Dependence of Strength Enhacement on Shock Front Overpressure: The Case of RC Structures Gel betonini konstrukcij sl gimo bangos vir sl gio ir stiprio did jimo priklausomyb

The paper considers problems related to the assessment of the effect of loading rate on mechanical properties of concrete and reinforcing steel. The attention is focused on the evaluation of varying straining rate of RC structure subjected to explosive loading. The key problem considered in the paper is the derivation of the relation between the rate of pressure increase and incident overpressure. The paper considers approaches to modelling the influence of straining rate on mechanical properties of concrete and reinforcing steel. The main conclusion following from the paper is that the deterministic models used for the assessment of effect of straining rate on the mechanical properties of concrete and reinforcing steel and models used for modelling of incident overpressure are fairly imprecise and require for the stochastic modelling of this phenomena. Article in English Straipsnyje analizuojama apkrovimo grei io betono ir armatūros mechanin ms fizikin ms savyb ms taka. Daugiausia d mesio skiriama gel betoninei konstrukcijai, veikiamai sprogimo bangos sukelto sl gio, betono ir armatūros, deformacij , grei iui nustatyti. Straipsnyje pasiūlyta apkrovimo grei io priklausomyb nuo krentan ios sprogimo bangos vir sl gio. Analizuojami deformacij grei io takos betono ir armatūros mechanin ms ir fizikin ms savyb ms vertinimo metodai, deterministini metod , naudojam deformacij grei io takai vertinti, betono, armatūros dinamini ir mechanini savybi netikslumai. Siūloma konstrukcij , veikiam sprogimo apkrovos, dinamin ms mechanin ms fizikin ms charakteristikoms nustatyti naudoti tikimybin modeliavim vertinant atsitiktinius ir episteminius neapibr tumus. Straipsnis angl kalba