Stahlbetonverbundbauweise

Stahlbetonverbund, or steel-concrete composite construction, refers to the structural action that occurs when steel reinforcement and concrete are designed to work together as a single material system. In this arrangement, the concrete primarily carries compressive loads while the steel resists tension, and the two materials transfer forces through a bond or connectors to achieve higher stiffness and strength than each would alone.

Full composite action is typically achieved with shear connectors or studs that physically connect the steel element to the concrete, ensuring the transfer of shear across the interface. The bond between steel and concrete can rely on adhesion, friction, and the mechanical interlock provided by these connectors. Designers account for different long-term effects such as creep, shrinkage, and corrosion risk.

Common configurations include composite beams, where a steel I-section works with a concrete slab or deck, and composite slabs on steel beams, where the concrete contributes to bending resistance and overall stiffness. In reinforced concrete with additional metal decking, the steel deck may act as formwork and provide strength in tension as well.

Design of steel-concrete composite members is governed by standards such as Eurocode 4 (EN 1994) in many regions, and by national codes aligned with ACI and AISC guidelines in others. These standards specify requirements for detailing, connectors, serviceability, and fire resistance, aiming to optimize weight, economy, and construction speed.

Stahlbetonverbund offers advantages including increased load-carrying capacity, reduced structural depth, and faster construction, but requires careful detailing and durability considerations to ensure long-term performance.