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Hollow Pot Slab (One way Spanning Hollow Forms) Load Sharing? 1

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YuleMsee

YuleMsee

Structural
Apr 8, 2018
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Layouts___Reinforcement_15-11-2022-Model_spunut.png


I have a slab, made of hollow forms 375mm thick with a 75mm concrete topping reinforced with A98 steel mesh, 5mm wires at 200mm square spacing, total depth 450mm, 125mm wide joists spaced at 500mm on centre.
Partition walling needs to be introduced, some running parallel to the joists, when analyzed a single joist cannot carry the 4m high wall, 16KN/m line load. Can the concrete topping enable load sharing to the two adjacent neighboring joists to load share? In this scenario the joist are okay.
 
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The thicker the slab is the better it will help with load sharing. These systems are not great for load sharing and I certainly wouldn't go as far as to say that the mere presence of a slab of any thickness would assure good load sharing. To an extent, you should be able to determine the slabs ability to share load laterally by calculating its flexural capacity.
 
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Contribution of the adjacent neighbor joists should not be neglected. I remember some tests which proves the substantial contribution of adjacent joists .

I will suggest you to analize with a model ( FEM the concrete overtopping and joists with line elements connected to the plate mesh with rigid links ) and see the contribution of other joists ..










Tim was so learned that he could name a
horse in nine languages: so ignorant that he bought a cow to ride on.
(BENJAMIN FRANKLIN )

 
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I did a little section sketch of the slab based on your input.

Did I get it right?

Hollow_pot_slab_X2_faer2h.jpg


If so I would do a slab with ribs in FEM and see how the load transfers based on stiffness.
 
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