When to design as a column as axially loaded.
Referring to the floor plan shown in the video, it
can be seen that column B2 supports beams which
are equal in length and symmetrically arranged.
Provided the floor is uniformly loaded, column
B2 will resist an axial load only and should
be designed as such.
Column C2 supports a symmetrical arrangement
of beams but which are unequal in length. Column
C2 will, therefore, resist an axial load and moment.
However, provided that 1., the loadings on the
beams are uniformly distributed, and 2., the beam
spans do not differ by more than 15 per cent of the
longer, the moment will be small. As such, column
C2 can safely be designed by considering the axial
load only but using slightly reduced values of the
design stresses in the concrete and steel reinforcement
as outline in bs8110 code.
When to design as a column as Uni-axially loaded.
columns A2, B1, B3, C1, C3 and D2, supports an
arrangement of beams that
is clearly unbalanced in one of it axis, consequently,
The moments acting on these columns
becomes significant and the column may be
required to resist an axial load and uni-axial bending.
When to design as a column as Bi-axially loaded.
Columns A1, A3, D1 and D3. supports an arrangement of beams that
is clearly unbalanced in both of it axes, and as such should
be designed to resist an axial load and biaxial bending.
Негізгі бет How to know if a column is Axially, Uni-axially or Bi-axially loaded from floor plan
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