Shear Connection Behavior in Composite Structural Systems
Summary
Composite structural systems exploit the complementary properties of steel and concrete by linking them through shear connectors that transfer longitudinal forces at the interface. The behaviour of these connections governs overall stiffness, strength and ductility, with key parameters including connector type (for example headed studs, high-strength bolts, angle profiles), embedment depth, concrete grade and connector spacing. Load transfer mechanisms involve a combination of bearing, frictional resistance and dowel action, giving rise to characteristic load–slip relationships. Experimental programmes, typically employing push-out tests, have established failure modes ranging from concrete crushing and splitting to connector fracture or weld failure. Advances in numerical modelling and refined analytical expressions have focused on capturing nonlinear interface behaviour, slip modulus degradation and the influence of cyclic loading. Optimising shear connection design not only enhances structural performance but also supports sustainable construction through demountable connectors and material reuse.
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Research from all publishers
Recent studies have extended understanding of connector performance under static loading and through advanced modelling. A comprehensive review of composite flooring systems has illustrated the effects of connector spacing, slip modulus and analytical modelling approaches on both strength and serviceability, and called for updates to design codes. Experimental and finite element investigations of high-strength bolt connectors in prefabricated composite beams have introduced new design expressions incorporating bolt pretension, concrete strength and bolt geometry, resulting in improved predictions of shear resistance. Investigations into C-shaped and L-shaped angle shear connectors through push-out testing and nonlinear finite element analysis have delineated distinct failure modes—such as weld fracture in L-shaped connectors and concrete crushing in C-shaped profiles—and proposed predictive equations for shear capacity that align closely with measured results. These works collectively highlight the interdependence of connector geometry, material properties and interface mechanics in determining composite action.
Shear Connection Behavior in Composite Structural Systems publication trend
The graph below shows the total number of articles in shear connection behavior in composite structural systems across all publications each year (not limited to Nature Index journals).
Technical terms
Shear connector: A mechanical device embedded in a concrete slab to transfer longitudinal shear forces across the steel–concrete interface.
Composite structural system: An assembly of steel and concrete elements designed to act together under load through effective interface action.
Push-out test: An experimental method in which a shear connector is loaded in shear until failure within a steel beam–concrete slab specimen to characterise load–slip response and ultimate capacity.
Slip modulus: The initial stiffness of a shear connection, defined as the ratio of applied shear force to relative slip at the interface over a specified range.
References
- Viability and performance of demountable composite connectors. Journal of Constructional Steel Research (2014).
- The evolution of composite flooring systems: applications, testing, modelling and eurocode design approaches. Journal of Constructional Steel Research (2019).
- Behavior of an Advanced Bolted Shear Connector in Prefabricated Steel-Concrete Composite Beams. Materials (2019).
- Shear Capacity of C-Shaped and L-Shaped Angle Shear Connectors. PLOS ONE (2016).
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