Zusammenfassung
Based on the orthotropic hypoelasticity formulation, a triaxial constitutive
model of concrete is proposed. To account for increasing ductility
in high confinement of concrete, the ductility enhancement is considered
using so called the strain enhancement factor. It is also developed
a three-dimensional finite element model for reinforced concrete
structural members based on the proposed constitutive law of concrete
with the smeared crack approach. The concrete confinement effects
due to the beam-column joint are investigated through numerical examples
for simple beam and structural beam member. Concrete at compression
fibers in the vicinity of beam-column joint behaves dominant not
only by the uniaxial compressive state but also by the biaxial and
triaxial compressive states. For the reason of the severe confinement
of concrete in the beam-column joint, the flexural critical cross-section
is observed at a small distance away from the beam-column joint.
These observations should be utilized for the economic design when
the concrete structural members are subjected to high confinement
due to the influence of beam-column joint.
Nutzer