D3.B.4 Built-In Steel Section Library
The following information is provided for use when the built-in steel tables are to be referenced for member property specification. These properties are stored in a database file. If called for, the properties are also used for member design. Since the shear areas are built into these tables, shear deformation is always considered during the analysis of these members.
Almost all BSI steel sections are available for input. A complete listing of the sections available in the built-in steel section library may be obtained by using the tools of the graphical user interface.
Following are the descriptions of different types of sections available:
Refer to G.6.2 Built-In Steel Section Libraries for additional information.
D3.B.4.1 Universal Beams, Columns, and Piles
All rolled universal beams, columns and pile sections are available. The following examples illustrate the designation scheme.
20 TO 30 TA ST UB305X165X54 33 36 TA ST UC356X406X287 100 102 106 TA ST UP305X305X186
D3.B.4.2 Rolled Steel Joists
Joist sections may be specified as they are listed in BSI-80 with the weight omitted. In those cases where two joists have the same specifications but different weights, the lighter section should be specified with an "A" at the end.
10 TO 20 TA ST JO152X127 1 2 TA ST JO127X114A
All rolled steel channel sections from the BSI table have been incorporated in STAAD. The designation is similar to that of the joists. The same designation scheme as in BSI tables may be used with the weight omitted.
10 TO 15 TA ST CH305X102 55 57 59 61 TA ST CH178X76
D3.B.4.4 Double Channels
Back-to-back double channels, with or without spacing between them, are available. The letter "D" in front of the section name will specify a double channel (e.g., D CH102X51, D CH203X89, etc.)
51 52 53 TA D CH152X89 70 TO 80 TA D CH305X102 SP 5.
(specifies a double channel with a spacing of 5 length units)
D3.B.4.5 Tee Sections
Tee sections are not input by their actual designations, but instead by referring to the universal beam shapes from which they are cut. For example,
54 55 56 TA T UB254X102X22
(tee cut from UB254X102X22)
All equal and unequal angles are available for analysis.Note, however, that only angles specified with an RA specification can be designed.
The standard angle section is specified as follows:
15 20 25 TA ST UA200X150X18
35 TO 45 TA RA UA200X150X18
D3.B.4.7 Double Angles
Short leg back-to-back or long leg back-to-back double angles can be specified by inputting the word SD or LD, respectively, in front of the angle size. In case of an equal angle, either LD or SD will serve the purpose. For example,
14 TO 20 TA LD UA200X200X16 SP 1.5 23 27 TA SD UA80X60X6
"SP" denotes spacing between the individual angle sections.
D3.B.4.8 Pipes (Circular Hollow Sections)
To designate circular hollow sections from BSI tables, use PIP followed by the numerical value of diameter and thickness of the section in mm omitting the decimal section of the value provided for diameter. The following example will illustrate the designation.
10 15 TA ST PIP213.2
(specifies a 21.3 mm dia. pipe with 3.2 mm wall thickness)
Circular hollow sections may also be provided by specifying the outside and inside diameters of the section. For example,
1 TO 9 TA ST PIPE OD 25.0 ID 20.0
(specifies a pipe with outside dia. of 25 and inside dia. of 20 in current length units)
Only code checking and no member selection will be performed if this type of specification is used.
D3.B.4.9 Rectangular or Square Hollow Sections (Tubes)
Designation of tubes from the BSI steel table is illustrated below:
BSI tube nomenclature
15 TO 25 TA ST TUB160808.0
Tubes, like pipes, can also be input by their dimensions (Height, Width and Thickness) and not by any table designations.
6 TA ST TUBE DT 8.0 WT 6.0 TH 0.5 (a tube that has a height of 8, a width of 6, and a wall thickness of 0.5 length units)