PROFIS ENGINEERING
Reference Figure 6.2.3c [ 56 ]. Shear Load Evaluation – Concrete Breakout at x- Edge( page 54) explains how PROFIS Engineering calculates shear load eccentricity( e c, V) when concrete breakout is assumed towards the x- edge. The torsion load components acting on each anchor created by( V ua, y)( 6 in) must utilized along with the direct shear load from V ua, x acting on each anchor( V ua, x / 6 anchors)( reference Table 6.2.2 [ 55 ]) to calculate the shear eccentricity with respect to concrete breakout towards the x- edge. ACI 318 provisions are predicated on using V ua, x to calculate e c, V. ACI provisions check ϕV cbg, x ≥ V ua, x. Shear Load Evaluation – Concrete Breakout at x- Edge( page 54) explains how PROFIS Engineering conservatively uses V ua, res to calculate e c, V in lieu of V ua, x and conservatively checks ϕV cbg, x ≥ V ua, res.
Figure 6.2.3d.
Reference
Figure 6.2.3d [ 57 ]. Shear Load Evaluation – Concrete Breakout at y- Edge( page 52) explained how PROFIS Engineering calculates shear eccentricity( e c, V) with respect to concrete breakout towards the y- edge using V ua, res in lieu of V ua, y. e c, V is used to calculate the modification for shear eccentricity( ψ ec, V), which is used to calculate design concrete breakout strength at the y- edge( ϕV cbg, y).
Reference Shear Load Acting at a Corner( page 18). For this example, when considering concrete breakout with respect to the y- fixed edge, ACI 318 Case 1 / Case 2 provisions are relevant for the anchorage geometry shown in Figure 6.2.3d [ 57 ]. ϕV cbg, y is calculated for row 1, row 2 and row 3. The modification factor ψ ec, V is included in the concrete breakout calculation as shown below.
ψ ec, V =
1 1 + e c, V
1.5c a1
where e c, V is calculated using V ua, res per Shear Load Evaluation – Concrete Breakout at y- Edge( page 52)
ϕV cbg, y = ϕ A Vc
A Vco ψ ec, V ψ ed, V ψ c, V ψ h, V V b where: ϕV cbg, y, row 1 is calculated using c a1, row 1 = 6 in( reference Figure 6.2.3d [ 57 ]) ϕV cbg, y, row 2 is calculated using c a1, row 2 = 12 in( reference Figure 6.2.3d [ 57 ]) ϕV cbg, y, row 3 is calculated using c a1, row 3 = 18 in( reference Figure 6.2.3d [ 57 ])
Per Case 1 / Case 2, shear load is assumed to be distributed proportionately among each row. PROFIS Engineering conservatively uses V ua, res in lieu of V ua, y such that:
V ua, res, row 1 =( 0.33)( V ua, res) PROFIS Engineering assumption V ua, res, row 2 =( 0.67)( V ua, res) PROFIS Engineering assumption
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