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5 The calculation of eigenfrequencies are performed based on a number of different parameters.
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7 Based on the concrete strength, the E-modulus is calculated for each step as the strength increases over time. The contribution of the reinforcement in the calculation is also considered.
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9 [[image:1631783159532-840.png]]
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11 As for L, the span is taken depending on the positions of the supports, that are also changed between the differrent stages.
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13 As for the topping, it will be considered with regards to its geometry and material properties, if it is "Cast". "None" or "Wet" will not be considered
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15 It is also considering if the cross section is cracked in some cases. Therefor the frequency might vary to some extent over the different stages.
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17 Note that this is a serviceability check, so any eigenfrequency in ultimate limit state will use design values for materials, and not characteristic values.
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19 Only the deadload of the beam will be considered in //m,,e,,//.
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26 **Contents**
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28 {{toc/}}
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Copyright 2020 StruSoft AB
PRE-Stress Documentation