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Fy: Force in the direction perpendicular to the PGL.
Fz (Gravity): Force in the vertical direction. A positive value indicates a load in the global -Z direction (or gravity direction). For usual loads(wearing surface loads - stay-in-place formwork loadstypical loads, such as wearing surface loads (with the understanding that this load will be applied to the deck as a whole, while the wearing surface may only cover part of the deck, such as the area between the barriers and in this case, the Static Loads - Surface Load can be used ), the user should input positive values.