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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
What you need today
  • Text
  • Notebook
  • Calculator (optional)
  • 1/8” = 1’ print of foundation (basement) plan
    • With dimensions
types of structure loads
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.
beams and girders
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.
loads on the beam
Loads on the beam
  • 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
Values for residential buildings
  • 1st floor
    • live load + dead load = 50 lbs/ft2
  • 2nd floor
    • live load + dead load = 50 lbs/ft2
  • Ceiling
    • live load + dead load = 30 lbs/ft2
  • Walls
    • dead load = 10 lbs/ft2
  • Roof has no load on the beam
here s what you need
Here’s what you need
  • Calcualtor
  • NOTEBOOK!
  • Copy of floor plan or foundation plan
  • Architect’s Scale
  • Determine where your beam(s) will go
slide11

How much weight does your beam need to support?Time to do the math . . .

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
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
load assumptions
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.
weight calculations example
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 example1
Weight Calculations Example
  • Foundation of the house.
weight calculations example2
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
Beam capacity tables
  • S-Beam (p.249)
    • standard I-beam
  • W-Beam (p.249)
    • wide flange I beam
  • Wood beams
    • Microllam®
weight calculations example3
Weight Calculations Example
  • W-beam span and load table.

(American Institute of Steel Construction)

weight calculations example4
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 example5
Weight Calculations Example
  • Three supporting posts are added.
weight calculations example6
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 example7
Weight Calculations Example
  • Weight supported by each post.
weight calculations example8
Weight Calculations Example
  • Steep pipe columns load table.

(American Institute of Steel Construction)