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Beam cast on masonry wall

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It is a common practice at some places to cast rc beams directly on
walls
and thus to do away with vertical props , although these beams are
designed
to span between columns. The masonry wall is , of course, not
load-bearing
and rests either on plinth beam below or on nominal foundation. The same

procedure is carried out for upper floors as well. The argument put
forward
in its favour is that even if the beams are allowed to deflect freely
between
columns, this will usually be good for the initial deflection due to the
beam and slab
self weights only, because the wall would be in place before finishes or
partitions
are laid  so that these loads would in any case would  be tranferred
directly to the wall below. Also the long-term deflection due to creep
etc.
will also be taken by the wall below. The site may lie in seismic zone
2.
Comments are welcome.
M. A. Mufti