Y

Punching shear resistance

Sp,Rd - 0,6 n dm tpfu / yM2

No check needed

Combined shear and tension

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1) The bearing resistance AbRd for bolts

- in oversized holes is 0,8 times the bearing resistance for bolts in normal holes.

- in slotted holes, where the longitudinal axis of the slotted hole is perpendicular to the direction of the force transfer, is 0,6 times the bearing resistance for bolts in round, normal holes.

2) For countersunk bolt:

- the bearing resistance AbRd should be based on a plate thickness t equal to the thickness of the connected plate minus half the depth of the countersinking.

- for the determination of the tension resistance AtRd the angle and depth of countersinking should conform with 2.8 Reference Standards: Group 4, otherwise the tension resistance AtRd should be adjusted accordingly.

3) When the load on a bolt is not parallel to the edge, the bearing resistance may be verified separately for the bolt load components parallel and normal to the end.

3.6.2 Injection bolts 3.6.2.1 General

(1) Injection bolts may be used as an alternative to ordinary bolts and rivets for category A, B and C connections specified in 3.4.

(2) Fabrication and erection details for injection bolts are given in 2.8 Reference Standards: Group 7.

3.6.2.2 Design resistance

(1) The design method given in 3.6.2.2(2) to 3.6.2.2(6) should be used for connections with injection bolts of class 8.8 or 10.9. Bolt assemblies should conform with the requirements given in 2.8 Reference Standards: Group 4, but see 3.6.2.2(3) for when preloaded bolts are used.

(2) The design ultimate shear load of any bolt in a Category A connection shall not exceed the smaller of the following: the design shear resistance of the bolt as obtained from 3.6 and 3.7; the design bearing resistance of the resin as obtained from 3.6.2.2(5).

(3) Preloaded injection bolts should be used for category B and C connections, for which preloaded bolt assemblies in accordance with 3.1.2(1) should be used.

(4) The design serviceability shear load of any bolt in a category B connection and the design ultimate shear load of any bolt in a category C connection shall not exceed the design slip resistance of the bolt as obtained from 3.9 at the relevant limit state plus the design bearing resistance of the resin as obtained from 3.6.2.2(5) at the relevant limit state. In addition the design ultimate shear load of a bolt in a category B or C connection shall not exceed either the design shear resistance of the bolt as obtained from 3.6, nor the design bearing resistance of the bolt as obtained from 3.6 and 3.7.

(5) The design bearing resistance of the resin, Fb,Rd.resm, may be determined according to the following equation:

kt ks d th,resin fh,fesin

0 0

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