Abstract:
Currently, the building structures are constructed in different shapes to keep the functionality
of the building. Due to this, the reinforced concrete column may be subjected to two beams that
run in non-orthogonal ways (other than 90 degrees). However, there hasn't been enough
research done on the behavior of this type of column. The purpose of this study is to investigate
the behavior of a short non-orthogonal biaxially loaded reinforced concrete column. The FEA
software, which is Abaqus 6.14, was used for this study. Before modelling of the specimen, the
experimental study, which was done by Wang G.G. and Thomas Hsu C.T., was used as a
benchmark experiment and used for validation. The FEA results agreed with the experimental
results up to 84% . The concrete and steel properties, which were used for software input, were
prepared and modelling of the specimen was done. The Abaqus standard was used for
modelling of 270 column specimens, and Concrete damage plasticity for concrete and plastic,
for steel models, was used in the material property definition. Both tie and embedded region
constraints were used in the interaction module. Eccentricity, concrete grade, angle between
the axis of the moment, shape of the column, force, and displacement were variables considered
in this study. In which force and displacement were considered, as dependent variables and the
remaining were independent.
As eccentricity increases from 10 to 50mm along both directions for a short non-orthogonal
biaxially loaded reinforced concrete column, the load-carrying capacity of the column reduces
by an average value of 8.9% and the deflection increases by an average value of 12%. When
the angle between the axis of moment increases from 15o
to 90o
, the axial load-carrying
capacity of column reduces by an average value of 1.014% and its deflection increases by an
average value of 0.7342%. As the concrete grade increases from fck 20 to 30Mpa, the axial
load-carrying capacity of non-orthogonal RC columns, within interval, by an average value of
11.31% and the deflection reduces by an average value of 2.27%. The axial load-carrying
capacity of the non-orthogonal square RC column is higher than the rectangular by 1.44%, but
the deflection is smaller by 0.516%. For non-orthogonal biaxial moment, the circular column
axial load-carrying capacity is higher than square and rectangular by 0.192% and 1.66%,
respectively. Therefore, a circular column is preferable to other shapes of columns
