Splices in shear in slip-resistant connection

Description

This study is focused on the verification of component-based finite element method (CBFEM) for the resistance of the symmetrical double splice slip-resistant connection to an analytical model (AM).

Analytical model

The slip resistance of a preloaded bolt is designed according to chapter 3.9.1 in EN 1993-1-8:2005. The preloading force is taken at 70 % of the ultimate strength of a bolt according to equation (3.7).

Verification of resistance

Design resistances calculated by CBFEM are compared with the results of analytical model (AM); see (Wald et al. 2018). The results are summarized in Tab. 5.5.1. The parameter is bolt diameter; see Fig. 5.5.1.

\[ \textsf{\textit{\footnotesize{Drawing 5.5.1 Joint geometry and dimensions}}}\]

Tab. 5.5.1 Comparison of bolt resistance predicted by FE model to analytical one for bolt diameter; joint: splice 200/12 mm, bolts 2 × M× 8.8, plates 2 × 200/20 mm, steel S235

\[ \textsf{\textit{\footnotesize{Fig. 5.5.1 Sensitivity study for the bolt diameter}}}\]

The results of sensitivity studies are summarized in the graph in Fig. 5.5.2. The results show that the differences between the two calculation methods are below 5 %. Analytical model gives generally higher resistance.

\[ \textsf{\textit{\footnotesize{Fig. 5.5.2 Verification of CBFEM to AM for the slip-resistant double splice connection}}}\]

Benchmark example

Inputs

Connected member

• Steel S235
• Splice 200×12 mm

Connectors

Bolts

• 3 × M20 8.8
• Distances e₁ = 50 mm, p = 70 mm

Two splices

• Steel S235
• Plate 480×200×20 mm

Code setup

• Friction coefficient in slip-resistance 0.5

Outputs

• Design resistance F_Rd = 320 kN
• Design failure mode is slip of the bolts

\[ \textsf{\textit{\footnotesize{Fig. 5.5.3 Benchmark example of the bolted splices in shear}}}\]