MODIFIED FIXED-ANGLE STRUT-AND-TIE MODEL FOR HIGH STRENGTH REINFORCED CONCRETE BEAMS
Abstract: Nonlinear finite
element analysis was applied to various reinforced concrete beams using a set
of constitutive models established in the modified fixed-angle softened-truss
model (MFA-STM). The model was implemented by modifying the general-purpose
program FEAPpv. The model can take account of the six important characteristics
of cracked reinforced concrete: (1) the softening effect of concrete in
tension-compression; (2) the tension-stiffening effect of concrete in tension;
(3) the average stress-strain curve of steel bars embedded in concrete; (4) the
shear modulus of concrete; (5) the aggregate interlock; and (6) dowel action.
The comparison shows the aggregate interlock and dowel action can reduce the
overestimation of the shear capacity of high strength reinforced beam,
especially the high strength reinforced deep beam without web reinforcement.
Moreover, the model is suitable for being implemented numerical procedures due
its simplicity.
Author: Tavio
Journal Code: jptsipilgg110024
