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What you need today Text Notebook Calculator (optional) 1/8 = 1 print of foundation (basement) plan With dimensions

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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.

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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

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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

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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

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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.

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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

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Weight Calculations Example W-beam span and load table. (American Institute of Steel Construction)

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Typical Steel Beams

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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

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Weight Calculations Example Three supporting posts are added.

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