Performance of Notched Connectors for CLT-Concrete Composite Floors

Minh-Van Thai (1, 2) , Sylvain Menard (2) , Sidi Mohammed Elachachi (1) , Philippe Galimard (1)

1 I2M - Institut de Mécanique et d'Ingénierie
2 UQAC - Université du Québec à Chicoutimi

CLT-concrete composite floor systems are a solution for timber buildings with a long-span floor. It yields a reduction of carbon footprint and even eco-friendly structure at the end of its service life. This study will evaluate the structural performance of notched connectors in the CLT-concrete composite floor, comprised of the serviceability sti ness, maximum load, and behavior at failure. The parameters of the test plan are the loaded edge length, the notch depth, the concrete thickness, and the screw length. Other secondary variables are also assessed, such as di erent loading sequences, speed of test, and timber moisture content. Experimental results prove that the performance of the connector depends significantly but not linearly on the notch depth and the length of the loaded edge. The connector with a deeper notch and a shorter heel will be sti er and more robust, but it also tends to have a brittle rupture. The test results also help validate a solution for deconstructable connector systems. A nonlinear finite element model of the connector is built and validated versus the experimental results. It yields reasonably good predictions in terms of resistance and can capture the load-slip relationship.

Mots clés: shear test; CLT-concrete; notched connector; finite element model; timber-concrete composite floor; screw; deconstructable composite floor

Domaines: Matériaux composites et construction; Mécanique des structures [physics.class-ph]

Minh-Van Thai, Sylvain Menard, Sidi Mohammed Elachachi, Philippe Galimard. Performance of Notched Connectors for CLT-Concrete Composite Floors. Buildings, 2020, 10 (7), pp.122. ⟨10.3390/buildings10070122⟩. ⟨hal-03353129⟩