A2 - Floor Discontinuities
ICONS
A = Gross floor area
A b = Total void areas
A2 - Floor Discontinuities: In any floor slab (Figure 3.2) ;
I - Including stairs and elevator shafts, the total of void areas exceeding 1/3 of the floor gross area,
II - The presence of local floor gaps that make it difficult to safely transfer earthquake loads to vertical bearing system elements,
III - Sudden decreases in the in-plane rigidity and strength of the floor in case of
TBDY Article 3.6.2.2 - In buildings with A2 and A3 type irregularities, floor slabs will be modeled with two-dimensional plate (membrane) or shell finite elements to show that they can safely transfer earthquake forces between vertical bearing system elements in their own planes (See 4.5.6.2 ).
![](../__attachments/1083605296/image-20200529-114719.png?inst-v=e297b259-93ee-4526-bee7-06170d782e4d)
According to Article 4.5.6.2 - 3.6.2.2 of TBDY , in buildings where there are A2 and A3 type irregularities and / or floors are not intended to operate as a rigid diaphragm , and in slab systems without reinforced concrete beams, floors will be modeled with two-dimensional finite elements.
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