Nieliniowa analiza płyt i tarcz żelbetowych metodą elementów skończonych

THIS IS THE INTEGRATED FINITE ELEMENT MODEL FOR REINFORCED CONCRETE SLABS AND DISCS. The first step of the nonlinear procedure consists in finding the so¬lution of the elasticity problem for a doubly reinforced concrete slab. Ten different cracking patterns are assumed in this formulation. Use of each pattern implies the division of slab thickness into several layers (maximum three layers of concrete). This enables the replacing of the summation of constituent stiffnesses over the layers, as is the case in the layered method, by the appropriate analytical or simple numerical integration through the total thickness. This method allows for the non¬linear analysis of relatively low numerical effort in comparison with layered anal¬ysis, although the tips of the considered cracks need not lie on the interfaces of the layers. Results obtained in the proposed approach are compared with experi¬mental evidence from tests performed on deep beams and slabs published by other researchers.