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Transfer Slabs

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Charlie95

Structural
Oct 14, 2021
4
Hi everyone,

Looking to get advise/comments on the following.


Capture_wzzzbu.png


In the attached image, inside the green thick line is a 800mm slab and on the outside is a 300mm slab. The orange represents the moment capacity of a 800mm slab. As you can see some parts of the 300mm slab technically are required to be 800mm due to the moments 'spilling'. When I increase the extent of the 800mm slab to capture this, the moments 'run away' and the slab extent is required to get bigger and bigger. The question is, is there a way to justify the moments spilling and parts of the 300mm slab being over the moment capacity? Otherwise the extent of the slab gets excessive.
 
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Although some FEM resources are beneficial for visualizing behavior - I consider them to be a secondary tool.

Can you provide us with some further context? Locations of columns above and columns below. Lengths between supports. Magnitude of loads.
 
I expect that you'll have to accept some degree of moment redistribution at the boundary. Mesh refinement might also help mitigate the impact.
 
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