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Eff. Width: Width of the bracket that is compressing the concrete. May be the sum of the width of the vertical elements of the bracket.
The analysis assumes that a compression block forms at the base of the bracket. Using a Whitney stress block, you can write an equilibrium equation:
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Solving for a (the depth of the compression block), gives us the following:
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where: d is the depth of the bracket, b is the width of the bracket, and M is the applied moment
From this, we can see that in order to generate a solution, the value for d must be greater than or equal to:
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Resistance Factors
Include additional strength reduction for seismic design: ACI 318 Section 17.2.3.4.4 contains additional reduction factors in seismic zones. Select this option to include them in the analysis.
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