D6.A.5 Design 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, thus allowing the engineer to control the design process to suit an application's specific needs.
The default parameter values have been selected as 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|
Design code to follow. See TR.48.1 Parameter Specifications.
0.0 = design only for end moments and those at locations specified by SECTION command.
1.0 = calculate moments at tenth points long the beam, and use maximum Mz for design.
|C1||1.0||Parameter used in clause 5.21 in the calculation of M(D), the critical twisting moment and as shown in CM 66 Addendum 80, table 5, usual range from 0.71 to 4.10|
|C2||1.0||Parameter used in clause 5.21 in the calculation of M(D), the critical twisting moment and as shown in CM 66 Addendum 80, table 5, usual range from 0.0 to 1.56|
|DFF||None (Mandatory for deflection check)||"Deflection Length" divided by the Maximum allowable local deflection|
|DJ1||Start Jointof member||Joint No. denoting starting point for calculation of "Deflection Length" (See Note 1)|
|DJ2||End Joint of member||Joint No. denoting end point for calculation of "Deflection Length" (See Note 1)|
|DMAX||100.0 cm.||Maximum allowable depth (used in member selection).|
|DMIN||0.0 cm.||Minimum allowable depth (used in member selection).|
|FYLD||250.0 MPa||Yield strength of steel.|
|KY||1.0||K value for axial compression buckling about local Y-axis. Usually, this is the minor axis.|
|KZ||1.0||K value for axial compression buckling about local Z-axis. Usually, this is the major axis.|
|LY||Member Length||Length to calculate slenderness ratio about Y-axis for axial compression.|
|LZ||Member Length||Length to calculate slenderness ratio about Z-axis for axial compression.|
|NSF||1.0||Net section factor for tension members.|
|RATIO||1.0||Permissible ratio of actual load effect and design strength.|
|SAME||0.0||Controls the sections to try during a SELECT process.
0.0 = Suppress printing of all design strengths.
1.0 = Print all design strengths.
|UNF||1.0||Same as above provided as a fraction of member length.|
|UNL||Member Length||Unsupported length of compression flange for calculating moment resistance.|