Splices in shear in slip-resistant connection

This is a selected chapter from book Component-based finite element design of steel connections by prof. Wald et al. The chapter is focused on verification of preloaded bolts.

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. 5.6.1. The parameter is bolt diameter; see Fig. 5.6.1.

Tab. 5.6.1 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

Parameter Analytical Model (AM)CBFEM AM/ CBFEM
Diam.DistancesResist. [kN]Critical componentResist. [kN]Critical component 
M16p = 55 e= 40211Slip205Slip1,03
M20p = 70 e1= 50329Slip320Slip1,03
M24p = 80 e= 60474Slip457Slip1,04
M27p = 90 e= 70617Slip594Slip1,04
M30p = 100 e1 = 75754Slip727Slip1,04

Fig. 5.6.1 Sensitivity study for the bolt diameter

The results of sensitivity studies are summarized in the graph in Fig. 5.6.2. The results show that the differences between the two calculation methods are below 5 %. Analytical model gives generally higher resistance.

Fig. 5.6.2 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 e= 50 mm, p = 70 mm

Two splices

  • Steel S235
  • Plate 240×200×20 mm

Outputs

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

Fig. 5.6.3 Benchmark example of the bolted splices in shear

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