Civil Engineering Association

Finite Element Analysis Of Reinforced Concrete Structures Under Monotonic Loads

This study deals with the finite element analysis of the monotonic behavior of
reinforced concrete beams, slabs and beam-column joint subassemblages. It is assumed that
the behavior of these members can be described by a plane stress field. Concrete and
reinforcing steel are represented by separate material models which are combined together
with a model of the interaction between reinforcing steel and concrete through bond-slip to
describe the behavior of the composite reinforced concrete material. The material behavior of
concrete is described by two failure surfaces in the biaxial stress space and one failure surface
in the biaxial strain space. Concrete is assumed as a linear elastic material for stress states
which lie inside the initial yield surface. For stresses outside this surface the behavior of
concrete is described by a nonlinear orthotropic model, whose axes of orthotropy are parallel
to the principal strain directions. The concrete stress-strain relation is derived from equivalent
uniaxial relations in the axes of orthotropy. The behavior of cracked concrete is described by
a system of orthogonal cracks, which follow the principal strain directions and are thus
rotating during the load history. Crushing or cracking of concrete takes place when the strains
lie outside the ultimate surface in the biaxial strain space.

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