KOMPOZİT İNŞAAT
Design of composite steel and concrete structures
A composite member is a structural element made up of components of concrete and structural or cold-formed steel. These components are interconnected by a shear connection to limit the longitudinal slip between concrete and steel, as well as to prevent the separation of one component from the other. The shear connection serves as an essential interconnection that provides the necessary strength and stiffness for the concrete and steel components to function as parts of a cohesive single structural member within composite structures. The behavior observed occurs after the shear connection becomes effective following the hardening of the concrete. A composite beam, for instance, is a specific type of composite member that is primarily subjected to bending, also highlighting the versatility seen in composite slabs.
METAL DECK
Composite column
A composite member primarily subjected to compression or to both compression and bending, often referred to in the context of composite structures.
Composite slab
A composite slab utilizes profiled steel sheets that serve as permanent shuttering initially, and then work in conjunction with the hardened concrete, acting as tensile reinforcement in the finished floor. This integration contributes to the efficiency of composite slabs in construction.
Composite frame
A composite frame structure includes some or all elements being composite members, alongside other structural steel members, thereby enhancing the overall performance of composite structures.
Speed
Large areas of deck can be rapidly craned into position, with up to 400m2 of composite slabs laid by a single team each day. With minimal mesh reinforcement and pumped concrete, the completed floor can follow quickly, streamlining the entire construction process.
THE BENEFITS OF COMPOSITE FLOOR DECKING
Once laid, the deck acts as a safe working platform for all following trades, allowing for the elimination of temporary props. The deck also serves as lateral restraint to the beams, functioning as a diaphragm that transmits wind loads from the outer steelwork to the core. Hence, once the decking is fixed, it plays a crucial role in enhancing the stability of composite structures.
Furthermore, due to the intrinsic efficiency of composite construction, especially with composite beams and composite slabs, considerably less concrete is utilized compared to conventional reinforced concrete methods. This efficiency significantly reduces both the primary structure and the foundations.
ADVANTAGES OF COMPOSITE BEAMS
ADVANTAGES OF COMPOSITE SYSTEM
The advantages of composite beams compared with standard steelwork beams include increased moment capacity and stiffness, or alternatively, reduced steel sizes for the same moment capacity. Beyond material savings, the reduced construction depth of composite structures can be particularly beneficial in multi-storey frames. However, a key disadvantage of composite construction is the requirement for shear connectors to facilitate the interaction of the various parts.
Composite beam construction offers several advantages over non-composite construction, especially when paired with composite slabs, enhancing the overall performance of composite structures.
1- Savings in steel weight for composite beams are typically 30% to 50% compared to non-composite beams.
2- The greater stiffness of composite structures means that beams can be shallower for the same span, leading to lower storey heights and savings in cladding and other materials.
Additionally, composite slabs contribute to the advantage of rapid construction.
In buildings, composite beams are generally designed to be simply-supported. This approach simplifies the design process, reduces the complexity of beam-to-column connections, and minimizes the amount of slab reinforcement and shear connectors needed to develop continuity at the ultimate limit state.
1- Savings in steel weight for composite beams are typically 30% to 50% compared to non-composite beams.
2- The greater stiffness of composite structures means that beams can be shallower for the same span, leading to lower storey heights and savings in cladding and other materials.
Additionally, composite slabs contribute to the advantage of rapid construction.
In buildings, composite beams are generally designed to be simply-supported. This approach simplifies the design process, reduces the complexity of beam-to-column connections, and minimizes the amount of slab reinforcement and shear connectors needed to develop continuity at the ultimate limit state.