Building Construction Handbook, Eighth Edition

Steel fabricated beams can be used as an integral means of

support for precast concrete floors. These are an overall depth

and space saving alternative compared to down-stand reinforced

concrete beams or masonry walls. Only the lower steel flange of

the steel beam is exposed.

To attain sufficient strength, a supplementary steel plate is welded

to the bottom flange of standard UC sections. This produces a

type of compound or plated section that is supported by the main

structural frame.

Floor support

in-situ concrete filling steel mesh reinforced

structural topping

precast

concrete

floor units

standard UC, serial

sizes (mm):

fillet weld

100 mm

15 mm steel plate

welded to lower flange

152 × 152

203 × 203

254 × 254

305 × 305

356 × 368

356 × 406

Plated section

Precast Concrete Floors---Fabricated Beam