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Shear web area and stiffness for cylindrical concrete section e.g. circular water tank

Shear web area and stiffness for cylindrical concrete section e.g. circular water tank

Shear web area and stiffness for cylindrical concrete section e.g. circular water tank

(OP)
Hi,

I am modelling a cicular concrete tank (20m dia, 0.8m wall thickness) using LMBM for seismic analysis. I seek guidance on the shear stiffness and shear web area to be considered. I have the shear modulus 'Gc' of concrete and the shear rigidity as per ASCE 43-05 is Gc x Aw. 'Aw' is the shear web area which for the rectangular section would be the gross cross-section area. However, what value should be considered for a hollow circular section ?

For hollow steel sections the shear area is approximatelt 60% to 67% of the gross cross-section area - is there a similar reduction applicable to concrete elements ?

I would appreceate your guidance.

Thanks.

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