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)
Used in renovation or restoration projects or to meet difficult depth limitations
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.
Load causes bending about both principal (x and y) axes.
If Pu = 0(no axial load)
If laterally supported
From beam charts 5-71 – 5-102 if not laterally supported
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