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Floor Vibration

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.

See Also

CLT Design

PRG 320 Table A-1 - Strength Properties

Effective Stiffness EIeff

PRG 320 Table A-2 and O86 8.4.3.1 - Bending Moment Resistance

PRG 320 Table A-2 and O86 8.4.4.2 - Shear Resistance

CLT Handbook 8, 4.1.4.1 - Axial Design for Wall Panels

Effective Shear Modulus GAeff