1. Overturning Moment vs Container Ballast Weight
When a 20m span container shelter is subjected to 160 km/h winds, the horizontal lateral wind force generates an overturning moment ($M_{OT}$) about the leeward container base:
$$M_{OT} = sum (F_{wind,i} cdot h_i)$$
To prevent container sliding or tipping without concrete ground anchors, the stabilizing resisting moment ($M_R$) provided by container dead weight plus internal stored cargo must satisfy:
$$ ext{Factor of Safety } (FOS) = rac{M_R}{M_{OT}} ge 1.50$$
Champion provides engineered ballast charts specifying required dead weight ballast (gravel, drill pipes, or water bladders) inside each container.