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Suppose there's a pool which is supported by 4 beams (Perimeter beams)and 4 columns. When designing the beam should we consider the moment generated due to the horizontal water pressure? (I'm using BS 8110 for designing)

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    $\begingroup$ Will the beams span the depth of the pool (will they be the pool's "walls")? $\endgroup$ – Wasabi Aug 27 '17 at 2:51
  • $\begingroup$ No, there's a separate RC wall of 1.5m on top of the beam. The beam is 450x225 $\endgroup$ – emil Aug 27 '17 at 2:57
  • $\begingroup$ The stiffness of what is between the water and the beams is important too. $\endgroup$ – John Alexiou Aug 27 '17 at 2:58
  • $\begingroup$ I assume the beams will be supporting the pool's bottom slab, correct? $\endgroup$ – Wasabi Aug 27 '17 at 2:58
  • $\begingroup$ Can we have a sketch of the proposed design? $\endgroup$ – Stilez Aug 27 '17 at 8:44
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The answer depends on the design. The pool walls are going to resist the pressure and in return they are going to "bulge out" a bit. If there is enough clearance between the beams and the walls then the beams are only going to take any incidental side loading of the structure. That is if the column supports are designed correctly and do not induce any moments in the beams.

The devil is in the details, and there aren't much of them included in the question to effectively answer.

PS. Do you have access to any FEA software?

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