|
BD-FQ-01.
How
do I neglect the Shear Capacity of concrete during
Beam Design?
Answer
: Program
reads the shear capacity parameters for the concrete
from the file BRCCPAR.DAT. If the shear capacity
of concrete is to be neglected this file shall
be modified and the capacity of concrete for shear
shall be changed to zero.
BD-FQ-02.
How do I use Mild Steel bars of 8/10/12 diameter
for Shear Reinforcement in Beam?
Answer
:Program
does not have facility to define 8mm, 10mm, 12mm
bar diameter of lower value Fe say 250 only for
stirrups and higher Fe say 415 for main bars.
BD-FQ-03.
How do I use Space frame Analysis results for
designing Beams?
Answer
:The
main feature of this software is that after the
SPACE FRAME ANALYSIS is done user can design the
beams level wise. When we select a particular
floor level and give beam design command program
reads the forces of the appropriate members at
that level and writes in a temporary file with
the extension .BEM. When we run the automatic
design procedure .BEM file is read and database
file .RBDB is created. Further in the interactive
design procedure these data files are referred
and not original .BEM file. Thus any parameters
stored for a particular component say B5, B8 concrete
grade, cover to reinforcement etc. is stored individually
for every beam in the entire project.
BD-FQ-04.
How do I avoid 10mm bars in Beam Design?
Answer
:The
Beam design program uses the standard data files
in which the areas of bar combinations are stored
for bottom and top reinforcement. There are two
such data files used during Beam Design namely:
1.
BEAMBOTB.DAT for bottom reinforcement of beam.
2. BEAMTOPB.DAT for top reinforcement
of beam.
These
are normal text files and can be opened in EDITPAD
for editing as explained in MI-FQ-01. The detail
structure of the data file is given in RCC DESIGN
REFERENCE MANUAL.
BD-FQ-05.
When do I select the option Design for BOTH (FRAME
+ GRID) during automatic beam design?
Answer
:This particular option appears
during Automatic Beam Design when the Building
Idealization is SPACE FRAME.
During
Beam Design there are there options available
for Space Frame Idealization namely :
1.
Grid Analysis Only
2. Frame Analysis Only
3. Both (Frame + Grid)
Grid
Analysis Only: The forces of Grid Analysis are
used during automatic beam design. This option
is to be used only if Space Frame Analysis option
is not done.
Frame
Analysis Only: The forces of Frame Analysis are
used during automatic beam design.
Both
(Frame + Grid): The forces of both (Frame as well
as Grid) Analysis are used during automatic beam
design. The Space Frame Analysis results are valid
only when the RCC work of all floors is complete,
because the distribution of moments between upper
and lower columns and floor beams is valid only
if upper columns are present. The construction
of building is done in stages and when only few
floors are cast the full frame action is not available.
To take this into account, a option is given to
design the beam for both the Frame Analysis and
Grid Analysis forces considered together. This
option will add one more combination during beam
design. The values of Midspan +ve moments in beams
will be more in Grid Analysis as compared to Frame
Analysis. The forces listed under the last combination
in Beam Design output will be of Grid Analysis.
BD-FQ-06
.
Can I consider redistribution of Support Moments?
Answer
:Due to the stiffness of columns, the Hogging
Moments in beams at column supports is usually
more than midspan Sagging Moments.
Over
the years this support moment reduces and the midspan
sagging moments increases. IS Code therefore allows
to re-distribute the negative moment at the supports
so that the beam is not under designed for sagging
moments at midspan Code allows a maximum value of
30% redistribution in case of Limit State Method
and 15% in case of Working Stress Method. Usually
15% Re-distribution value is used.
|
