1 
Weld connection 
Butt weld 
(1) in butt joints and Tjoints, butt welds perpendicular to the axial tension or axial pressure or combined butt and fillet welds (2) in the butt joint and Tjoint, the normal stress and shear stress of the butt weld or the combined butt and fillet weld under the joint action of bending moment and shear force are calculated respectively. In the place where there are large normal stress and shear stress at the same time, the reduced stress shall be calculated:


Right angle fillet weld 
(1) under the action of tension, pressure or shear force passing through the weld core: correct weld (when the force is perpendicular to the weld length direction)
Side fillet weld (when the force is parallel to the weld length direction) (2) the joint action of a and R under the combined action of other forces or various forces


Bevel fillet weld 
Calculated according to the formula of right angle fillet weld, but β = 1.0, Calculated thickness:

α is the angle between two weld legs 
Butt weld with partial penetration 
Calculated according to the formula of right angle fillet weld and under the pressure perpendicular to the weld length direction, β = 1.22 is taken, and β = 1.0 is taken for other stress conditions. Effective thickness:

S is the shortest distance from the groove root to the weld surface (without considering reinforcement) α is Vgroove angle 
2 
Bolt connection and rivet connection 
Shear connection of ordinary bolts, anchor bolts and rivets 
The design value of bearing capacity of each ordinary bolt or rivet shall be the lesser of the design value of shear and bearing capacity: Design value of shear capacity:


Axial tension connection of common bolt, anchor bolt and rivet rod 
Design value of bearing capacity of each ordinary bolt, anchor bolt or rivet:


Common bolts and rivets bear both shear and axial tension 


Friction type high strength bolt shear connection 
Design value of bearing capacity of each friction type high strength bolt


Friction type high strength bolt rod axial tension connection 
Design value of bearing capacity of each friction type high strength bolt


The friction type high strength bolt connection bears the shear force between the friction surfaces and the pull force in the direction of the rod axis at the same time 
Design value of shear capacity of each friction type high strength bolt


Pressure bearing high strength bolt shear connection 
The calculation formula is the same as that of ordinary bolt 

Pressure bearing high strength bolt compression connection 
The calculation method of bearing capacity design value of each bearing type high strength bolt is the same as that of common bolt 

Bearing type high strength bolt bears both shear force and axial tension 

