stationary irrespective of loading conditions. In these cases determination of fatigue resistance of reinforcement requires a great number of experiments which requires a great number of financial and manpower resources. The aim of the work is to develop a theory of fatigue cracking of steel reinforcement and to create design models of reinforcement with cracks. For this purpose it is necessary: to establish the scheme of fatigue crack formation in reinforcement rods for reinforced concrete structures; to develop the equation of change in specific energy of steel fracture in the zones of crack formation and development; to develop a methodology for calculating the durability of steel reinforcement with cracks.Theoretical research of fatigue strength of steel reinforcement has been carried out. It is established, that fatigue failure of steel reinforcement is characterized by formation and development of micro and macro cracks in metal structure up to critical dimensions; two basic stages are derived: to the formation of micro and macro fatigue cracks; development of macro-fatigue cracks to critical dimensions. The methods of fracture mechanics of elastic–plastic materials were used for modeling of steel reinforcement operation under cyclic mode of deformation and the equations of mechanical characteristics change of reinforcement under different modes of cyclic loading were obtained using these methods. On the basis of theoretical research the equations of change of basic force parameters of steel reinforcement, allowing developing analytical formulas for evaluation of fatigue strength under cyclic loading, have been obtained.KeywordsSteel reinforcementStress structure profileFatigue crackDamagePlastic resourceSpecific energyCreep stress of concreteElastic operation of reinforcement
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
