In this tutorial, we will learn how to model analyse and design raft foundations.
Step 1
As with all our previous tutorials on foundations here, here and here, open the 'St:00' storey. With the storey open, delete all the pad foundations there. In the region slated for raft foundations in our 'LearningOrion' tutorial, Create a slab of 600mm depth using the Axis Region slab insertion method (because there are no beams in the foundation.)Step 2
Next, we model 1m cantilever slabs around the edges of the created slab. We do this by selecting the slab iconStep 3
To carry out reinforcement design, introduce an FE slab strip. For this, click 'Slab Strip'Step 4
The analysis and design for raft foundation is based on Finite Element (FE.) Click 'Run' in the menu toolbar, then 'FE Raft Foundation Analysis'. Under 'Floor Mesh and Analysis' in the dialog box that appears, click 'Raft Foundation Mesh And Analysis'. In the 'Mat Foundation Analysis' view, click 'Generate Model'. The mesh for the slab is generated. Close this view to automatically begin the analysis.Step 5
Click 'Analysis Post-Processing' to view the contour diagrams for different areas of the raft foundation. To design reinforcement, click, then right click on the slab strip created earlier, select 'Properties' and click 'Update'.For comments and questions, you can reach us through the contact form below. You can also subscribe to receive our weekly newsletters so that you never miss a thing.
ORION 18: HOW TO MODEL, ANALYSE AND DESIGN RAFT FOUNDATIONS
Reviewed by Izuchukwu Obi
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