Girder Load [SIG]
Girder Load
Girder loads can be defined based on the selected girder, construction stage, applied flange, and magnitudes in terms of forces and moments.
Girder: Select the girder to which the load will be applied.
Stage: Choose the stage at which to apply the load.
Applied Flange [Top/Bottom]: Specify the flange as either the top or bottom using this parameter.
Fx : Force in the longitudinal direction along the PGL.
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 or gravity direction. For usual loads (wearing surface loads - stay-in-place formwork loads), the user should input positive values.
Mx : Moment in the longitudinal direction along the PGL.
My : Moment in the direction perpendicular to the PGL.
Mz : Moment in the vertical direction.
Although Fz is applied in the direction of gravity (positive values for Fz will correspond to the downward direction, as with gravity), Mz will have a positive direction relative to the +Z axis or, in other words, in the upward direction.
The Directions of Forces
See the figures provided below for further clarification on the directions of positive forces. The figures below are taken from the start station of the bridge model.