The following two requirements must be satisfied in order to classify a connection as nominally pinned, based on its strength: The initial rotational stiffness of the connection, calculated in accordance with BS EN, 6.3.1 is compared with the classification boundaries given in BS EN, 5.2.2.Īlternatively, joints may be classified based on experimental evidence, experience of previous satisfactory performance in similar cases or by calculations based on test evidence.

have sufficient robustness to satisfy the structural integrity requirements ( tying resistance).īS EN requires that all connections must be classified by stiffness, which is appropriate for elastic global analysis, or by strength, which is appropriate for rigid plastic global analysis, or by both stiffness and strength, which is appropriate for elastic-plastic global analysis.provide the directional restraint to members which has been assumed in the member design.Be capable of accepting the resulting rotations under the design loads.Should be capable of transmitting the internal forces, without developing significant moments which might adversely affect the members or the structure as a whole and.Joint considerations Joint classificationĪccording to BS EN, nominally pinned joints: 126 also provides useful guidance on the design of simple connections to Eurocode 3. The spacing of the fasteners comply with clause 3.5 and follow the recommendations presented in the ' Green Book' (SCI P358).ĮCCS publication No. The capacities of the connection components are based on the rules given in clause 3.6. The design of simple connections is based on BS EN and its accompanying National Annex. These are classed as special connections and are treated separately. Simple connections can also be needed for skewed joints, beams eccentric to columns and connection to column webs. Column splices (bolted cover plates or end plates).Beam-to-beam and beam-to-column connections using:.Two principle forms of simple connection (as shown on the right) are used in the UK, these being:Ĭommonly encountered simple connections include:

Stability is provided to the frame by bracing or by a steel or concrete core. This definition underlies the design of multi-storey braced frames in the UK designed as 'simple construction', in which the beams are designed as simply-supported and the columns are designed for axial load and the small moments induced by the end reactions from the beams. Therefore do not transfer significant moments at the ultimate limit state. Simple connections are nominally pinned connections that are assumed to transmit end shear only and to have negligible resistance to rotation. 10.2 Bolted 'cap and base' or 'end plate' splices for tubular and rolled I sections.10.1 Bolted cover plate splices for I sections:.7 Beam-to-beam and beam-to-column connections.

Splice plate 4 hole