There is much potential for engineered wood products (EWP) to be used beyond low-rise residential construction when incorporating the notion of hybrid systems like timber-concrete-composites (TCC). TCC systems are comprised of a timber element connected to a concrete slab through a shear connection. By combining the complimentary properties of timber and concrete, the performance of timber floors can be enhanced, including bending stiffness, load-bearing capacity, dynamic response, airborne sound transmission, structural fire rating, and thermal mass.
A large number of T-beam TCC systems existed for decades; however, the growing availability of panel-type EWP in North America offers designers greater versatility in terms of structural and building physics performance. While stiffness and strength design of TCC systems is straight-forward, there is little design guidance available in terms of vibration and long-term performance. The design guidance provided by this presentation is based on European experience as well as the largest experimental test program conducted to date in North America.
The bending, vibration and long-term performance for a range of TCC systems in several EWPs were validated on small-scale shear tests, floor panels subjected to serviceability loads for 2.5 years, and subsequent full-size bending tests. The tests confirmed that calculations according to the γ-method can predict the basic stiffness and dynamic properties of TCC floors within a reasonable degree of accuracy.
This presentation will provide insight to designers, engineers and code officials into safely designing TCC floor systems for bending, vibration and long-term performance.