What you need today Text Notebook Calculator (optional) 1/8 = 1
print of foundation (basement) plan With dimensions
Slide 3
Calculating Building Loads pages 173-177
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Types of structure loads Live loads loads that move or change
furniture, appliance, people, wind, snow, etc. Dead loads loads
that are constant The weight of the structure construction
materials & plumbing fixtures, etc.
Slide 5
Beams and Girders Beams or girders support floor joists over
long spans. May be wood or metal. Wood beams may be built-up or
solid. (p.291) Two types of steel beams Standard or Wide Beam size
based upon weight of the structure and the span.
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Typical Steel Beams
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Loads on the beam 1/2 of the buildings weight rests on the beam
1/2 of the buildings weight rests on the foundation walls
Slide 8
Weight Supported by Beam
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Values for residential buildings 1st floor live load + dead
load = 50 lbs/ft 2 2nd floor live load + dead load = 50 lbs/ft 2
Ceiling live load + dead load = 30 lbs/ft 2 Walls dead load = 10
lbs/ft 2 Roof has no load on the beam
Slide 10
Heres what you need Calcualtor NOTEBOOK! Copy of floor plan or
foundation plan Architects Scale Determine where your beam(s) will
go
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Lets Begin!
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A) AREA = L x W = xxxx sq. ft. B) Floor sq. ft. x 50 lbs./ft =
? C) Ceiling sq. ft. x 30 lbs./ft = ? D)Subtotal C + B = ? E) total
D 2 = ? F) Wall weight length x 8 x 10 lbs./ft. = ? G) Weight on
Beam F + E = ? How much weight does your beam need to support? Time
to do the math...
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Now what? Convert to Kips Refer to tables S-Beam or W-Beam
Determine size & spacing of posts Refer to your textbook pp.
175-177
Slide 14
Load Assumptions First Floor and Second Floor Live + dead load
= 50 pounds per square foot. Ceiling Live + dead load = 30 pounds
per square foot. Walls Dead load = 10 pounds per square foot. Roof
No load on beam.
Slide 15
Weight Calculations Example Two Story Frame Structure 28' x
40'. Area of the House 1120 square feet per floor. Wall Area 320
square foot per wall. Assumes a bearing wall on each floor.bearing
wall
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Weight Calculations Example Foundation of the house.
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Weight Calculations Example Weight of first floor = 56,000 lbs.
Weight of second floor = 56,000 lbs. Weight of ceiling = 33,600
lbs. Total weight = 145,600 lbs. Half bears on the beam = 72,800
lbs. First and second floor wall weight total = 6,400 lbs. Weight
bearing on the beam = 79,200 lbs.
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Beam capacity tables S-Beam (p.249) standard I-beam W-Beam
(p.249) wide flange I beam Wood beams Microllam
Slide 19
Weight Calculations Example W-beam span and load table.
(American Institute of Steel Construction)
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Typical Steel Beams
Slide 21
Weight Calculations Example Length of beam = 40 feet. Three
columns reduce span to 10'-0" and 19.8 kips(1 kip = 1000
pounds).kip An 8" x 6 1/2" WF beam will support 23 kips, but an 8 x
4 SF beam will also work and is cheaper
Slide 22
Weight Calculations Example Three supporting posts are
added.