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Cover Plated Beams. Used in renovation or restoration projects or to meet difficult depth limitations. Possible cover plate configurations. The additional steel adds to the plastic section modulus increasing the moment capacity Z x,add = 2Ay (for beams symmetric about PNA)

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cover plated beams
Cover Plated Beams

Used in renovation or restoration projects or to meet difficult depth limitations

possible cover plate configurations
Possible cover plate configurations
  • The additional steel adds to the plastic section modulus increasing the moment capacity
  • Zx,add = 2Ay (for beams symmetric about PNA)
  • A = cross sectional area of steel attached to one flange
  • y = distance from PNA to centroid of added steel
cover plate example p 49 notes
Cover Plate Example p. 49 notes

Design a cover plated alternative for the girder originally chosen for the office building design. A W24 x 117 was chosen to support the required load and meet the 24.5” depth limitation.

biaxial bending of beams
Biaxial Bending of Beams

Load causes bending about both principal (x and y) axes.

members under combined forces p 16 1 38
Members Under Combined Forces p. 16.1 – 38

If Pu = 0(no axial load)

Where,

H1-1b

If laterally supported

From beam charts 5-71 – 5-102 if not laterally supported

biaxial bending example p 46 notes
Biaxial Bending Example p. 46 notes

Roof trusses for a pitched industrial building roof are spaced 14.8 ft c.c. along the length of the building. The A36 steel purlins which carry the actual roofing must therefore span 14.8 m. The roof deck will provide lateral support to the top flange of the purlins. In-plane bracing will be provided in the roof, so as to shorten the weak axis span of the purlins. See the partial plan view of the roof. The following loads must be considered:

Snow & ice 20 psf

Roofing & sheathing 25 psf

Purlins & bracing 4 psf

Wind load 10 psf

slide7

4.4 ft

4.4 ft

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