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Rules-of-thumb for Beams and Columns
Class Instructor :
RINO D.A. FERNANDEZ
SIZE TOTAL TRIBUTARY AREA
200 x 200mm 150 sq.m.
300 x 300mm 300 sq.m.
400 x 400mm 450 sq.m.
500 x 500mm 600 sq.m.
700 x 700mm 900 sq.m.
900 x 900mm 2,000 sq.m.
SITECAST CONCRETE COLUMNS:
DEPTH WIDTH SPAN
15” (400mm) 5” (120mm) 6.00 meters
30” (750mm) 10” (250mm) 12.00 m
45” (1150mm) 15” (400mm) 18.00 m
60” (1500mm) 20” (500mm) 24.00 m
SITECAST CONCRETE BEAMS:
SIZE TOTAL TRIBUTARY AREA
200 x 200mm 150 sq.m.
300 x 300mm 300 sq.m.
400 x 400mm 450 sq.m.
500 x 500mm 600 sq.m.
700 x 700mm 900 sq.m.
900 x 900mm 2,000 sq.m.
PRECAST CONCRETE COLUMNS:
DEPTH WIDTH SPAN
12” (300mm) 8” (200mm) 6.00 meters
24” (600mm) 8” (200mm) 11.00 m
30” (750mm) 10” (250mm) 14.00 m
36” (900mm) 12” (300mm) 16.00 m
48” (1200mm) 16” (400mm) 20.00 m
PRECAST CONCRETE BEAMS:
DEPTH WIDTH SPAN
15” (400mm) 8” (200mm) 10.00 meters
30” (750mm) 10” (250mm) 18.00 m
45” (1150mm) 15” (400mm) 28.00 m
60” (1500mm) 20” (500mm) 36.00 m
POSTTENSIONED CONCRETE BEAMS:
SIZE TOTAL TRIBUTARY AREA (max)
150 x 150mm 50 sq.m. (Residential only)
200 x 200mm 100 sq.m.
250 x 250mm 180 sq.m.
300 x 300mm 280 sq.m.
350 x 350mm 380 sq.m.
400 x 400mm 450 sq.m.
WOOD COLUMNS:
COLUMN ANCHORAGE:
COLUMN ANCHORAGE:
DEPTH WIDTH SPAN
6” (150mm) 10” (250mm) 2.40 meters
8” (200mm) 3.50 m
10” (250mm) 5.00 m
12” (300mm) 6.00 m
14” (350mm) 7.30 m
16” (400mm) 8.50 m
18” (450mm) 9.80 m
20” (500mm) 9.80 m
24” (600mm) 9.80 m
WOOD BEAMS:
COLUMN & BEAM CONNECTION:
COLUMN & BEAM CONNECTION:
DEPTH WIDTH SPAN
6” (150mm) 10” (250mm) 3.00 meters
8” (200mm) 4.00 m
10” (250mm) 5.00 m
12” (300mm) 6.00 m
14” (350mm) 7.00 m
16” (400mm) 8.00 m
18” (450mm) 9.00 m
20” (500mm) 10.00 m
24” (600mm) 13.00 m
GLUE LAMINATED BEAMS:
DEPTH WIDTH SPAN
30” (750mm) 10” (250mm) 16.00 meters
36” (900mm) 20.00 m
42” (1050mm) 24.00 m
48” (1200mm) 28.00 m
GLUE LAMINATED BEAMS:
DEPTH SPAN
24” (600mm) 16.00 meters
48” (1200mm) 30.00 m
72” (1800mm) -
96” (2400mm) -
STEEL OPEN-WEB JOISTS:
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