RF-CONCRETE Surfaces – Online Manual Version 5

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RF-CONCRETE Surfaces – Online Manual Version 5

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2.6.4.11 Design of rebar spacing

Design of rebar spacing

In the Longitudinal Reinforcement tab of window 1.4 Reinforcement, a rebar spacing of a = 100 mm has been specified for both reinforcement directions by using the [Rebars] button.

Figure 2.105 Import Reinforcement Area Due to Rebar dialog box

The maximum rebar spacing max sl,-z,φ1 is determined by interpolation according to EN 1992-1-1, Table 7.3N for the existing tension stress σs,-z,φ1 = 208.18 N/mm2 and the crack width wk = 0.3 mm.

Figure 2.106 Maximum values of rebar spacings according to EN 1992-1-1, Table 7.3N

max sl, -z,ϕ1 = 250 + 250 - 200200 - 240 · 208.18 - 200 = 139.8 mm 

Analogously, the maximum bar spacing for the direction φ2 is determined from the existing tension stress σs,-z,φ2 = 167.09 N/mm2 as max sl,-z,φ2 = 291.1 mm.

Figure 2.107 Maximum rebar spacings in both reinforcement directions

The existing rebar spacing sl,exist,-z,φ1 = 100 mm available for the reinforcement direction φ1 is smaller than the maximum allowable rebar spacing max sl,max,-z,φ1 = 240 mm.

Therefore, the following check criterion applies for the reinforcement direction φ1:

sl, exist,-z,ϕ1max sl,max,-z,ϕ1 = 0.1000.240 = 0.417 

Figure 2.108 Check criterion for rebar spacing