D4.E.7Design Parameters
The design parameters outlined in the following table may be used to control the design procedure. These parameters communicate design decisions from the engineer to the program and thus allow the engineer to control the design process to suit an application's specific needs.
The default parameter values have been selected such that they are frequently used numbers for conventional design. Depending on the particular design requirements, some or all of these parameter values may be changed to exactly model the physical structure.
Parameter Name | Default Value | Description |
---|---|---|
CODE | CODE CANADIAN | Used to designate this code (default is the
2019 edition):
Design code to follow. See TR.48.1 Parameter Specifications. |
BEAM | 1.0 |
Used to specify locations along member length considered for design:
|
CAN
(S16-19 only) |
0 |
This parameter is applicable for doubly symmetric I-shaped cantilever member as per CL 13.6 (h) subjected to transverse load only.
Notes:
|
CB | 0.0 | Value of ω2 (code Cl 13.6) to be used for calculations. ω2 is calculated internally if CB is 0.0 or not provided. |
CMY | ω1 calculated as per clause number 13.8.5 (a) |
ω1
in local Y direction for the member. The
program calculated value of ω1
depends
on whether the member is subjected to any transverse load or not:
STAAD.Pro will calculate ω1 based on the formula specified in 13.8.5 (a) unless you directly specify a value. You may specify any value between 0.4 to 1 for ω1 . |
CMZ | ω1 calculated as per clause number 13.8.5 (a) |
ω1
in local Z direction for the member. The
program calculated value of ω1
depends
on whether the member is subjected to any transverse load or not:
STAAD.Pro will calculate ω1 based on the formula specified in 13.8.5 (a) unless you directly specify a value. You may specify any value between 0.4 to 1 for ω1 . |
CPSACING | 0.0 | Spacing between connectors of built-up members required for slenderness ratio calculation per Cl. 19.1.4. |
DFF | None (Mandatory for deflection check) |
Deflection Length/Maxmimum Allowable local deflection. See TR.40 Load Envelope for deflection checks using serviceability load envelopes. |
DJ1 | Start Joint of member | Joint No. denoting start point for calculation
of Deflection Length(see D1.B.1.2 Design Parameters) |
DJ2 | End Joint of member | Joint No. denoting end point for calculation of
Deflection Length(see D1.B.1.2 Design Parameters) |
DMAX | 45.0 in. | Maximum allowable depth (Applicable for member selection) |
DMIN | 0.0 in. | Minimum required depth (Applicable for member selection) |
FLX | 0 |
Parameter for specifying the flexural-torsional restraint condition.
|
FU | 345.0 MPa | Ultimate strength of steel. |
FYLD | 300.0 MPa | Yield strength of steel. |
IMM
(S16-19 only) |
0 |
Truss Type as required for CL 13.3.2.2 and CL 13.3.2.3 as per CSA S16-19
|
KT | 1.0 | K value for flexural torsional buckling. |
KY | 1.0 | K value for general column flexural buckling about the local Y-axis. Used to calculate slenderness ratio. |
KZ | 1.0 | K value for general column flexural buckling about the local Z-axis. Used to calculate slenderness ratio. |
LAT | 0 |
Specify lateral support conditions:
|
LEG | 0 |
This parameter is meant for plain angles (clause 13.3.3.2).
|
LHT
(S16-19 only) |
0 |
Load Height Position as required to check as per CL 13.6.(h)
Note: The
LHT parameter should be used along with the
CAN parameter. |
LT | Member Length | Length for flexural torsional buckling. |
LY | Member Length | Length for general column flexural buckling about the local Y-axis. Used to calculate slenderness ratio. |
LZ | Member Length | Length for general column flexural buckling about the local Z-axis. Used to calculate slenderness ratio. |
MAIN | 200 | Allowable slenderness limit for compression members. A value of 1 suppresses this check. Any value greater than 1 is used as the compression slenderness check value. A value of zero (0) uses the default (i.e., slenderness limit of 200). |
NCR | 0 | This parameter sets the n
factor to calculate Cr value as per clause number 13.3.1
Notes:
|
NSF | 1.0 | Net section factor for tension members. |
PROFILE | - | Used in member selection. Refer to TR.48.1 Parameter Specifications for details. |
RATIO | 1.0 | Permissible ratio of actual load effect to the design strength. |
SLF | 1.0 | The shear lag factor, U, normally taken
from Cl. 12.3.3.2, combined with the NSF parameter to
determine the rupture strength. |
SNUG | 1 |
Specify type of connection for the built-up members (Refer to Cl. 19.1.4):
|
SSY | 0 |
|
SSZ | 0 |
|
STIFF | Member length of depth of beam, whichever is lesser. | Spacing of traverse stiffeners. |
STP | 1 |
|
TMAIN | 300 | Allowable slenderness limit for tension members. A value of 1 suppresses this check. Any value greater than 1 is used as the tension slenderness check value. A value of zero (0) uses the default (i.e., slenderness limit of 300). |
TRACK | 0.0 |
Design output:
|
UNB | Member Length | Unsupported length in bending compression of the bottom flange for calculating moment resistance. |
UNT | Member Length | Unsupported length in bending compression of the top flange for calculating moment resistance. |