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Head Diam.: The diameter of the head is used in conjunction with the shank diameter to calculate the effective surface area of the head.
EffShank Len. Length: The effective length of the shank is measured from the base of the head to the back face of the plate.
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Threads per [unit of length]: # of threads per unit of length.
EffEmbed. Len. Length: The embedment length is the distance from the face of the concrete to the outermost part of the bolt.
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Bar Size: Bar size is the US designation, 3-11.
EffEmbed. Len. Length: The effective embedment length is measured from the back face of the plate to the end of the bar. For DBA’s, the program sets both hef and lb equal to the user assigned embedment length.
Anchor Group Layout
The spacings and edge distances of the anchor group input in this section are shown in the dynamic, scaled 2D sketches below the input. Some of the anchor dimensions can be input in the both the sketch and the accompanying text box for that dimension.
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Concrete Edge Distances (to Plate): Pressing the infinity button will mark that edge distance as infinite. Note that doing this will cause the algorithm to skip some calculations. If you do not want to skip any calculations, but still want to model a very large edge distance, set the edge distance to 99 inches. This is especially significant for PCI designs, as the program will assume that an edge will influence the design as a two-parallel-edge condition unless you set one of the edge distances to infinity.
Top edge to first row: Distance between the top edge of the plate and the centerline of the closest row.
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Support brackets are commonly welded to embedded plates, but are not required in this analysis.
Eff. Depth: Distance from center of the tension force to the extreme compression ‘face’ (the bottom edge of the vertical element(s) of the bracket).
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.
Note: Bracket Dimension can be 0, only if both Mux=0 and Muy=0.
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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