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Q. How is the horizontal seismic force applied in AutoPIPE Vessel, is it a uniformly distributed load along the height of the vessel?
Ans: The seismic force is distributed along the height of the vessel but not uniformly distributed, it is distributed as a proportion of the inertial mass of each section times the distance from the datum:
Fx (horizontal force on a section) = Cvx * V
Where Cvx = wx.hx/(sum wi.hi), wx=weight of each section, hx = distance from the datum of that section.