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5 = Resistance to spalling (hollowcore) =
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FredrikLagerstrom 5.1 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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FredrikLagerstrom 6.1 10 The general control states that the spalling stress (σ,,sp,,) must not exceed the spalling capacity (f,,ct,,).
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FredrikLagerstrom 6.1 13 [[image:sigmasp_noexceed_fct.jpg]]
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FredrikLagerstrom 6.1 15 [[image:sigma_spall_equation.jpg]]
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FredrikLagerstrom 6.1 17 [[image:alpha_e_equation.jpg]]
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FredrikLagerstrom 5.1 19 where:
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FredrikLagerstrom 9.1 22 f,,ct,, Value of the tensile strength of the concrete from the current load combination (see above)
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FredrikLagerstrom 9.1 24 P,,0,, Initial prestressing force just after release in the considered web
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FredrikLagerstrom 9.1 26 b,,w,, Thickness of the individual web
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FredrikLagerstrom 9.1 28 e,,0,, Eccentricity of the prestressing steel
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FredrikLagerstrom 9.1 30 l,,pt1,, Lower design value of the transmission length
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FredrikLagerstrom 9.1 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