## 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.

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 4

Determination of steel stress

Figure 3

Procedure for assessing deflection

Figure 4

Determination of steel stress

ss can be calculated from the expression: ss = ssu (^s,req ) (-1)

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