Efficiency of Riveted Joints:

Due to the rivet holes drilled in the joining plates, the original strength of the full plate section is reduced. The efficiency (η) of a riveted joint is given by the following expression:

Efficiency of the joint (η) = Least strength of riveted joint/ Strength of solid plate ×100

Example

Design a riveted connection for an angle ISA 60 × 40 × 6, connected by the longer leg to a gusset plate 6 mm thick using 16 mm dia power driven shop rivets and carrying a tensile force of 45 kN.

Figure

Solution

Gross diameter of rivet = 16 + 1.5 = 17.5 mm (Eq. )

Maximum permissible stresses in power-driven shop rivet (Table 2)

 Shear (τ_vf)      = 100 MPa

Bearing on rivet (σ_pt) = 300 MPa

Bearing on connected part = 1.2 f_y.

Minimum pitch of rivets = 2.5 ×17.5 ≈ 44 mm, → provided 45 mm

Minimum edge distance (Table 1) = 29 mm, → provided 30 mm

Single shear value of rivets = π/4 × (17.5)² ×100 = 24053 N

Bearing resistance of rivet = 6 × 17.5 × 300 = 31500 N

∴ Take the lower value 24053 N

Tensile force = 45000 N

∴ Number of rivets required = 45000/24053 = 1.87

∴ Provide 2 rivets in the same line as shown in Figure.