In SFA, it is possible to define a mat of varying thickness by assigning different control regions to different portions of the mat and then assigning different slab thickness to each control regions. However you may want to consider some facts. If some lean concrete is being poured on top of the slab to generate the slope then does it have any impact on the stiffness analysis or are you even going to consider that additional overall depth for reinforcement calculation ? If not, then I would just suggest not modeling the slope.
The answers to your other questions are :
The level and sloped mat can definitely be within the same file as long as these are within the same boundary. These will be under separate control regions within the same boundary as explained in the paragraph above.
The loads will always be placed at the level of the nodes or at the center of the plates. There is no direct way to find the elevation of the top of the mat. You can find out the elevation of the node which is at the center and then add half the slab thickness to it.
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RE: STAAD Foundation Advanced v 7.2 - mat foundation
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