FA-FQ-04
. How
do I consider Water Tank Load on the building?
Answer
: Water
Tank Load can be considered on columns at topmost
level for the Analysis and Design of building
structure as a whole. For this purpose the total
weight of tank including (RCC) Self Weight and
Water load shall be distributed in the Columns
supporting the Water Tank. This load shall be
applied as point loads on the topmost floor Beams
or Columns. These loads will be used in calculation
of Horizontal Earthquake loads as per IS 1893-198.
FA-FQ-05
. Can
I analyse a frame directly without drawing a plan?
Answer
: The
main program of BUILD-MASTER (BMaster.exe) is
for the Analysis, Design, Drawing and Estimation
for complete building as a whole in which the
plans of building are entered at every level and
program creates the Space Frame Model from these
plans.
A
separate Frame Analysis program (FrAnaly.exe) is
available to carry out the analysis of Plane/Space
Trusses, Plane/Space Frames and Grids. For this
the frame model shall be prepared by the user himself
and entered with Nodal Point Co-ordinates and Member
connectivity data. The program will do only the
analysis of structure and Plot the Loading. Bending
Moment, Shear Force and Deflection diagram in 2D/3D.
This diagram will be in DXF format which can be
taken in CAD.
FA-FQ-06.
How do I consider
column stiffness in Grid Analysis?
Answer
: In
Grid Analysis Parameters column stiffness shall
always be considered. For topmost level floor
"BOTTOM COLUMNS ONLY" and for other
floors "BOTH TOP & BOTTOM COLUMNS"
options shall be selected. "NEGELECT COLUMN
STIFFNESS" option is provided only if someone
wants to compare the grid analysis moment values
with those calculated manually using conventional
methods like Moment Distribution.
FA-FQ-07.
Can I omit Plinth
Beams in the Frame Model?
Answer
: Provision
of Plinth Beams in all buildings is highly recommended,
whether the walls are present at ground level
or not.
Plinth
Beams attract large moments due to frame action
irrespective of the presence of walls. Lesser the
heights of ground storey (stilt) more are the support
moments in the beams.
If
the walls are absent and upward pressure on the
beams is expected due to soil water table, extra
reinforcement at midspan top shall be provided.
(Program does not calculate this additional reinforcement).
FA-FQ-08.
Can I design a building
only for DL+LL and avoid Horizontal loads in Frame
Analysis ?
Answer
: If
the Space Frame option is selected in the Frame
Analysis Parameters of Frames menu , only then
a Space Frame (3D) model shall be created by the
Program. In the Load Combination option if Earthquake
and Wind load option is selected, then these forces
are considered in the Analysis.For small buildings
(G+2) only Grid Analysis can be done. For multistoried
buildings (upto G+6) Frame Analysis without Wind
or Earthquake can be done. But for the tall buildings
(more than G+6) it is advisable to carry out Frame
Analysis with Wind and Earthquake loads taken
into consideration.
FA-FQ-09.
Sometimes, the Moment
at the cantilever end in Cantilever Beams shown
in Bending Moment Diagram is a non-zero value.
Why?
Answer
: When
Torsion is considered while creating Grid Analysis
data File, some amount of Torsional moment will
be there, even at the Cantilever end of the Beam.
This value is plotted in the Bending Moment Diagram(
BMD ).
FA-FQ-10.
In case of Non-rectangular
Slabs, how is the distribution of Slab load ?
Answer
: In
case of Non-rectangular Slabs, the Slab Load is
distributed as Uniformly Distributed Load (UDL)
along the periphery of the Slab. The magnitude
of this Load is equal to (Total Slab Load) / (Perimeter
of Slab).
FA-FQ-11.
In Output Files,
the various values are factored or not ?
Answer
: In
Build-Master 2000, the Forces in various members
and Deflection values were unfactored. Same unfactored
values are plotted graphically in BMD, SFD, and
Deflection Diagrams also. Now, in Build-Master
2005, the Grid Analysis output values are still
unfactored. But Output values in the Space Frame
Analysis are factored( i.e. for each Load Combination,
the values are multiplied with appropriate Factors
and then these values are stored in Output File.
FA-FQ-12.
Do I need to refer
long Output File (.out) to see forces & moments
in Analysis ?
Answer
: The
important feature of Build-Master is that the
User is not required to refer to the huge output
file (.out) for viewing the forces. During the
Design of various members, the program creates
various files storing the Forces in members at
each level. The files created are as follows:
1
.BEM File for storing Forces and Moments in Beams
at that level.
2
.COL File for storing Forces in Columns at all levels
from bottom to top, for all Load Combinations.
3
.FOT for storing Forces and moments at the Bottom
most level.
FA-FQ-13.
In Grid Analysis
how can we release the end of secondary beam ?
Answer
: In
Build-Master, there is a provision of defining
Member End Modification Code, to change the support
condition for a beam. These Modification Codes
are - '0' for fixed member, '1' for left end hinged,
'2' for right end hinged and '3' for both ends
hinged. These changes can be made by selecting
Edit Data File option of Grid Analysis. Presently
these Modification Codes can be defined in Grid
Analysis only and not in the Frame Analysis.
FA-FQ-14.
If two long beams
are meeting at one point, one beam should act
as a cantilever and another beam should be resting
on this cantilever beam. Is it possible ?
Answer
: The
behaviour of the structure in general does not
depend on the Steel inside, as the Analysis method
used does not incorporate the contribution of
the reinforcement steel, during the Analysis.
The Redistribution and transfer of moments between
members and the joints depends only on the sizes
of adjacent beams, thickness of Slabs etc. and
not on the Steel in it. Therefore the Reinforcement
in RCC structures shall be provided as per the
Deflection and moment behaviour of the Structure
and one cannot assume the behaviour beforehand.
