The deformation of the structure or any part of it should not adversely affect its efficiency or appearance. Deflections should be compatible with the degree of movement acceptable by other elements including finishes, services, partitions, glazing and cladding; in some cases a degree of minor repair work or fixingadjustment to such elements may be acceptable.
Where specific attention is required to limit deflections to particular values, reference should be made to 3.2 of BS 8110-2:1985; otherwise it will generally be satisfactory to use the span/effective depth ratios given in Section 3 for reinforced concrete.
How to calculate beam deflection for concrete by refer to BS 8110-1:1997 ?
Deflection is influenced by the amount of tension reinforcement,also with compression reinforcement and its stress. The span/effective depth ratio should therefore be modified according to the ultimate design moment and the service stress at the centre of the span (or at the support in the case of a cantilever).
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