What you need today

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# What you need today - PowerPoint PPT Presentation

What you need today. Text Notebook Calculator (optional) 1/8” = 1’ print of foundation (basement) plan With dimensions. Calculating Building Loads. pages 173-177. Types of structure loads. Live loads loads that move or change furniture, appliance, people, wind, snow, etc. Dead loads

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

pages 173-177

• loads that move or change
• furniture, appliance, people, wind, snow, etc.
• The weight of the structure
• construction materials & plumbing fixtures, etc.
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.
• 1/2 of the building’s weight rests on the beam
• 1/2 of the building’s weight rests on the foundation walls
Values for residential buildings
• 1st floor
• 2nd floor
• Ceiling
• Walls
• Roof has no load on the beam
Here’s what you need
• Calcualtor
• NOTEBOOK!
• Copy of floor plan or foundation plan
• Architect’s Scale
• Determine where your beam(s) will go

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) ½ total D 2 = ?

F) Wall weight length x 8’ x 10 lbs./ft. = ?

G) Weight on Beam F + E = ?

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
• First Floor and Second Floor
• Ceiling
• Walls
• Roof
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.
Weight Calculations Example
• Foundation of the house.
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.
Beam capacity tables
• S-Beam (p.249)
• standard I-beam
• W-Beam (p.249)
• wide flange I beam
• Wood beams
• Microllam®
Weight Calculations Example
• W-beam span and load table.

(American Institute of Steel Construction)

Weight Calculations Example
• Length of beam = 40 feet.
• Three columns reduce span to 10'-0" and 19.8 kips(1kip = 1000 pounds).
• 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
Weight Calculations Example
• Three supporting posts are added.
Weight Calculations Example
• Post Selection
• Size is determined by weight to be supported and length of post.
• Post must support 19.8 kips.
• Post length is 8 feet.
• Chart (Figure 11-32 in text) shows that a 3" post will support 34 kips.
Weight Calculations Example
• Weight supported by each post.
Weight Calculations Example
• Steep pipe columns load table.

(American Institute of Steel Construction)