Deflection

Eurocode 2 has two alternative methods of designing for deflection; either by limiting span-to-depth ratio or by assessing the theoretical deflection using the Expressions given in the Eurocode. The latter is dealt with in detail in Chapter 8, originally published as Deflection calculations7.

The span-to-depth ratios should ensure that deflection is limited to span/250 and this is the procedure presented in Figure 3. The Background paper to the UK National Annex8 notes that the span-to-

Figure 2

Simplified rectangular stress block for concrete up to class C50/60 from Eurocode 2

Figure 2

Simplified rectangular stress block for concrete up to class C50/60 from Eurocode 2

Figure 3

Procedure for assessing deflection

Figure 3

Procedure for assessing deflection

t The Eurocode is ambiguous regarding linear interpolation. It is understood that this was the intention of the drafting committee and is in line with current UK practice.

depth ratios are appropriate where the structure remains propped during construction or until the concrete attains sufficient strength to support the construction loads. It can generally be assumed that early striking of formwork will not significantly affect the deflection after installing the cladding and/or partitions9.

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Responses

  • Ellie-louise
    How to check deflection in slab concret design eurocode?
    1 month ago

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