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Flat plate floors with shears at perimeter and internal columns

Flat plate floors with shears at perimeter and internal columns

Flat plate floors with shears at perimeter and internal columns

(OP)
I have a one-storey building supporting the big tanks for beer producers. Each tank is supported by three columns. Due to the big seismic force, shear walls are introduced.

The structural system:
  Shear walls on each corner (L-shaped walls);
  3 internal columns on each tank location to support tank gravity loads;
  Suspendid floor with openings as service level.

I have a simple etabs model, with shearwalls, with columns pinned at top, with suspendid floor, having no beams.

The results showed quite big moments on top of the wall piers due to seismic loads. How are the big moments in the walls at top transferred to the suspendid slab? I modelled the suspendid slab as shell elements and meshed. Even I set the property modifiers all zeros for the shell elements, I still found the moments on top of wall piers. How to get rid of the moments?

Urgent help needed. Any guys can reply? Thanks in advance.

RE: Flat plate floors with shears at perimeter and internal columns

(OP)
I have a one-storey building supporting the big tanks for beer producers. Each tank is supported by three columns. Due to the big seismic force, shear walls are introduced.

The structural system:
  Shear walls on each corner (L-shaped walls);
  3 internal columns on each tank location to support tank gravity loads;
  Suspendid floor with openings as service level.

I have a simple etabs model, with shearwalls, with columns pinned at top, with suspendid floor, having no beams.

The results showed quite big moments on top of the wall piers due to seismic loads. How are the big moments in the walls at top transferred to the suspendid slab? I modelled the suspendid slab as shell elements and meshed. Even I set the property modifiers all zeros for the shell elements, I still found the moments on top of wall piers. How to get rid of the moments?

Urgent help needed. Any guys can reply? Thanks in advance.  

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