PROFIS ENGINEERING
Reference Figure 6.2.2e [ 55 ]. PROFIS Engineering conservatively assumes V ua, res acts towards the x- edge in lieu of V ua, x. Therefore, PROFIS Engineering calculations for“ y” are predicated on using V ua, res in lieu of V ua, x such that the value for“ y” is calculated as follows:
2anchors 1367lb / anchor + 6in * + 2anchors 633lb / anchor −6in * = V ua, x lb yin + 16, 404in − lb − 7596in − lb = 6708lb yin
y = + 1.313in
* reference Figure 6.2 [ 51 ] for anchor geometry
“ y” corresponds to the shear load eccentricity parameter, which is designated e c, V in ACI 318. e c, V is used to calculate the modification 1 factor for shear eccentricity( ψ ec, V): ψ ec, V = 1 + e c, V
1.5c a1
ψ ec, V is used to calculateϕV cbg, x: ϕV cbg, x = ϕ A Vc
A Vco ψ ec, V ψ ed, V ψ c, V ψ h, V V b PROFIS Engineering checks ϕV cbg, x ≥ V ua, res
Summary- Shear Load Evaluation – Oblique Load – Two Fixed Edges( page 56) summarizes oblique shear load calculations
Summary- Shear Load Evaluation – Oblique Load – Two Fixed Edges
Figure 6.2.3a. Figure 6.2.3b. Figure 6.2.3c.
Reference Figure 6.2.3a [ 56 ]. It illustrates a hypothetical anchorage consisting of six anchors. A shear load( V ua, x) acts in the x- direction and a shear load( V ua, y) acts in the y- direction. The resultant shear load( V ua, res) acts at an oblique angle with respect to the x- and y- edges, which are fixed. V ua, y acts 6 in in the-x direction from the centroid of the anchor group. The eccentricity of V ua, y creates torsion on the anchorage. The line of action for V ua, x coincides with the centroid of the anchor group. If V ua, x = 6000 lb and V ua, y = 3000 lb, V ua, res = 6708 lb. When shear load acts towards two edges, shear concrete breakout must be considered for each edge.
Reference Figure 6.2.3b [ 56 ]. Shear Load Evaluation – Concrete Breakout at y- Edge( page 52) explains how PROFIS Engineering calculates shear load eccentricity( e c, V) when concrete breakout is assumed towards the y- 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, y acting on each anchor( V ua, y / 6 anchors)( reference Table 6.2.1 [ 53 ]) to calculate the shear eccentricity with respect to concrete breakout towards the y- edge. ACI 318 provisions are predicated on using V ua, y to calculate e c, V. ACI provisions check ϕV cbg, y ≥ V ua, y. Shear Load Evaluation – Concrete Breakout at y- Edge( page 52) explains how PROFIS Engineering conservatively uses V ua, res to calculate e c, V in lieu of V ua, y and conservatively checks ϕV cbg, y ≥ V ua, res.
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