Special Section - with a Corrugated Web

Sections with a corrugated web are I-sections with thin-walled, corrugated webs. They are sections from the SIN section family, or with user-defined dimensions.

Members with a corrugated web can be designed only in accordance with the Polish steel code.

The following parameters specify a section with a corrugated web:

• Label - Assigns a label (name) to a section. (Robot assigns automatically a standard label for the section, such as, WTB 1000 - 300 x 15.)
• Color - Specifies a color for the section.
• Specify a section:

  - From the database:standard sections with identical flanges (b ₁ =b ₂ , t _f1 = t _f2 ) and the following symbols of the web thickness:

  • A - 2 mm (standard section label: WTA ...)
  • B - 2.5mm (standard section label: WTB ...)
  • C - 3 mm (standard section label: WTC ...)

  All dimensions are those of the SIN section family; therefore, the fields for defining the dimensions are unavailable.

  - With user-defined values:

  

  • S (Standard section label: WTS ...)
  • t _w - Web thickness
  • h - Web height
  • b ₁ - Width of the upper flange
  • t _f1 - Thickness of the upper flange
  • b ₂ - Width of the lower flange
  • t _f2 - Thickness of the lower flange
  • moreover, in the calculation of section properties the following variables are used:
  • f - Wave amplitude
  • m - Projected length of a wave
  • s - Developed length of a wave
• Section type - Set of options for selecting an appropriate section type.
• Gamma angle - Specifies the gamma angle of a section.

Geometrical properties

Total section height: H = h + t _f1 + t _f2

Cross-sectional area of flanges

Af = b1 * tf1 + b2 * tf2

Cross-sectional area of a web

Aw = h * tw

Total section area

A = Af + Aw

Cross-sectional areas effective for shear

Ay = b1 * tf1 + b2 * tf2 - Cross-sectional area of flanges

Az = Aw * m / s - Reduced cross-sectional area of the web

Properties calculated without considering the web

Static moment

S = b1 * tf1 * (h + tf2 + tf1 / 2) + b2 * tf2 * tf2 / 2

Position of the section centroid

Moments of inertia about Y and Z axes, respectively, of a section made only of flanges

Torsional moment of inertia

Self-weight

G= Gf +Gw

G _f = r _s * A _f * l

Gw = r _s * Aw * lw = r * Aw * l/m * s

where:

A _f - Cross-sectional area of flanges

A _w - Cross-sectional area of the web

r _s - Unit weight of steel

l - Member length

Iw - Developed length of the web plate: lw = l / m * s

m - Projected length of a wave

s - Developed length of a wave.