A flange plate connection is a structural moment connection that uses steel plates attached to the top and bottom flanges of a beam. These plates transfer high bending moments directly into supporting columns or connecting beam sections by converting flexure into tension and compression force pairs. Shear forces are handled separately via a web connection, making this arrangement a standard choice in moment-resisting frames where rigid load paths are required.

The layout of a flange plate connection usually involves the following key elements:

• Top and Bottom Flange Plates: Plates attached to the beam flanges that carry axial tension and compression caused by bending moments.
• Web Plate or Cleat: A single or double shear plate attached to the beam web to carry shear forces.
• bulloni: Fasteners connecting the plates to the beam flanges and web, often using high-strength ASTM A325 or A490 bolts.
• saldature: Complete-joint-penetration (CJP) or fillet welds used to connect the plates to the support column or primary beam.
• Column Continuity Stiffeners: Transverse plates added inside the column flanges if column web yielding or flange bending controls.

Insieme, these components maintain joint rigidity and ensure predictable moment transfer under design loads.

Flange plate connections are widely used in structural designs that require continuity and lateral stability against wind or seismic forces:

• Moment-resisting building frames and high-rise structures.
• Field splices in long-span steel beams.
• Heavy industrial plants and equipment support structures.
• Crane runway girders and portal frames.

Using a dedicated flange plate connection calculator helps ensure all critical limit states—such as plate yielding, taglio dei bulloni, and block shear—are properly verified per AISC requirements.

Depending on erection preferences and fabrication requirements, a flange plate connection can take several forms:

• Fully Bolted Flange Plate: Plates are shop- or field-bolted to both the beam flanges and the supporting member.
• Shop-Welded, Field-Bolted Flange Plate: Flange plates are shop-welded to the column flange and bolted to the beam flange in the field.
• Fully Welded Flange Plate: Plates are welded to both the beam and the support for maximum joint rigidity.
• Beam Splice Flange Plate: Cover plates are attached across top and bottom flanges to join two beam segments continuously.

Each variation can be evaluated for capacity and economy within the SkyCiv calculator interface.

To check a flange plate connection using the calculator, provide the following parameters:

• Member Profiles: Select the beam and column section sizes (ad esempio, Forme a W).
• Dimensioni della piastra: Spessore, larghezza, and length for top, parte inferiore, e piastre web.
• Fastener & Dettagli di saldatura: Dimensione del bullone, grado, spaziatura, distanze dal bordo, or weld size and length.
• Applied Loads: Input governing bending moment ($M_x$) e forza di taglio ($V_y$) demand.
• Codice di progettazione & Metodo: Scegli AISC 360-16 under either LRFD or ASD.

Clic “calcolo” to review the utility ratios, controlling failure modes, and clear visual breakdown of your design capacity.

SkyCiv streamlines moment connection checks by automating complex AISC 360-16 formulas into a clear, visual web platform. Instead of managing complex manual calculations for tensile rupture, taglio del blocco, cuscinetto del bullone, and column web limit states, the tool gives you clear pass/fail results and printable reports in seconds.

• Calcolatore per la progettazione delle connessioni in acciaio
• Software di progettazione della connessione SkyCiv