Concrete shell computation with determination of rheological properties of concrete

Prikazan je model i razvijeni software za proračun betonskih ploča i ljusaka opterećenih dugotrajnim statičkim opterećenjem. Simulirana je materijalna i geometrijska nelinearnost. Modelirano je puzanje, skupljanje i starenje betona, tečenje betona u tlaku, otvaranje i zatvaranje pukotina u vlaku te vlačna i posmična krutost puknutog betona. Modelirano je i nelinearno ponašanje armature. Primjer ilustrira točnost i neke mogućnosti primjene modela i proračunskog programa VALJ.The model and software for the computation of concrete slabs and shells exposed to a prolonged static load is presented. The material and geometrical nonlinearity is simulated. The following features are modeled: creep, shrinkage and aging of concrete, concrete flow under pressure, opening and closing of cracks subjected to tensile stress, and tensile and shear stiffness of cracked concrete. The nonlinear behavior of steel reinforcement is also modeled. The example shown illustrates the accuracy and some possible uses of the VALJ model and computational software