D14.B.4 Built-in Steel Section Library

A steel section library consisting of South African Standards shapes is available for member property specification.

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.

Refer to G.6.2 Built-In Steel Section Libraries for additional information.

D14.B.4.1 I Shapes

The following example illustrates the specification of I- shapes.

1 TO 15 TABLE ST IPE-AA100

D14.B.4.2 H shapes

Designation of H shapes in STAAD is as follows.

For example,

18 TO 20 TABLE ST 152X37UC

D14.B.4.3 PG shapes

Designation of PG shapes in STAAD is as follows.

100 TO 150 TABLE ST 720X200PG

D14.B.4.4 Channel Sections (C & MC shapes)

C and MC shapes are designated as shown in the following example.

3 TABLE ST 127X64X15C

D14.B.4.5 Double Channels

Back to back double channels, with or without spacing between them, are specified by preceding the section designation by the letter D. For example, a back to back double channel section PFC140X60 without spacing in between should be specified as:

100 TO 150 TABLE D PFC140X60

A back-to-back double channel section 140X60X16C with spacing 0.01 unit length in between should be specified as:

100 TO 150 TABLE D 140X60X16C  SP 0.01

Note: The specification SP after the section designation is used for providing the spacing. The spacing should always be provided in the current length unit.

D14.B.4.6 Angles

To specify angles, the letter L succeeds the angle name. Thus, a 70X70 angle with a 25mm thickness is designated as 70X70X8L. The following examples illustrate angle specifications.

100 TO 150 TABLE ST 70X70X8L

Note: This specification is for "standard" angles, designated by ST. In this specification, the local z-axis corresponds to the Y’-Y’ axis shown in the section table. Another common practice of specifying angles assumes the local y-axis to correspond to the Y’-Y’ axis. To specify angles in accordance with this convention, use the reverse angle designation, RA. Refer to G.4.2 Local Coordinate System for details on the local axis systems for standard (ST) and reverse (RA) angles.

Refer to the following example for details.

100 TO 150 TABLE RA 45X45X3L

D14.B.4.7 Double Angles

To specify double angles, the specification ST should be substituted with LD (for long leg back-to-back) or SD (short leg back-to-back). For equal angles, either SD or LD will serve the purpose. Spacing between angles may be provided by using the word SP followed by the value of spacing (in current length unit) after section designation.

100 TO 150 TABLE LD 50X50X3L
3 TABLE LD 40X40X5L SP 0.01

The second example above describes a double angle section consisting of 40X40X5 angles with a spacing of 0.01 length units.

D14.B.4.8 Tees

Tee sections obtained by cutting W sections may be specified by using the T specification instead of ST before the name of the W shape. For example:

100 TO 150 TABLE T IPE-AA180

will describe a T section cut from a IPE-AA180 section.

D14.B.4.9 Rectangular Hollow Sections

These sections may be specified in two possible ways. Those sections listed in the SAB tables may be specified as follows.

100 TO 150 TABLE ST TUB60X30X2.5

In addition, any tube section may be specified by using the DT(for depth), WT(for width), and TH(for thickness) specifications. For example:

100 TO 150 TABLE ST TUBE  TH 3 WT 100 DT 50

will describe a tube with a depth of 50mm, width of 100mm. and a wall thickness of 3mm. Note that the values of depth, width and thickness must be provided in current length unit.

D14.B.4.10 Circular Hollow Sections

Sections listed in the SAB tables may be provided as follows:

100 TO 150 TABLE ST PIP34X3.0CHS

In addition to sections listed in the SAB tables, circular hollow sections may be specified by using the OD (outside diameter) and ID (inside diameter) specifications.

For example:

100 TO 150 TABLE ST PIPE  OD 50 ID 48

will describe a pipe with an outside diameter of 50 length units and inside diameter of 48 length units. Note that the values of outside and inside diameters must be provided in terms of current length unit.

D14.B.4.11 Example

A sample input file to demonstrate usage of South African shapes:

STAAD PLANE
START JOB INFORMATION
ENGINEER DATE 30-Mar-05
END JOB INFORMATION
UNIT METER KN
JOINT COORDINATES
1 0 0 0; 2 9 0 0; 3 0 6 0; 4 3 6 0; 5 6  6 0; 6 9 6 0; 7 0 10.5 0;
8 9 10.5 0; 9 2.25 10.5 0; 10 6.75 10.5  0; 11 4.5 10.5 0; 12 1.5 11.4 0; 
13 7.5 11.4 0; 14 3 12.3 0; 15 6 12.3 0; 16 4.5 13.2 0;
MEMBER INCIDENCES
1 1 3; 2 3 7; 3 2 6; 4 6 8; 5 3 4; 6 4  5; 7 5 6; 8 7 12; 9 12 14;
10 14 16; 11 15 16; 12 13 15; 13 8 13; 14 9 12; 15 9 14; 16 11 14;
17 11 15; 18 10 15; 19 10 13; 20 7 9; 21  9 11; 22 10 11; 23 8 10;
MEMBER PROPERTY SAFRICAN
1 TABLE ST IPE-AA100
2 TABLE T IPE120
3 TABLE ST 152X23UC
4 TABLE T 152X23UC
5 TABLE ST 812X200PG
6 TABLE T 812X200PG
7 TABLE ST 178X54X15C
8 TABLE D 178X54X15C
9 TABLE D 178X54X15C SP 0.1
10 TABLE ST 25X25X5L
11 TABLE RA 25X25X5L
12 TABLE LD 25X25X5L
13 TABLE SD 25X25X5L
14 TABLE LD 25X25X5L SP 0.1
15 TABLE SD 25X25X5L SP 0.1
16 TABLE ST TUB40X2.5SHS
17 TABLE ST TUBE TH 0 WT 0 DT 50
18 TABLE ST TUBE TH 0.02 WT 100 DT 50
20 TABLE ST PIP48X2.0CHS
21 TABLE ST PIPE OD 0.5 ID 0.48
PRINT MEMBER PROPERTIES
FINISH