Self-tensioning long-span T-shaped spruce and oak web floors with a CLT upper flange. An experimental approach

Experimental, analytical and numerical vibration analysis of long-span timber-timber composite floors in self-tensioning and non-tensioning configurations

“…Static tests performed previously [1,2,3] showed behaviour very similar to fully composite action, with minimum slip at the interfaces. In this case the transformedsection method is applicable, determining the neutral axis and the section properties of the composite section.…”

“…A simplified expression for orthotropic plates was proposed by Ohlsson [45], under the hypothesis that D xy is approximately equal to D y (3). This expression can be rewritten (4) in relation to the stiffness properties of the floor in the main direction (EI x ) and the transverse direction (EI y ), span length (L), width (B) and mass (m).…”

“…This multiplier device, patented as SsS [1], introduces an eccentric post-stressing force on the T-section, transforming the vertical loads transmitted to the supports into a horizontal tensioning force. The configuration of the device multiplies the load value, forming a mechanism that significantly improves the bending behaviour of the structural element and reduces its deflection under any load arrangement [2,3]. The effectiveness of the system allows highly slender sections and a significant reduction in self-weight in relation to maximum admissible load, which is more important in long-span situations.…”

Timber-Timber-Composite (TTC) beam long-term behaviour. Full scale experimental campaign and simplified analytical model

“…A complete analysis of this system, its advantages and short-term behaviour have been previously carried out by this research team [40,41], showing excellent behaviour in long-span configurations, with extremely slender sections that show high stiffness. The campaign was developed under the same variable environmental conditions, for a period of 630 days (15120 h).…”