D10.B.11 Design Parameters
Design per Mexican Standards is requested by using the CODE. Other applicable parameters are summarized in Table 13B.1 below. 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.
The parameters DMAX and DMIN may only be used for member selection only.
| Parameter Name | Default Value | Description |
|---|---|---|
| CODE | - |
Must be specified as MEXICAN. Design code to follow. See TR.48.1 Parameter Specifications. |
| BEAM | 0 |
0: Design at ends and those locations specified by SECTION command. 1: Design at ends and at every y cada 1/12th point along member length |
| CB | 1 | Coefficient C defined per section 3.3.2.2. If Cb is set to 0.0 it will be calculated by the program according to LRFD USA (CbMex=1/CbUSA). Any other value will be directly used in the design. |
| CMB | 1 |
Cfactor for combined forces when there are transverse loads in the members. Section 3.4.3.3.ii of NTC
|
| DFF | None(Mandatory for deflection check, TRACK 4.0) |
"Deflection Length" / Maxm. allowable local deflection See Note 1 below. |
| DJ1 | Start Jointof member |
Joint No. denoting starting point for calculation of "Deflection Length ." See Note 1 below. |
| DJ2 | End Joint of member |
Joint No. denoting end point for calculation of "Deflection Length." See Note 1 below. |
| DMAX | 114 cm | Maximum allowable depth |
| DMIN | 0.0 cm | Minimum allowable depth |
| DSD | T |
Perform the ductile seismic design in accordance with Section 11 (True or False). Main design conditions are considered (not including, at the moment, geometric ones) |
| FU | 4,230 Kg/cm2 | Ultimate tensile strength of steel |
| FYLD | 2,530 kg/cm2 | Minimum Yield strength of steel |
| IMM | 0 |
Main or secondary member for the purpose of checking slenderness
|
| INO | 0 |
Curve Definition according to NTC.3.2.2.1a, defined for I shapes or tubes
|
| IRR | 0 |
Variable defined for the whole structure indicating if it is regular or irregular according to section 3.4 of the NTC.
|
| KX | 1.0 | Effective length factor for flexural-torsional buckling |
| KY | 1.0 | Effective length factor for local Y axis- Usually minor axis |
| KZ | 1.0 | Effective length factor for local Z axis- Usually major axis |
| LDR | T | Defines if the structure has elements to bear the wind load (shear walls, wind trusses, or bracing rigid elements ) that restrict lateral displacements and allow to disregard slenderness effects. (True or False) |
| LX | Member length | Length for determining flexural-torsional buckling |
| LY | Member length | Length to calculate slenderness ratio for buckling about local Y axis. |
| LZ | Member length | Length to calculate slenderness ratio for buckling about local Z axis. |
| NSF | 1 | Net section factor for tension members |
| RATIO | 1.0 | Permissible ratio of actual load effect and design strength |
| STIFF | Longer of Member length or depth | Spacing of stiffeners for beams for shear design |
| TRACK | 0 |
Controls the level of detail in output
|
| UNB | Member length |
Unsupported length (L) of the bottom* flange for calculating flexural strength . Will be used only if compression is in the bottom flange. See Note 2 below. |
| UNT | Member length |
Unsupported length (L) of the top* flange for calculating flexural strength . Will be used only if compression is in the top flange. See Note 2 below. |
D10.B.11.1 Notes
- For deflection check, parameters DFF, DJ1, and DJ2 from D3.B.6 Design Parameters may be used. All requirements remain the same.
- Top and Bottom represent the positive and negative side of the local Y axis (local Z axis if SET Z UP is used).