DESIGN OF LATERAL BRACING

For wall forms, lateral bracing is usually provided by inclined rigid braces. Bracing is usually required to resist wind loads and other horizontal loads. Since wind load may be applied in either direc­tion, braces must be arranged on both sides of the forms. When rigid braces are used, they may be placed on one side of the form if designed to resist both tension and compression. Figure 7.1 gives a visual example of form bracing.

DESIGN OF LATERAL BRACING

DESIGN OF LATERAL BRACING

Figure 7.1 Bracing of formwork.

 

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Design load for bracing can be calculated using the following equa­tions:

 

P = l = (h ‘2 + l’2)1/2

hl

where

P = strut load per foot of the form, lb/ft H = lateral load at the top of the form, lb/ft h = height of the form, ft h’ = height of the top of strut, ft l = length of strut, ft

T = horizontal distance from bottom of strut to form (ft)