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Deck: Specify the deck on which to apply the loads.
Fx [kip/ft]: Force in the longitudinal direction along the PGL.
Fy [kip/ft]: Force in the direction perpendicular to the PGL.
Fz [kip/ft]: Force in the vertical direction. A positive value indicates a load in the global -Z or gravity direction. For usual loads(wearing surface loads - stay-in-place formwork loads), the user should input positive values.