Volume 1, No. 2, 2007
Received: 2008/08/26, Accepted:
Authors:
M. M. Smadi; K. A. Belakhdar;
Abstract:
A nonlinear finite element code has been developed to suite the analysis of normal and high strength concrete
slabs. The computer program was built up using two computer languages, where the program interface part was
coded in Visual-Basic language, while the main part was coded using FORTRAN language. A software called
NLFEAS (Non-Linear Finite Element Analysis of Slabs) was developed to predicate and study the three
dimensional response of reinforced concrete slabs of different grades, variables and boundary conditions under
monotonically increasing loads. Using symmetry, a segment representing one quarter of the slab was considered
in the analysis which was modeled using 20-node isoparametric brick elements and a 27-integration rule
(3*3*3). Proper numerical material models for cracked concrete were incorporated in the analysis. The
efficiency and accuracy of the developed code was verified through comparison with available test data, which
showed good agreement. The effects of some finite element parameters such as mesh refinement and integral
rule were also investigated.
Keywords:
Nonlinearity, Finite Element Analysis, Material Modeling, Concrete Slabs, NLFEAS Code, Preprocessor Layer, Postprocessor Layer.