D3.B.6 Design Parameters
Available design parameters to be used in conjunction with BS5400 are listed in table 2C.1. Depending on the value assigned to the
WET
parameter, you can determine the stage under consideration. For a composite design check, taking into consideration the construction stage, two separate analyses are required. In the first, member properties are non-composite and the WET parameter is set to 1.0 . In the second, member properties should be changed to composite and the WET
parameter set to 2.0. Member properties for composite or non-composite sections should be specified from user provided tables (refer to section 5.19 of the manual for specification of user tables). Rolled sections, composite or non-composite, come under WIDE FLANGE section-type and built-up sections under ISECTION. When specifying composite properties the first parameter is assigned a negative value and four additional parameters provided giving details of the concrete section. See user table examples provided. Note: Once a parameter is specified, its value
stays at that specified number until it is specified again. This is the way
STAAD.Pro works for all codes.
Parameter Name | Default Value | Description |
---|---|---|
ESTIFF | 0 |
Specify the criteria used for the design of compression members with moments.
|
KY | 1.0 | K value for bending about Y-axis. Usually this is minor axis. |
KZ | 1.0 | K value for bending about Z-axis. Usually this is major axis. |
LY | Member Length | Length to calculate slenderness ratio for bending about Y-axis, in current units of length. |
LZ | Member Length | Length to calculate slenderness ratio for bending about Z-axis, in current units of length. |
MAIN | 1.0 |
Grade of concrete:
|
NSF | 1.0 | Net section factor for tension members. |
PY | * |
Yield stress of steel. Set according to Design Strength of steel SGR |
RATIO | 1 | Permissible ratio of actual to allowable stresses. |
SBLT | 0.0 |
Steel
|
SGR | 0.0 |
Steel Grade per BS4360
|
TRACK | 1.0 |
Used to control the level of detail in the output
|
UNL | Member Length | Unsupported length for calculating allowable compressive bending stress, in current units of length. |
WET | 0.0 |
Used to specify the stage of construction.
|