Resistance of RC Columns Exposed to Elevated Temperature : 3D FE Study : Master's Thesis

Tema diplomskog rada je bila istražiti utjecaj povišenog djelovanja temperature na nosivost i oštećenje betona armiranobetonskog stupa koji je prije izlaganja djelovanju visokih temperatura prethodno bio izložen djelovanju opterećenja silom. Nakon djelovanja visokih temperatura armiranobetonski stup je hlađen prema propisima hlađenja, a postupak opterećivanja stupa do sloma je izvršen nakon što se stup u potpunosti ohladio duž cijele svoje duljine i duž cijelog svog poprečnog presjeka. Napravljen je jedan model armiranobetonskog stupa te su prikazani proračuni i rezultati za dva validacijska slučaja stup A i stup B, te parametarska studija za stup A pri kojoj smo mijenjali različite iznose opterećenja, te različite duljine vremena djelovanja požara. Jedina razlika između stupova A i B je ta što je stup A napravljen od mreže kockastih konačnih elemenata HexMesh, a stup B od mreže tetraedarskih konačnih elemenata TetMesh.The topic of the thesis was to investigate the effect of elevated temperature action on the loading capacity and damage of concrete on a reinforced concrete column which had previously been exposed to force loads before exposure to high temperatures. After the impact of high temperatures the reinforced concrete column was cooled according to the cooling regulations, and the loading process of the column up to failure was made after the column had completely cooled down its entire lenght and cross section. One model of the reinforced concrete column was made and the calculations and results for the two validation cases column A and column B, as well as the parametric study for the column A, with varying loads and varying lenghts of fire time. The only difference between the columns A and B is that the column A is made of a mesh of cube end elements HexMesh solids, and the column B of a mesh of tetrahedral end elements TetMesh solids