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Modification factors

4.6.2.2 (UKNA to EC5, NA.2.6) Distribution factor, kdist, equation (4.50) (UKNA to EC5, NA.2.6.2)

Evaluation of ln function, fa (Mathcad adjusted to make it dimensionally correct) Evaluation of function value for, kstrut Evaluation of inequality function for kdist (equation

Evaluation of function value for, kamp

Equivalent floor span, in mm, teq

The modal damping ratio, Z (equation

(a) Check fundamental frequency of the floor (equation (4.46); EC5, equation (7.5)) Approximate natural frequency of the floor - f1 (ignoring the floor stiffness as the flooring is not glued to the joists) (equation (4.46); EC5, equation (7.5)) (Mathcad adjusted to make it dimensionally correct)

kdist = max Ikstmt ■ (0.38 - 0.08 ■ ln(fa)), 0 . 3J kdist = 0.36

1 joist

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