EUROCODE 2 WORKED EXAMPLES - Federbeton

EC2 – worked examples 4-1
SECTION 4. WORKED EXAMPLES – DURABILITY
EXAMPLE 4.1 [EC2 clause 4.4]
Design the concrete cover of a reinforced concrete beam with exposure class XC1.
The concrete in use has resistance class C25/30.
Bottom longitudinal bars are 5φ 20; the stirrups are φ 8 at 100 mm.
The max aggregate size is: dg = 20 mm (< 32 mm).
The design working life of the structure is 50 years.
Normal quality control is put in place.
Refer to figure 4.1.
Table of Content
Fig. 4.1
From table E.1N - EC2 we see that, in order to obtain an adequate concrete durability, the
reference (min.) concrete strength class for exposure class XC1 is C20/25; the resistance
class adopted (C25/30) is suitable as it is higher than the reference strength class.
The structural class is S4.
First, the concrete cover for the stirrups is calculated.
With:
cmin,b = 8 mm
We obtain from table 4.4N - EC2:
cmin,dur = 15 mm
Moreover:
Δcdur,γ = 0 ;
Δcdur,st = 0 ;
Δcdur,add = 0 .
From relation (3.2):
cmin = max (cmin,b; cmin,dur + Δcdur,γ - Δcdur,st - Δcdur,add; 10 mm) =
max (8; 15 + 0 – 0 – 0; 10 mm) = 15 mm