STATUS: DRAFT Change 20170328: W has trailing constraints, nothing means straight flange ends, 1 means one radius at end of flange and 2 means two at end of flange.

This standard defines a universal way to describe a shapes.

Summary

This standard describes a way to specify basic shapes of sections, together with their dimensions.

A code is a concatenation of data blocks:

<Shape block>[Details block][Units block]<Geometry block>

• Shape block: This is one character for the main shape
  • Abbreviations: H Hexagonal, C Circular, S Square, R Rectangular or...
  • Letters of letter shapes sections: I, U, L, T, O, Z (O is omega shape). Example: R for rectangular massive flat bars.
• Details block: Zero or more characters with constraints of the shape. They are only added if required. Order is alphabetical.
  • E: Equal width and height and or equal legs. Examples: ZE for a Z profile with equal legs or TE for a T with equal width and height.
  • H: Hollow sections. Examples: SH for for a square hollow with sharp edges and CH for a circular hollow, pipe.
  • F: Flanges extra. Example: UF for a C like profile.
  • R: Round edges. Examples: SR for a square bar with rounded edges or SHR for a square hollow with rounded edges, square tube.
  • S: Flange has a slope: Example: IWS for an I profile with flanges with a slope.
  • W(n): Wall endings diverge. Diverging thickness, width of one or more wall endings (i.e. are not parallel, ending in radius), typical for warm rolled products. If flanges end not straight a value between brackets is added: (1) for one radius, (2) for two radii. Examples: IW for an I profile with radii between flanges and web but with sharp flange endings, LW(1) for a L profile with each leg ending containing one rounding, LW(2) similar but with each leg ending containing one rounding on each side of the flange ending.
  • X or Y: Section is cut over x- or y-axis. Example: IW cut over longitude becomes IWX.
• Units block: omitted or one character, no character means metric in mm and "I" means imperial in inches.
• Geometry block: All dimensions needed to constrain a section
  • The logical order is: First width and height, then thickness in same order, radii and angles.
  • Angles can be degrees or ratios like "7/50".
  • Dimensions are nominal.
  • See the table with drawings, where dimensions have an order number.
  • The list separator is an asterisk "*"

The following table shows the implementation of what is above.

Intend

The intend is to offer a way to classify industry standard profiles, not limited to steel, based on shape only.

The reasons for using this standard can be:

• Shapes are described not depending on manufacturing characteristics such as "warm rolling".
• Shapes are described not depending on function characteristics such as "beam".
• Shapes are described not depending on material characteristics such as "steel".
• The names are better suited for use in automation applications.
• Naming is based on visible appearance like "Square" and "Rounded", seeking a compromise between habitual naming, being practical and being complete enough to achieve global coverage.
• By defining a shape, followed by parameters for geometry, a global unique designation is created.

Naming

A shape is defined by a concatenated string, consisting of two parts:

• Shape defining parameters like R for Rectangular bar.
• Geometry defining parameters 30*5 for width and height in mm.

Following this example, the designation is:

R30*5

String of shape defining parameters

The name is one or a combination of characters.

• The first character is the main shape. Examples: "T-profile" and "Rectangular"
• Subsequent characters are only designated if not corresponding to the expected default shape and or add extra shape complexity. This works like a sieve. The longer the code, the more complexity.

First character, main shape

The first character determines the basic shape.

The first row contains abbreviations:

The second row is more obvious, the letter represents the shape. O stands for omega.

Following characters, additional shape characteristics

The sieve consist of characteristics that are additional to the main shape. So what is standard, what is expected is not specified. Deviations are marked with a character. From top to bottom:

String of geometry defining parameters

Orientation

Shapes are positioned as illustrated. The series H, C, S and R as drawn. The letter series as written. So a H-beam (like HEB) is a variant of the family of I-shapes and is drawn as an I.