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Question: design falsework to support a flat slab floor 10 inches...

Question details

Design falsework to support a flat slab floor 10 inches thick using normal weight concrete, construction grade Douglas Fir-Larch framing members and wood shoring. Ceiling height is 10 feet and bays are 16 x 16 feet. Since the forms will have continuing reuse, do not adjust base design values for short-term load.

Do the following:

  1. Design the falsework (spacing and size of the joists, cap beams, and posts) using the design formulas in the text.
  2. Design the falsework (spacing and size of the joists, cap beams, and posts) using the design tables in the text.
  3. Check the bearing capacity and buckling of the posts.
  4. Draw the diagram of all formwork components. All sketches must be clearly defined, include dimensions, and be neatly presented.

Include all equations, diagrams, table references, and other details of your work.

Begin by using ¾” plywood, 4”x4” joists, 3”x6” cap beams, and 4”x4” posts. Adjust the size of the members as needed to meet the design requirements and reduce cost.

Properties

Concrete unit weight = 160 lb/ft3

Plywood: Fb=1930psi, Fv=72 psi, E=1,650,000 psi. Maximum deflection = l/360 but not more than 1/16”

Lumber: E=1,600,000 psi, Fb=1250psi (3x6) and 1500psi (4x4), Fv=90 psi, Bearing stress parallel to the grain = 625 psi.

Maximum deflection = l/360 but not more than 1/4”

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