Connection Type - Beam-Column - Assumptions for Calculations - Eurocode 3 (EN 1993-1-8:2005)

Calculations are performed for the following internal forces:

• longitudinal force Nb,Ed
• shear force Vb,Ed
• bending moment Mb,Ed

Internal forces are reduced to the center of gravity of either the group of bolts or the group of welds connecting an element (angle, plate) with the beam to the value:

• Mb,Ed longitudinal force
• Vb,Ed shear force
• M0 = Mb,Ed + Vb,Ed * e of bending moment

For a bolted connection:

• e - the distance from the center of gravity of the group of bolts to the center of the column flange (connection with the column flange)
• e - the distance from the center of gravity of the group of bolts to the center of the column web (connection with the column web)

For a welded connection:

• e - the distance from the center of gravity of the group of welds to the center of the column flange (connection with the column flange)
• e - the distance from the center of gravity of the group of welds to the center of the column web (connection with the column web)

As a connection is verified, the software checks the resistance of parts included in the connection:

• Bolts [Table 3.14]
  • tension resistance
  • shear resistance
  • bearing pressure resistance
• Connection resistance due to forces acting on bolts [3.12]
  • bolts connecting the element (angle, plate, support seats, stiffeners of beam flanges) with the beam
  • bolts connecting the angle with the column
• Beam [3.10.2]
  • Resistance of the beam web due to block tearing
• Connecting elements [3.10.2]
  • angle resistance due to block tearing
  • plate resistance due to block tearing
• Welds [4.5.3]
  • resistance of a weld connecting the plate with the beam
  • resistance of a weld connecting the plate with the column flange
  • resistance of a weld connecting the angle with the column
  • resistance of a weld connecting the angle with the beam
  • resistance of a weld connecting the upper support seat with the column and the beam
  • resistance of a weld connecting the lower support seat with the column and the beam

Plate connection

• Bolts that connect the plate to the beam transfer the longitudinal force Nb,Ed, shear force Vb,Ed, and moment M0.
• Welds that connect the plate to the beam transfer the longitudinal force Nb,Ed, shear force Vb,Ed, and moment M0. If you select Plate on both sides, the set of forces is split by half between welds of plates.
• Welds that connect the column to the plate transfer the longitudinal force Nb,Ed, shear force Vb,Ed, and moment My. If you select Plate on both sides, the set of forces is split by half between welds of plates.

Angle connection

(Angle connected by bolts to the column and the beam)

• Bolts that connect the angle to the beam transfer the longitudinal force Nb,Ed, shear force Vb,Ed, and moment M0.
• Bolts that connect the angle to the column transfer half the longitudinal force Nb,Ed, shear force Vb,Ed, and moment M0. The moment M0 is changed to a pair of forces on the arm equal to the distance between 2 extreme bolts positioned vertically (for bolts positioned horizontally, the moment is not taken into account).

(Angle connected by welds to the column and the beam)

• The forces Nb,Ed and Vb,Ed and moment M0 are split by half between welds of angles that connect angles to the beam.
• Welds that connect the angle to the column transfer half the longitudinal force Nb,Ed, shear force Vb,Ed, and moment M0.

Connection by means of support seats

• The longitudinal force Nb,Ed is split by half between the upper and the lower support seats. For a bolted connection, it is transferred by bolts that connect the support seat to the beam (bolt shear) and bolts that connect the column to the support seat (pull-out of bolts). For a welded connection, it is transferred by welds.
• The bending moment My is changed to a pair of forces of the value F,Ed = Mb,Ed / hb (where hb = beam section height). These forces are transferred by bolts that connect support seats to the beam (pull-out of bolts) and bolts that connect the column to the support seat (pull-out of bolts).
• The shear force Vb,Ed is split by half between bolts that connect support seats to the column for a bolted connection. For a welded connection, the shear force Vb,Ed is transferred by welds.

Connection by means of angles and support seats

• The longitudinal force Nb,Ed is split uniformly among all connecting elements (upper support seat, angle, lower support seat). Its value equals F,Ed = Nb,Ed / 2 and is transferred either by bolts or by welds (depending on selected fasteners).
• The bending moment Mb,Ed is changed to a pair of forces of the value F,Ed = Mb,Ed / hb and is transferred by support seats.
• Bolts (or welds) that connect the angle to the beam transfer the shear force Vb,Ed and the bending moment M0 = Vb,Ed * e (where e = distance between the center of gravity of the group of bolts / welds of the angle and the edge of the column flange).
• Bolts / welds that connect the angle to the column transfer half the shear force.

Connection by means of plates and support seats

• The longitudinal force Nb,Ed is split uniformly among all connecting elements (upper support seat, angle, lower support seat). Its value equals F = F / 3 and is transferred either by bolts or by welds (depending on selected fasteners).

• · The bending moment My is changed to a pair of forces of the value F = My / h and is transferred by support seats.

• Bolts (or welds) that connect the plate to the beam transfer the shear force Vb,Ed and the bending moment M0 = Vb,Ed * e (where e = distance between the center of gravity of the group of bolts / welds of the plate and the center of the principal beam web).
• Welds that connect the plate to the column transfer the shear force Vb,Ed (when Plate on one side is selected) or half the force (when Plate on both sides is selected).

Connection by means of plates and stiffeners of beam flanges

• The longitudinal force Nb,Ed is split uniformly among all connecting elements (upper stiffener, angle, lower stiffener). Its value equals F,Ed = Nb,Ed / 2.
• The bending moment Mb,Ed is changed to a pair of forces of the value FEd = Mb,Ed / hb and is transferred by stiffeners of beam flanges.
• Bolts (or welds) that connect the plate to the beam transfer the shear force Vb,Ed and the bending moment M0 = Vb,Ed * e (where e = distance between the center of gravity of the group of bolts / welds of the angle and the column flange).
• Welds that connect the plate to the column transfer the shear force Vb,Ed (when Plate on one side is selected) or half the force Vb,Ed (when Plate on both sides is selected).

Connection by means of angles and stiffeners of beam flanges

• The longitudinal force Nb,Ed is split uniformly among all connecting elements (upper stiffener, angle, lower stiffener). Its value equals F,Ed = Nb,Ed / 2 and is transferred either by bolts or by welds (depending on selected fasteners).
• The bending moment Mb,Ed is changed to a pair of forces of the value F,Ed = Mb,Ed / hb and is transferred by stiffeners of beam flanges.
• Bolts (or welds) that connect the angle to the beam transfer the shear force Vb,Ed and the bending moment M0 = Vb,Ed * e (where e = distance between the center of gravity of the group of bolts / welds of the angle and the edge of the column flange).
• Bolts (or welds) that connect the angle to the column transfer half the shear force.