A non-linear three dimensional finite element model for studying torsional behaviour of reinforced concrete beams is described. The primary objective is to identify the important material and solution parameters which affect this type of analysis. The model is compared with experimental tests on rectangular - and L-beams.

Twenty-noded isoparametric brick elements with embedded reinforcement bars are employed. The analysis uses standard non-linear solution procedures based on modified Newton-Raphson incremental-iterative techniques in which secant stiffnesses are varied. Concrete crack initiation, propogation and postcracking behaviour is modelled by a smeared crack approach. Multiaxial constitutive laws and crushing criterion for concrete in compression, and yielding of steel are also included.

Torque/twist curves, ultimate strengths, unit lengthening of beams and steel behaviour are illustrated. The effect of boundary conditions and shear transfer models are also presented. It is concluded that the model is sufficiently accurate and reliable to use for in-depth parametric studies of reinforced concrete beams of various cross-sectional shapes.

purchase the full-text of this paper (price £20)

go to the previous paper
go to the next paper
return to the table of contents
return to the book description
purchase this book (price £90 +P&P)