RT Journal Article SR Electronic A1 Bujnak, Jan A1 Korol, Elena A. A1 Latushkin, Vasily E. T1 Design Calculation Model of Three-Layer Composite Reinforce Concrete Structures JF Communications - Scientific Letters of the University of Zilina YR 2012 VO 14 IS 1 SP 101 OP 105 DO 10.26552/com.C.2012.1.101-105 UL https://komunikacie.uniza.sk/artkey/csl-201201-0020.php AB The three-layer structures with a thermal insulation layer of small strength concrete keep the intermediate place between the standard reinforce concrete structures and composite constructions. The calculation model in which the cross-section of three-layer structure is substituted by I-beam homogeneous section of imaginary higher strength concrete is selected. The executed analysis have verified the possibility to use the I-beam transformed section model even for the calculation of three-layer composite reinforce concrete structural elements.