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5 = Resistance to spalling (hollowcore) =
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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.
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10 The general control states that the spalling stress (σ,,sp,,) must not exceed the spalling capacity (f,,ct,,).
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13 [[image:sigmasp_noexceed_fct.jpg]]
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15 [[image:sigma_spall_equation.jpg]]
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17 [[image:alpha_e_equation.jpg]]
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19 where:
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22 f,,ct,, Value of the tensile strength of the concrete from the current load combination (see above)
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24 P,,0,, Initial prestressing force just after release in the considered web
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26 b,,w,, Thickness of the individual web
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28 e,,0,, Eccentricity of the prestressing steel
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30 l,,pt1,, Lower design value of the transmission length
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32 k Core radius equal to the ratio of the section modulus of the bottom fibre and the net area of the cross section (W,,b,,/A,,c,,)
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42 **Contents**
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44 {{toc/}}
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Copyright 2020 StruSoft AB
PRE-Stress Documentation