By C. H. Goodchild, British Cement Association, Reinforced Concrete Council
Read Online or Download Economic concrete frame elements: a pre-scheme design handbook for the rapid sizing and selecton of reinforced concrete frame elements in multi-storey buildings PDF
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Additional resources for Economic concrete frame elements: a pre-scheme design handbook for the rapid sizing and selecton of reinforced concrete frame elements in multi-storey buildings
Example text
Perimeter 400 x 350 500 x 400 Corner 350 sq. 400 sq. 600 sq. 600 x 450 450 sq. 700 sq. 700 x 500 500 sq. 800 sq. 800 x 550 550 sq. 900 sq. 1000 sq. 1100 sq. 1200 sq. 900 x 600 1000 x 650 1100 x 700 1200 x 750 600 sq. 650 sq. 700 sq. 750 sq. 0 kN/m2 abf abf abf bf bf bfg bfg LINKS, MAXIMUM NUMBER OF PERIMETERS (and percentage by weight of reinforcement), no. 5 41 Flat slabs with edge beams Introducing edge beams to flat slabs overcomes many of the problems associated with shear at perimeter columns and edge deflection.
Refer to column charts and data to estimate sizes, etc. DIMENSIONS Square panels, minimum of two spans x two bays. Ribs 125 mm wide @900 mm cc. Topping 100 mm. Moulds variable depth. Internal beam two waffles wide; edge beam one waffle wide, ie. rib/solid intersection at 900 + 125/2 from centreline of support. REINFORCEMENT Max. bar sizes, ribs: 2T25B, 2T20T (in top of web) and R8 links; beams: T32 T & B, T8 links. 12%) in topping. 10% allowed for wastage, etc. 50 kN/m2 (finishes) and perimeter load of 10 kN/m (cladding) included.
Loads are applicable as a udl over 75% of the beam’s length. Self weight used accounts for 5:1 slope to ribs and solid edges as described above. CONCRETE C35, 24 kN/m3, 20 mm aggregate. FIRE & DURABILITY Fire resistance 1 hour; mild exposure. DESIGN Design based on corner panels. Single span (both ways) assumes torsional restraint. 6 270 296 322 350 396 444 496 314 344 388 412 450 502 566 270 302 338 376 430 520 660 276 308 342 382 436 528 670 Use an equivalent square span, below, to derive thickness.