Prediction of motion responses of cross-laminated-timber slabs

Cross-laminated-timber (CLT) floor slabs have clustered modal frequencies, with higher order modes significantly influencing motions caused by dynamic footfall forces. Presented analyses address dependence of predicted slab motions on construction details and modal frequency filtering decisions. Based on the results, ideas are presented for creating robust vibration serviceability design methods applicable to CLT floor slabs. Those ideas are consistent with ISO limits on human toleration of motions under defined conditions, and design code classifications of building occupancy conditions. Ongoing research is implementing them.