PSI - Issue 13

I.N. Shardakov et al. / Procedia Structural Integrity 13 (2018) 1362–1366 Author name / Structural Integrity Procedia 00 (2018) 000–000

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4. Conclusion The mathematical model presented in this paper describes the elastic deformation dynamic interaction of the elements of the "striker - gasket - reinforced concrete beam" system. The numerical experiment based on this model shows dependences of duration of the impulse action on a reinforced concrete beam from various factors. These dependences determine parameters of local impulse force which causes excitation of mechanical vibrations of desired spectrum in the structure and also excites an elastic wave with necessary characteristics of the wave front. Thus, within a specified range of these factors the greatest interval of impulse duration is obtained under variation of the striker velocity within the interval from 0.1ms to 2.9ms. Assuming that the impulse duration defines one of the main wave frequencies of vibrations one may conclude that frequencies will vary in the range from 300Hz to 10000Hz. The algorithm developed in this study allows us to find a constructively acceptable combination of factors (mass, radius and velocity of the striker, elasticity modulus and thickness of the gasket), which will provide the required spectrum of wave frequencies for vibration diagnostics of the elements of reinforced concrete structures. Acknowledgements The research was performed at the Institute of Continuous Media Mechanics Ural Branch of Russian Academy of Science, with the support of the Russian Science Foundation (project №14-29-00172). References Bykov A.A., Matveenko V.P., Serovaev G.S., Shardakov I.N. & Shestakov A.P., 2015. Mathematical Modeling of Vibration Processes in Reinforced Concrete Structures for Setting Up Crack Initiation Monitoring. Mechanics of Solids. Vol.50, № 2, 160-170. Carpinteri A, Lacidogna G., 2002. Structural monitoring and diagnostics by the acoustic emission technique: scalling dissipated energy in compression. Proceeding of the 9th Int. Congress on Sound and Vibration (ICSV9) Orlando. 2002 Lurie, A.I., 2005. Theory of elasticity. Springer, Berlin, pp. 1007. Shardakov I.N., Fedorova V.A., Glot I.O., Melnik O.E., 2014. Modeling of ground deformation in the vicinity of the Soufriere Hills volcano. Computational Continuum Mechanics Vol.7, №4, 444-452. Tsvetkov R.V., Shardakov I.N., Shestakov A.P., 2013. Analysis of wave propagation in underground gas pipelines in the context of the problem of designing the intelligent monitoring systems. Computational Continuum Mechanics Vol.6, №3, 364-372.