Composite timber-concrete floor of a family house

This paper contains results of experimental research executed on a composite timber-concrete floor of a reconstructed family house. The composite floor was built on the first storey on the original brick walls after removal of the original roof structure. The new floor consists of timber beams with dimensions of 100/220 mm, with regular spacing at 740 mm intervals and span of about 5.3 m. A concrete slab with a thickness of 70 mm is coupled with the timber beams by inclined self-tapping screws with full thread (Wurth ASSY plus VG 8 x 220 mm). Measurement of deformations and stresses was performed immediately after removing temporary supports. Obtained experimental results were compared to the theoretical calculation models. Basic model represents design calculations based on Eurocode 5, Annex B. The other model is a modification of the first one considering only the effective compressed height of the concrete to global stiffness of composite T-section. Also two "Finite Element Method" (FEM) models were used.