BSF 225 kN, Bean-beam connection

The connector is designed for beam-to-beam applications. It has a maximum vertical load capacity of 225 kN and a minimum beam dimension of 190 x 370 mm. The SF 225 B-B beam-to-beam receiving unit weighs 2.10 kg.

Function and Design

The BSF 225 B-B system consists of three main components: a B 225 beam unit cast into the supported beam, an SF 225 B-B receiving unit cast into the supporting beam, and an S 225 solid steel sliding knife that transfers the load between the two beams.

During erection, the knife is retracted and protected inside the B 225 beam unit. Once the supported beam is correctly positioned, the knife is extended into the SF 225 B-B receiving unit. The load is then transferred through the steel knife and into the specified anchoring reinforcement in both precast beams.

Materials and Finish

The three principal components of the BSF 225 B-B system are manufactured from S355 steel. The threaded rods are grade 8.8, and the stop washers are manufactured from S355 steel. The recess boxes are manufactured from thin sheet steel and supplied in standard finish.

Applications

BSF 225 B-B is designed for heavy-duty connections between two precast concrete beams. The corbel-free arrangement is particularly useful where architectural appearance, clear headroom, efficient formwork and flexible beam layouts are important. Dedicated design guidance is available for cantilevered beam-to-beam connections, T-connections and two-sided T-connections.

Installation and Fire Performance

The telescopic design supports fast and safe erection because the knife remains inside the beam unit until the beam is in position. After installation, the connection can be protected by the surrounding concrete and completed in accordance with the project-specific fire-protection design. The steel components have reaction to fire Class A1 according to EN 13501-1.

Documentation and Design

Technical memos cover capacities, main dimensions, reference levels, tolerances, torsion, expansion joints, seismic design proposals, reinforcement design and installation guidance. Dedicated reinforcement guidance is available for cantilevered beam-to-beam connections, T-connections and two-sided T-connections. A BSF calculation tool is also available for structural design.

BSF products are manufactured under CE-marked production in accordance with EN 1090. The declared BSF 225 B-B vertical load capacity is 225 kN, based on minimum concrete strength class C35/45 and project-specific reinforcement design.

Design and reinforcement must be verified for both beams, the actual loads, connection geometry, tolerances and project conditions using the current technical documentation.