doi:10.3850/978-981-08-7920-4_S1-C16-cd
The Design Model for Inclined Screwnails in Timber-Concrete Composite Beam Interconnection
Saulius Kavaliauskas and Audronis Kazimieras Kvedaras
Department of Steel and Timber Structures, Vilnius Gediminas Technical University, Lithuania.
ABSTRACT
Recently the methods of calculation of load-carrying capacity of dowel type connections are
based on Johansen (1949) theory,which assumes the behavior of thematerial of connectedmembers
and fastener as rigid-plastic. This assumption lets to determine the load carrying-capacity
(yield load) very well for bolted or nailed connections, and only satisfactorily for screwnailed
connections. This paper represents the model for screwnailed connections in timber-concrete
composite beaminterconnection based on the theoreticalmodel of Kochenov (1953) by applying
the additional equations for the embedding and withdrawal deformation of timber grain under
the screwnail, as well, as the basic simplified equations for the design of such type connections.
This model is based on more realistic behavior of element material, and on the limited value of
embedding deformations of the timber under the fastener. The achieved theoretical results are
verified in respect to performed experimental tests results obtained also by other researchers.
Assuming the ultimate value for embedding deformation, the three basic possible failure modes
are represented and the simplified model was developed. The developed design model allows
calculating the load-carrying capacity as well as the corresponding deformation, and precisely
evaluates the failure mode of connections.
Keywords: Timber-concrete composite, Screwnail, Design model, Load-carrying capacity.
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