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220.127.116.11 Limitation of reinforcing steel stress
Limitation of reinforcing steel stress
In window 1.3 Surfaces, the tension stresses of the reinforcing steel reinforcement are limited to σs,max = 0.8 ⋅ fyk according to EN 1992-1-1, clause 7.2(5) (see Figure 2.90). For BSt 500 S (B), the maximum steel stress σs,max is thus determined as:
The maximum stress σs,max is to be compared with the provided tension stress for both reinforcement directions.
The provided tension stress σs is determined as follows:
relation of elastic moduli (Es / Ecm)
depth of concrete neutral axis
width of element (always 1m for plates)
provided tension reinforcement
ideal moment of inertia in state II
With the values calculated in chapter 18.104.22.168, the provided tension stresses σs,u,φ1 and σs,u,φ2 in the two reinforcement directions φ1 and φ2 can be determined as follows:
The existing tension stresses σs,-z,φ1 and σs,-z,φ2 are therefore smaller than the maximum steel stress σs,max (see Figure 2.90). The governing quotient of existing to allowable steel stress is available in the reinforcement direction φ1. The design is fulfilled.