Abstract
Eurocode 4 design provisions specify two methods for the design of composite slabs, namely the m-k and the partial shear connection (PSC) methods. Currently, the m-k method includes the concrete thickness and the shear span of the slab as variables while the PSC method does not. This has resulted in a better accuracy for the m-k method when slabs with varying dimensions are considered. It is demonstrated in this paper that the horizontal shear bond stress varies with the ratio of shear span to effective depth of slab, defined as the slenderness. To include such an effect, a linear shear bond-slenderness equation is proposed. Using the proposed relationship, a linear interpolation of shear bond strength based on two configurations, determined from the outcomes of the bending tests for compact and slender slabs, has been satisfactorily performed. The shear bond strength obtained from this interpolation can be used in collaboration with the existing PSC method, such that the accuracy of the prediction of the composite slab capacity can be considerably improved, the validity of which has been verified with published results from literatures.
Highlights
Nowadays, the use of the steel-concrete composite slab system is a common practice especially in the steel framed buildings
It has been shown in Abdullah and Easterling (2009) that the horizontal shear bond depends on the geometry of the slabs, the most important parameter of which is the ratio of the shear span to the effective depth, Ls/d, otherwise defined as the slenderness
It can be demonstrated that the ultimate load calculated using the improved partial shear connection (PSC) method employing the shear bond-slenderness equation is as accurate as that calculated using the m-k method
Summary
The use of the steel-concrete composite slab system is a common practice especially in the steel framed buildings. It was found that the contact strength and the overall behavior of composite slab is extensively affected by the shape of the profiled sheeting, the pre-compressing force acting perpendicularly to the contact plane, and the horizontal forces that restrain the transversal strains of concrete. It has been shown in Abdullah and Easterling (2009) that the horizontal shear bond depends on the geometry of the slabs, the most important parameter of which is the ratio of the shear span to the effective depth, Ls/d, otherwise defined as the slenderness.
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