Title Įtempių- deformacijų būvio parametrų apskaičiavimas lenkiamų gelžbetoninių elementų stačiakampiame skerspjūvyje, taikant EN-2 kreivinę betono įtempių diagramą /
Translation of Title Calculation of stress-strain state parameters at rectangular cross-sections of flexural reinforced concrete members according to EN-2 curvilinear concrete stress diagram.
Authors Larionovas, Vytautas ; Užgrindis, Tautvydas ; Židonis, Ipolitas
Full Text Download
Is Part of Jaunųjų mokslininkų darbai.. Šiauliai : Šiaulių universiteto leidykla. 2013, Nr. 1, p. 159-167.. ISSN 1648-8776
Keywords [eng] concrete ; reinforced concrete ; beams ; curvilinear stress diagrams ; strain
Abstract [eng] The width of vertical cracks of flexural reinforced concrete members mostly depends on the tensile zone reinforcement strain ξs of the member. In order to calculate the values of deflections of members with cracks in the stretching zone, it also necessary to know the value of concrete strain ξc in the compression zone of a member. There are three unknowns: ξs, ξc and x. For the calculation of the value of x the STR analysis method employs an empirical formula. A highly conditional rectangular compressive zone concrete stress diagram is used, which is a shortcoming of the present method. In this research, the value x is calculated theoretically by using the ZI method prposed by the third author of the present paper. The research uses the Eurocode (EN-2) curvilinear stress-strain relation for concrete in the compression zone. This relation is then replaced by an easy-to-integrate 3rd degree equation. The parameters of the equation are calculated according to the EN-2 formulae. The required reliability of the strength of the compression zone of the concrete of the beam is achieved by dividing the force by the partial factor for force (safety factor). The value of the factor can be assumed to be equal to 1.3. the values of x, ξs and ξc are calculated using the ZI method and then compared with the values calculated using the STR method. The paper analyses the most important strength classes of the regular concrete, which are indicated in the EN-2 regulations. The reinforcement of the beams is regular and ranges from low to high. The results of the calculation are very good. The ZI method is suitable not only for the values of x, ξs and ξc of beams but also for the analysis of the impact of various factors on them.
Published Šiauliai : Šiaulių universiteto leidykla
Type Journal article
Language Lithuanian
Publication date 2013