The Rules of Thumb concrete design basics are something that every engineer should know to allow them to scheme concrete structures or if you need to do a quick assessment of a reinforced concrete design. This video does not just cover your basic rule of thumb using span to depth or height to depth ratios but also provides you with rules of sizing elements about the stresses, allowing you to have the most efficient concrete design.

span to depth ratios are not for transfer structures
Reinforced Concrete – one-way Slabs
• Simply Supported Span/25
• Continuous Span/30
• Cantilever Span/8
Reinforced Concrete – two-way Slabs
•Simply Supported Span/25
•Continuous Span/40

Post-tensioning – Residential Slabs
• Single Span Span/40
• Continuous Span/50
•Cantilever Span/15

Reinforced Concrete – Beams
•Single Span Span/13
•Continuous Span/15
•Cantilever Span/6

Post-tensioning – Beams
•Single Span Span/30
•Continuous Span/40
•Cantilever Span/15

Slabs and Beams - RC Rates
Reinforced Concrete Range 110 to 160 kg/m^3
Reinforced Concrete Beams 90 to 150 kg/m^3

Post tensioning Rates
Slabs PT 4.5 to 7.5 kg/m^2
Reo 35 to 75 kg/m^3
Banded PT 4.0 to 7.0 kg/m^2
Reo 35 to 60 kg/m^3

Columns
Reinforced Concrete
•Simply Supported Height/20
•continuous Height/26
•Cantilever Height/10

Walls
•Simply Supported Height/35
•Continuous Height/45
•Cantilever Height/18

Columns Rates
Reinforced Concrete
•1% 150 kg/m^3
•2% 250 kg/m^3
•3% 350 kg/m^3

Walls Rates
•Minimum 45kg/m^3
• Average 100kg/m^3
•Core walls 150kg/m^3 to 200kg/m^3

Stress Rule of Thumb
Moment Big K M/B*D^2
•Slabs ~ 3
•Beams ~5

Shear Stress = V/A
•Slab 0.4MPa
•Beam 0.2xfc Vu max

Column and Walls
Average Loading 10 kPa to 15kPa
•Column Stress 0.4 x fc
•Wall Stress 0.15 x fc - to avoid confinement

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Chapter
00:00 Intro
00:50 Span to Depth
02:20 Rates Slabs and Beams
03:57 Height to Depths
04:38 Rates Column and Walls
05:38 Moment and Shear
07:26 Know your Loads
09:13 Stress Limits

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