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Spring 2007
Lab # 14— Bracing for formwork oO
ties @G@CGES
Lab division() 2
(circle one)
Show all catculations.
State and explain all assumptions.
List all tables and charts that are used
A wall form is 124 feet long and 16 feet high. It rests on a footing and the top of the footing is about
level with the surface of the ground. This form will be used to construct a concrete wall that is 157-10"
high above the footing.
1. Assuming that the project is in an area of relatively strong winds and that the local building code
requires a uniform wind design pressure of 22 psf what is the total wind force (in pounds) acting
against the side of the form?
2. Draw the freebody diagram for a one foot length of the wall form showing the lateral wind load
acting on this one foot section and the reaction forces that must exist to produce equilibrium.
Find the reaction forces that must exist to resist the wind pressure.
3. Regardless of wind pressure loads what minimum load should be applied to the top of the wall
form and used to design the bracing according to ACI recommendations?
What loading at the top of the wall would you use to design a bracing system for this form?
Guy cables attached to the wall form 3 feet below the top of the form are used on each side to
brace this form. The guys are anchored to a line of existing spread footings that will support
steel columns in the building frame. The distance from the center line of the wall to the footings
on the east side is 16 feet. The distance to the footings on the opposite (west) side is 18 feet.
The spacing between the footings on both lines is 10 feet center to center of the anchor bolt
pattern, Ifa guy cable is anchored at each of the available footings what is the maximum tension
in the cables attached to the east side of the form?
What is the maximum tension in the cables on the opposite side?
What is the horizontal force on the east side footings from the anchored cables?
What is the horizontal force on the west side footings from the anchored cables?
What is the vertical force on the east side footings from the anchored cables?
0, Whit is the vertical force on the west side footings from the anchored cables?
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380Lab14 spring 2007.doc
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