thumbrules for sizing members
DESCRIPTION
sizing RCC elementsTRANSCRIPT
Preliminary Sizing of Concrete BeamsMember Span/Depth Ratio Max. Recommended Span
Rectangular Beam 10 to 14 (cont. 20 to 26) 8m (cont. 12m)
Flanged Beam 12 to 18 (cont. 18 to 21) 10m (cont. 14m)
Cantilever 2 to 6 5m
Band Beams 18 to 20 12m
The maximum spans listed here are not absolute limits. Longer spans are possible with every type, but
may not be economical. As a rule of thumb for estimates of thickness above the span on deflection ratio’s
should be multiplied by “maximum recommended span”/”actual span”)
The higher number are given for light loadings (about 1.5 kpa) and the lower numbers for heavy loadings
(about 10kpa)
*2010 Design Tips by Rowing Engineer
Preliminary Sizing of Concrete SlabsMember Span/Depth Ratio Max. Recommended Span
One-way Simply Supported 20 to 30 6m
One-way Continuous 28 to 34 7m
Two-way Simply Supported 24 to 34 6.5m
Two-way Countinuous 30 to 34 7.5m
Cantilever 6 to 11 3m
Flat Slab 23 to 28 7m
The maximum spans listed here are not absolute limits. Longer spans are possible with every type, but
may not be economical. As a rule of thumb for estimates of thickness above the span on deflection ratio’s
should be multiplied by “maximum recommended span”/”actual span”)
The higher number are given for light loadings (about 1.5 kpa) and the lower numbers for heavy loadings
(about 10kpa)
*2010 Design Tips by Rowing Engineer
Preliminary Sizing of Steel MembersElement Span/depth ratio Maximum span
Purlins 32 12m
http://gmconsult.wikidot.com/technical
Roof beams (light dead loading) 18-30 6-30m
Floor I beams and joists 18 18m
Floor Plate girder 41194 25m (80’)
Floor Joist (steel only) 17 6-9m (20-30’)
Castellated UB’s* 14-17 12-20m(40-70’)
Transfer beams 10 6-30m
Trusses supporting floors 10 6-30m
Roof trusses (pitch>20) 14-15 17m (55’)
Space Frames 15-30 100m (300’)
Primary beams (supported by columns) 41197 12m (40’)
Secondary beams (supported by other beams) 15-25 10m (33’)
Portal frame leg 35-40 60m (200’)
Simple span rafter 24 30m (100’)
Simple span roof beam 15 25m (80’)
Con’t beam or joist .85 * simple span value
Column SHS H/D 20-35 2-8m
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page revision: 12, last edited: 9 Aug 2012, 15:06 (533 days ago)
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24-Jan-14http://gmconsult.wikidot.com/technical