PROFIS ENGINEERING
Figure 6.3b. Figure 6.3c.
V ua, y = factored shear load acting in the y direction towards the-y edge = 8000 lb
V ua, y, n = factored shear load in-y direction acting on anchor n =( V ua, y / 8) = 1000 lb / anchor
M tor = factored torsion moment =( V ua, y)( 6 in) = 24,000 in-lb F tor, n = factored torsion load acting on anchor n F tor, n, x = factored torsion load acting on anchor n in the x direction F tor, n, y = factored torsion load acting on anchor n in the y direction
Figure 6.3b [ 61 ] shows the direct shear load distribution on each anchor( V ua, y, n) from V ua, y. Assume V ua, y acts equally on each anchor. V ua, y acts 6 in from the centroid of the anchors in the x- direction. This creates a torsion moment( M tor) about the centroid of the anchors, which creates a load on each anchor( F tor, n) that can be calculated using the anchor geometry and M tor. Figure 6.3c [ 61 ] shows the torsion load distribution on each anchor. The torsion load on each anchor can act in both the x direction( F tor, n, x) and y direction( F tor, n, y). The torsion load direction(+ or-) is used to calculate the net shear load acting on an anchor, and its direction. Table 6.3 [ 61 ] below shows the shear loads that have been calculated for each anchor. The net shear load acting on each anchor with respect to the x direction( V x, net) equals( V ua, x, n + F tor, n, x) and the sum of V x, net equals V ua, x. Note there is no direct shear load( V ua, x) acting in the x direction on the anchors. The net shear load acting on each anchor with respect to the y direction( V y, net) equals( V ua, y, n + F tor, n, y) and the sum of V y, net equals V ua, y.
Table
6.3.
anchor V ua, x, n( lb) F tor, n, x( lb)
V x, net( lb) = V ua, x, n + F tor, n, x
V ua, y, n( lb) F tor, n, y( lb)
V y, net( lb)
= V ua, y, n + F tor, n, y 1 0 286 286(-) 1000(-) 686(-) 1686 2 0 286 286(-) 1000(-) 229(-) 1229 3 0 286 286(-) 1000(+) 229(-) 771 4 0 286 286(-) 1000(+) 686(-) 314 5 0(-) 286(-) 286(-) 1000(-) 686(-) 1686 6 0(-) 286(-) 286(-) 1000(-) 229(-) 1229 7 0(-) 286(-) 286(-) 1000(+) 229(-) 771 8 0(-) 286(-) 286(-) 1000(+) 686(-) 314
ΣV x, net = V ua, x 0 ΣV y, net = V ua, y(-) 8000
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