PROFIS ENGINEERING
Special Cases for the Band Width Approach
Figure 5.3a.
Figure
5.3a [ 42 ] illustrates what can be termed a“ regular” or“ matrix” anchor layout consisting of four anchors that are aligned in a diamond pattern to form rows and columns. Assume anchor 1 and anchor 4 are equidistant from the x- edge; therefore, these two anchors are aligned to form a column( col 2) with respect to the x- edge. Similarly, assume anchor 2 and anchor 3 are equidistant from the y- edge; therefore, these two anchors are aligned to form a row( row 2) with respect to the y- edge. When two or more anchors are aligned to form a row and / or a column, the band width approach is not applicable. Instead, ACI 318 shear concrete breakout provisions can be used directly, i. e. consideration of Case 1 / Case 2 and / or Case 3 for the rows and columns that make up the anchorage.
If shear concrete breakout was being considered for the x- edge, anchor 2 would constitute a column( col 1), anchors 1 and 4 would constitute a column( col 2) and anchor 3 would constitute a column( col 3). Case 1 / Case 2 and / or Case 3 for each column would be predicated on the spacing in the x direction between columns. Shear concrete breakout strength for each column( ϕV cb( g), col n) would be checked versus the shear load assumed to act on each column( V ua, x, col n).
If shear concrete breakout was being considered for the y- edge, anchor 1 would constitute a row( row 1), anchors 2 and 3 would constitute a row( row 2) and anchor 4 would constitute a row( row 3). Case 1 / Case 2 and / or Case 3 for each row would be predicated on the spacing in the y direction between rows. Shear concrete breakout strength for each row( ϕV cb( g), row n) would be checked versus the shear load assumed to act on each row( V ua, y, row n).
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