Abstract
New ultralight materials like cross-laminated-timber (CLT) enable attainment of longer floor spans than are possible with traditional shallow-profile timber construction. Their low modal mass to stiffness ratios make ensuring satisfactory dynamic responses under normal building occupancy conditions a primary design consideration. This paper presents numerical techniques for accurate prediction of modal frequencies, which are essential input to contemporary floor vibration serviceability design criteria. Recommendations are made for minimum requirements for design level prediction of modal responses of CLT floors, based on numerical and experimental studies of effects engineering design variables have on such characteristics.
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