Bolt shear resistance

Normal bolts

Shear bolt resistance for normal bolts per shear plane F_v,Rd and bearing resistance F_b,Rd is calculated according to the EN 1993-1-8, Art 3.6.1, Table 3.4. In SCIA Engineer it is always assumed that the shear plane passes through the threaded portion of the bolt (A is the tensile stress area of the bolt A_s, therefore α_v is based on the bolt class).

For more info on calculation of joint shear force resistance with normal bolts see chapter: "Normal bolts".

Preloaded bolts

Slip resistance of a preloaded bolts is calculated according to EN 1993-1-8 Art 3.9.1 and 3.9.2 in case combined tension and shear effect.

In SCIA Engineer it is assumed, that bolts are placed in normal holes. Therefore, based on table 3.6, the coefficient k_s is always equal to 1.

For more info on calculation of joint shear force resistance with preloadedl bolts see chapter: "Preloaded bolts".

According to the Note in EN 1993-1-8, Art. 3.4.2 (1): If preload is not explicitly used in the design calculations for slip resistances but is required for execution purposes or as a quality measure (e.g. for durability) then the level of preload can be specified in the National Annex.

There is a possibility to define this coefficient in the NA setup dialog for part EN 1993-1-8, to be used in the calculation of preloading force F_p,C .