what is the ratio of steel and concrete to use in slabs ,
beams, columns ?
Answer Posted / basel
Concrete building element
Weight of reinforcement in kg/m3
Bases 90-130
Beams 250-350
Capping beams 135
Columns 200-450
Ground beams 230-330
Footings 70-100
Pile Caps 110-150
Plate slabs 95-135
Rafts 115
Retaining walls 110-150
Ribbed floor slabs 80-120
Slabs – one way 75-125
Slabs – two way 67-135
Stairs 130-170
Tie beams 130-170
Transfer slabs 150
Walls – normal 70-100
Walls – wind 90-150
NOTE: For exposed elements add the following:
Beams +100%; Columns +15%; Walls +50%
Average values for typical concrete frames:
Heavy industrial = 130 kg/m3
Commercial = 100 kg/m3
Institutional = 90 kg/m3
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