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Calculation of allowable span lengths for CLT vibration has been implemented using the procedure in CSA O86-19 A.8.5.3.
Settings
Design Settings allow you to specify whether vibration design using CSA O86 A.8.5.3 is performed for floor panels, and to allow you to enter a percentage span adjustment increase for manufacturers performance expectations as allowed by A.8.5.3 Note 3.
For multiple span floor panels, a checkbox in Beam Input view allows you to apply the 20% vibration span increase for non-structural elements from CSA O86 A.8.5.3.
Design
The allowable vibration span is calculated as
lv <= 0.11 EIeff0.29 / m0.12
where EIeff is in N-m2 and m is the mass per square meter of the panel.
Although the equation is derived for simple spans, the allowable span is compared with the longest span on a multi-span member, as is allowed by Note 1.
Vibration is a design criterion shown in the Analysis vs Allowable Stress output table, and Inadequate vibration span lengths are indicated by a failure warning message.
Allowable Span Increases
The allowable span is then increased by the largest of the performance increase or the non-structural element increase. Both increases are not applied simultaneously.
The non-structural element increase is not applied to spans greater than 8 m (26.25 feet in length) and will increase spans less than 8 m only as far as 8m.
A design note appears if either of these increases has been applied.