Top slab cut distance and bottom slab cut distance
The "Top slab cut distance" and "Bottom slab cut distance" are user-defined distances that specify what depth of the box girder will be considered as top or bottom slab for the purpose of design. The "Top slab cut distance" is measured downwards from the top of deck and the "Bottom slab cut distance" is measured upwards from the bottom of the box girder - please see the figure below:
