Journal of
Faculty of Civil Engineering

CONFERENCE PROCEEDINGS
5th INTERNATIONAL CONFERENCE
CONTEMPORARY ACHIEVEMENTS IN CIVIL ENGINEERING 2017 , 2017.y., pp. 277-286

	DOI: 10.14415/konferencijaGFS2017.028
	UDC: 624.04.012
	CC-BY-SA 4.0 license
	Author : Milašinović, Dragan D., Goleš, Danica
	Summary:
	Non-destructive test methods are a valuable tool in determining the parameters of materials, because on the same samples can be repeated several times. This is of particular importance in structures made of materials whose properties change over time, such as concrete, reinforced concrete and pre-stressed structures. Determination of the dynamic modulus of elasticity and the resonant frequency of the acoustic response gives adequate data, on which the rheological-dynamical analogy is based. Analogy combines dynamic rheological model and damage mechanics. Within this approach are functionally related key parameters of the continuum, such as Poisson's ratio and the scalar damage variable. Ultimate strain is determined by the secant stress-strain relation from fracture mechanics. The result of this analog modeling is working diagram of concrete, which is in this paper determined as average, based on several cylindrical samples of concrete tested by non-destructive methods. Thus established working diagrams are used to analyze the rotational capacity of reinforced concrete beam in bending.
	Keywords:
	Reinforced concrete structures, rheological-dynamical analogy, nondestructive test methods, model of concrete