ACI 318-19 Anchor Bolt Design Seismic Provisions -
Overstrength Factor Ωo
For anchor bolt design when SDC>=C and E>0.2U, anchor bolt design shall satisfy
For tension , one of the 4 options in ACI 318-19 17.10.5.3 (a)~(d) or
For shear , one of the 3 options in ACI 318-19 17.10.6.3 (a)~(c)
The most practical option engineer can choose is
For tension , ACI 318-19 17.10.5.3 (a)~(d) , use option
(a) or (d) , the author prefers option (a) over option (d)
For shear , ACI 318-19 17.10.6.3 (a)~(c) , use option (c)
For both tension 17.10.5.3 (d) and shear 17.10.6.3 (c) option, user need to increase
the seismic load E by multiplying overstrength factor Ωo
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ACI 318-19 17.10.5.3 Option (d)
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ACI 318-19 17.10.6.3 Option (c)
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Refer to
this link
for more details on how to get Ω
o factor for your design.
1. Once you get the overstrength Factor Ωo , you can incorporate this Ωo factor
into the seismic component in the load combinations as shown
below in red.
2. In Civilbay anchorage program load input fields, input the tensile N
u
and shear V
u loads getting from load combinations where the E component
was increased by multiplying overstrength factor Ωo.
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ACI 318-19 5.3.1
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3. Select Tensile = Option D and Shear = Option C as shown below in Civilbay anchorage
design program.
