EXPERIMENTAL METHOD FOR STRUCTURAL CONCRETE DAMPING PROPERTIES EVALUATION
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Abstract
This article proposes a solution for structural materials such as concrete and cement mortars dynamic properties investigation using experimental modal analysis technique. The studied dynamic characteristics of structural materials include the dynamic modulus of elasticity and the loss factor or its derivatives: the logarithmic oscillation decrement or the relative damping coefficient. Closed expressions are presented for determining the loss factor of mechanical vibrations, obtained on the basis of solving the differential equation for vibrations of a single-mass dynamic system. A method for calculating the loss factor based on the analysis of the spectrum of the transfer function of an oscillatory system loaded with an impulsive dynamic force is presented, in which the results of measuring accelerations at various points of the sample are used as a response. The experiments were carried out on short and long samples made from samples of structural materials - cement mortars with a density of 1500 - 1900 kg/m3 with special aggregates. Based on the solution of the equation of oscillations of a beam with distributed masses, a formula is presented for determining the dynamic modulus of elasticity of the beam material.
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References
Ahid D. Nashif and David I. G. Jones. Vibration damping.Wiley, 1991 – 480 p.
Rossikhin Yu.A, Shitikova M.V. (2014b) Nonlinear dynamic response of a thin plate embedded in a fractional viscoelastic medium under combinational internal resonances. Appl Mech Mat 595: 105—110 DOI: https://doi.org/10.4028/www.scientific.net/AMM.595.105
Rossikhin Yu.A., Shitikova M.V. (1998) Application of fractional calculus for analysis of nonlinear damped vibrations of suspension bridges. ASCE J Eng Mech 124:1029—1036А. DOI: https://doi.org/10.1061/(ASCE)0733-9399(1998)124:9(1029)
M. Neville. properties of concrete. Abridged translation from English tech. Sciences V. D. PARFENOVA and T. Yu. YAKUB. Publishing house of literature on construction. M.: - 1972, 345 pages.
Inozemtsev A.S., Korolev E.V. Deformations of high-strength lightweight concretes on hollow microspheres and a way to reduce them // Stroitelnye materialy. 2015. No. 9. pp. 23-30.
Inozemtsev A.S., Korolev E.V. Comparative analysis of the influence of nanomodification and microdispersed reinforcement on the process and parameters of destruction of high-strength lightweight concretes. Stroitel'nye materialy. 2017. No. 7. pp. 11-15. DOI: https://doi.org/10.31659/0585-430X-2017-750-7-11-15
O. Døssing, “Structural Testing 1 (Mechanical Mobility Measurements).” Brüel & Kjær, 1988.
O. Døssing, “Structural Testing 2 (Modal Analysis and Simulation).” Brüel & Kjær, 1988.
Myklestad, N.O. (1952) The concept of complex damping, J. of Applied Mechanics, pp. 284-286. DOI: https://doi.org/10.1115/1.4010499
Lazan, B.J. (1968). Damping of Materials and Members in Structural Mechanics, Pergamon Press.
Kohoutek, R. (1992). Damping of concrete beams of different mix design, Proceedings of Materials Week’92, 2–5 November, Conference at Hyatt Regency, Chicago, pp95-102.
Zaveri, K. and Olsen, H.P. (1972). Measurement of elastic modulus and loss factor of asphalt, Technical Review No.4, Bruel & Kjaer, pp. 3-15.
Kohoutek, R, (1985). Analysis of beams and frames, Chapter 4 in Analysis and Design of Foundations for Vibrations, pp. 99-156; P. Moore, ed., 512pp, 1985, published by A.A. Balkema.
Khemapat Tontiwattanakul, Jirawin Sanguansin, Vatanavongs Ratanavaraha, Vanchai Sata, Suchart Limkatanyu, Piti Sukontasukkul, Effect of viscoelastic polymer on damping properties of precast concrete panel, Heliyon, Volume 7, Issue 5, 2021, e06967, ISSN 2405-8440, https://doi.org/10.1016/j.heliyon.2021.e06967. DOI: https://doi.org/10.1016/j.heliyon.2021.e06967
Lei B, Liu H, Yao Z, Tang Z. 2019 Experimental study on the compressive strength, damping and interfacial transition zone properties of modified recycled aggregate concrete. R. Soc. open sci. 6: 190813. http://dx.doi.org/10.1098/rsos.190813 DOI: https://doi.org/10.1098/rsos.190813
Van Velsor, Jason & Premkumar, Laxmikanth & Chehab, Ghassan & Rose, J. (2011). Measuring the Complex Modulus of Asphalt Concrete Using Ultrasonic Testing. Journal of Engineering Science and Technology Review. 4. 10.25103/jestr.042.08. DOI: https://doi.org/10.25103/jestr.042.08