How to check for bolt load calculations for longitudinal saddle load generated during bundle pullout?
This can be done by specifying an external load equal to the bundle pullout load.See example below:
The friction factor = 0.3 is mentioned for a right anchored saddle.
In the calculation report, the longitudinal saddle load for right saddle is computed as follows:
Horizontal Longitudinal Load = friction factor x (total vertical load on saddle 2)
= - 0.3 x (reaction due to weight of equipment for the loading case on saddle 2 + weight of saddle 2)= - 0.3 x (817.3 + 159.8) = - 293.1 daN, negative sign as the reaction is acting to the left
So the bolt shear load is calculated as below:
Max. shear = RaHL/Sb/nb = 293.1/324.3/4 = 0.226 daN/mm2 = 2.26 N/mm2 = 2.26 MPa.
In the same model above, now an equivalent bundle pullout load = 1000 daN is applied axially towardsright at the left tangent line:
This extra load is now seen in the design report:
Horizontal Longitudinal Reaction = -(293.1+1000) = -1293.1 daN
In the bolt calculation this is taken into account:
Max. shear = RaHL/Sb/nb = 1293.1/324.3/4 = 0.997 daN/mm2 = 9.97 N/mm2 = 9.97 MPa.
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