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	CORRECTION OF FATIGUE PARAMETER VALUES OF CONCRETE USING APPROXIMATION OF MECHANICAL-FRACTURE PARAMETER VALUES IN TIME Simonová, H. ; Kersner, Z. ; Seitl, Stanislav Selected approximation curves of mechanical-fracture parameter values modulus of elasticity, effective fracture toughness, specific fracture energy, compressive cube strength, splitting tensile strength, maximum load force in time are used to determine the most accurate fatigue parameter values corresponding to the age of specimens when dynamic tests were performed. Detailed record
	Vliv šířky zářezu na lomovou odezvu ohýbaných betonových vzorků Veselý, V. ; Keršner, Z. ; Seitl, Stanislav ; Klusák, Jan An influence of the test specimen’s preparation – shape and width of a stress concentrator – on the values of parameters of nonlinear fracture models of quasi-brittle cement-based composites is analyses in the paper presented. The parameters – e.g. effective crack extension, effective fracture toughness, and specific fracture energy – can be calculated from results of loading tests performed on notched three point bend specimens. The effects are investigated by means of a comparison of numerically simulated fracture process in the cracked specimen with the specimens with the double V-notch. The numerical simulations of the fracture according to the linear elastic fracture mechanics were performed by using finite element method programs (ANSYS, and FRANC2D). The influence on the load-carrying capacity and the initial compliance of the cracked specimen are introduced and discussed. Detailed record
	Influence of notch width and length on crack initiation in 3PB specimens Seitl, Stanislav ; Klusák, Jan ; Keršner, Z. The paper presents the influence of the various notch depths for the range of starting notch width on a crack initiation in three-point bending specimens. These specimens are the most frequently used for fracture laboratory testing, especially of quasi-brittle cement-based composites. It is shown that the values of fracture toughness obtained from the tests of specimens with larger widths with various length of the starting notch can be overestimated. Detailed record

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