Code-check of bolts and preloaded bolts according to Hong Kong Code

Shear capacity

Shear capacity of preloaded bolts is determined according to Cl. 9.3.6.2 as:

$$P_{SL} = 0.9 \cdot K_s \cdot \mu \cdot P_0$$

where:

• $K_s$ – hole coefficient taken as

  • for standard holes $K_s = 1.0$
  • for oversized holes $K_s = 0.85$
  • for slotted holes $K_s = 0.7$
• $\mu$ – slip factor between connected parts from Table 9.7; editable in Code setup
• $P_0$ – minimum proof loads of bolts specified in relevant international or local standards

Combined tension and shear

Combined tension and shear is checked according to Cl. 9.3.8.2 as:

$$\frac{F_s}{P_{SL}}+\frac{F_{tot}}{0.9\cdot P_0} \le 1.0$$

where:

• $F_s$ – shear force in a bolt
• $P_{SL}$ – slip resistance of a preloaded bolt
• $F_{tot}$ – total applied tension in the bolt including the prying force
• $P_0$ – specified minimum proof load of a preloaded bolt