Changes for page Resistance to spalling (hollowcore elements)

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edited by FredrikLagerstrom
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 ... ... @@ -7,27 +7,27 @@ 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 ... ... @@ -45,4 +45,3 @@ 45 45 ))) 46 46 ))) 47 47 ))) 48 -