| Summary: | Timber-concrete composite (TCC) systems are a construction technique used in
rehabilitation works of existing timber floors and for new construction such as multistory
buildings and short-span bridges. The system combines high tensile strength of
timber beams and high compressive strength of concrete slabs, which act compositely
together. Therefore, adequate mechanical performance to these composite structures
must be assured using shear connectors characterized by sufficient resistance and
stiffness. This research study will evaluate the effect of different formations of screw
connections, mainly in shear-tension formation and shear-compression formation. The
effect of screw connection on shear-tension and shear-compression will be analyzed by
plotting the shear force capacity and stiffness graph against the known parameters. The
R-squared value related to the trendline will be displayed on the graphs to interpret the
data. The value of R2 greater than 0.5 indicates that the dependent variable highly
influenced the independent variable. In this paper, a new empirical model to calculate
the shear force capacity and stiffness of timber-concrete composite (TCC) joints made
with inclined screws, specifically in shear-tension is proposed and compared to models
derived by Gelfi et al. (2002), Moshiri et al. (2014), and Symons et al. (2010). The models
will be compared based on their mean, standard deviation, coefficient of variance, and
regression value. A comparison between the new proposed model with the other models
is reported and critically discussed in terms of both shear force capacity and stiffness. It
was observed that the new empirical model of the shear force capacity and stiffness has
R2 values of 0.9364 and 0.5118, respectively. The value of R2 obtained from plots of
both empirical models was higher than that obtained from other model plots. The finding
indicates that the new empirical model can better predict shear force capacity and
stiffness in TCC connection.
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