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Numerična analiza mehanskega odziva naknadno prednapetega betonskega nosilca z nepovezanimi ukrivljenimi kabli = Numerical analysis of a posttensioned concrete beam with unbonded curved cables
Kočman, Peter ; Bratina, Sebastjan ; Kolšek Češarek, Jerneja, 1984-
V članku predstavimo matematični model in ustrezen numerični postopek za analizo mehanskega odziva naknadno prednapetega betonskega nosilca z nepovezanimi ukrivljenimi kabli pri delovanju ...kratkotrajne statične obtežbe. Betonski del nosilca, ki je v splošnem armiran z mehko armaturo, modeliramo z Reissnerjevim modelom ravninskega nosilca, prednapete kable, ki potekajo znotraj betonskega nosilca, pa z modelom vrvi. Pri tem upoštevamo, da se kabel in betonski nosilec na medsebojnem stiku lahko zamakneta, ne moreta pa se razmakniti. Pojava lokalizacije deformacij in mehčanja betona v tlaku, ki običajno nastopita pri visokih nivojih obremenitev, modeliramo s t. i. »crack-band« modelom, s katerim omenjena pojava omejimo na končno dolžino nosilca. Primernost in natančnost razvitega modela prikažemo s primerjavo numeričnih in eksperimentalnih rezultatov mehanskega odziva prostoležečega in kontinuirnega nosilca, za katera so v literaturi na voljo dobro dokumentirani eksperimentalni rezultati. Ugotovimo zelo dobro ujemanje rezultatov.
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