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7 7  The control is carried out for the first load combination in SLS for each [[chain of dependence>>doc:PRE-Stress.Troubleshooting guides.Load combinations.WebHome]], usually those marked "Release." Formulas to consider are those from EN1168 4.3.3.2.1.
8 8  
9 9  
10 -The general control states that the spalling stress (σsp) must not exceed the spalling capacity (fct).
10 +The general control states that the spalling stress (σ,,sp,,) must not exceed the spalling capacity (f,,ct,,).
11 11  
12 12  
13 -[[image:sigmasp_noexceed_fct.jpg||alt=""]]
13 +[[image:sigmasp_noexceed_fct.jpg]]
14 14  
15 -[[image:sigma_spall_equation.jpg||alt=""]]
15 +[[image:sigma_spall_equation.jpg]]
16 16  
17 -[[image:alpha_e_equation.jpg||alt=""]]
17 +[[image:alpha_e_equation.jpg]]
18 18  
19 19  where:
20 20  
21 21  
22 -fct is the value of the tensile strength of the concrete from the current load combination (see above)
22 +f,,ct,, is the value of the tensile strength of the concrete from the current load combination (see above)
23 23  
24 -P0 is the initial prestressing force just after release in the considered web
24 +P,,0,, is the initial prestressing force just after release in the considered web
25 25  
26 -bw is the thickness of the individual web
26 +b,,w,, is the thickness of the individual web
27 27  
28 -e0 is the eccentricity of the prestressing steel
28 +e,,0,, is the eccentricity of the prestressing steel
29 29  
30 -lpt1 is the lower design value of the transmission length
30 +l,,pt1,, is the lower design value of the transmission length
31 31  
32 32  k is the core radius equal to the ratio of the section modulus of the bottom fibre and the net area of the cross section (Wb/Ac)
33 33  
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45 45  )))
46 46  )))
47 47  )))
48 -
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PRE-Stress Documentation