D1.A.4.1 AISC Steel Table
Almost all AISC steel shapes are available for input. Following are the descriptions of all the types of sections available:
Wide Flanges (W shapes)
All wide flange sections as listed in AISC are available the way they are written, e.g., W10X49, W21X50, etc.
20 TO 30 TA ST W10X49 33 36 TA ST W18X86
C, MC, S, M, HP Shapes
The above shapes are available as listed in AISC (9th Edition) without decimal points. For example, C8X11.5 will be input as C8X11 and S15X42.9 will be input as S15X42, omitting the fractional portion of the weight past the decimal.
10 TO 20 BY 2 TA ST C15X40 1 2 TA ST MC8X20
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.
21 22 24 TA D MC9X25 55 TO 60 TA D C8X18
Front to front channel steel sections can be defined by using the FR (Double Channel – Front to Front) option and any spacing required between the channels are specified with the SP designation.
61 62 TABLE FR C4X5 SP 0.5
Angle specifications in STAAD.Pro are different from those in the AISC manual. The following example illustrates angle specifications.
Similarly, L505010 = L 5 x 5 x 5/8 and L904016 = L 9 x 4 x 1
At present, there are two ways to define the local y and z-axes for an angle section. To make the transition from the AISC Manual to the program data easy, the standard section for an angle is specified:
51 52 53 TA ST L40356
This specification has the local z-axis (i.e., the minor axis) corresponding to the Z-Z axis specified in the steel tables. Many engineers are familiar with a convention used by some other programs in which the local y-axis is the minor axis. STAAD provides for this convention by accepting the command:
54 55 56 TA RA L40356
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.
14 TO 20 TA LD L35304 SP 0.5
Long leg back to back L3-1/2x3x1/4 with 0.5 space.
23 27 TA SD L904012
Short leg back to back L 9x4x3/4
Tees are not input by their actual names, as they are listed in the AISC manual, but instead by designating the beam shapes (W and S) from which they are cut. For example
1 2 5 8 TA T W8X24
Tee cut from W8x24, or a TW4x12.
Two types of specifications can be used for pipe sections. Pipe sections listed in the AISC manual can be specified as follows.
5 TO 10 TA ST PIPX20
Where the strength spec is one of the following:
- S = standard
- X = extra-strong
- D = double extra-strong
General pipe sections may be input by their outer and inner diameters. For example,
1 TO 9 TA ST PIPE 0D 2.0 ID 1.875
Indicates a pipe with an outer diameter of 2.0 and inner diameter of 1.875 in current input units.
Round hollow structural sections listed in the AISC manual can be specified as follows.
5 TO 10 HSS16X0.438 11 TO 12 HSS14X0.5_A1085
Indicates members 5 through 10 as 16" outer diameter and a nominal wall thickness of 7/16" (0.4375"). Members 11 and 12 have a 14" outer diameter and a 1/2" nominal wall thickness and use A1085 grade material.
- AISC codes require that the design of HSS sections use section properties calculated based on a reduced wall thickness. The STAAD.Pro database values incorporated a design thickness of 0.93× the nominal thickness.
- HSS sections using A1085 grade material per the AISC 360-16 and 360-10 codes are designed using section properties with the full nominal wall thickness. Thus, a separate set of tables is available to specify this material grade as these use different section properties.
Two types of specifications can be used for tube sections. Tube sections from the AISC tables can be specified as follows.
5 TO 10 TA ST TUB120808
General tube sections may be input by their dimensions (height, width, and thickness) as follows.
6 TA ST TUBE DT 8.0 WT 6.0 TH 0.5
Indicates a tube that has a height of 8, a width of 6, and a wall thickness of 0.5 in the current input units.
Rectangular hollow structural sections listed in the AISC manual can be specified as follows.
5 TO 10 HSST14X10X0.313 11 TO 12 HSST6X3X0.375_A1085
Indicates members 5 through 10 as a 14" x 10" tube with a nominal wall thickness of 5/16" (0.3125"). Members 11 and 12 are a 6" x 3" tube with a 3/8" nominal wall thickness and use A1085 grade material.