7.1Tension members: Single angles
EN 1993‑1‑1
6.2.3
For angles in tension connected through one leg, BS EN 199311, 6.2.3(5) refers to BS EN 199318, 3.10.3. However the Eurocode does not cover the case of more than one bolt in the direction perpendicular to the applied load. Therefore the resistance has been calculated using expressions from BS 59501 for angles bolted and welded through one leg. The resistance is independent of the number of bolts along the angle and their spacing. Tables only give values for the crosssectional check; see AD351^{[}^{17}^{]} for more information.
6.2.3(2)
The value of the design resistance to tension N_{t,Rd }_{ }has been calculated as follows:
where:
A_{eq} 
is the equivalent tension area of the angle 
f_{y} 
is the yield strength 
γ_{M0} 
is the partial factor for resistance of cross sections (γ_{M0} = 1.0, as given in the National Annex). 
The equivalent tension area of the section A_{eq} is given by:
For bolted sections:
For welded sections:
where:
A_{e} 
= a_{e1} + a_{e2} 
but A_{e} ≤ 1.2 (a_{n1} + a_{n2}) 
a_{e1} 
= K_{e} a_{n1} 
but a_{e1} ≤ a_{1} 
a_{e2} 
= K_{e} a_{n2} 
but a_{e2} ≤ a_{2} 
K_{e} 
= 1.2 
for grade S275 

= 1.1 
for grade S355 
a_{n1} 
= a_{1}  n_{bolts} d_{0}t 
a_{1} 
= h x t if the long leg is connected 

= b x t if the short leg is connected 
n_{bolts} 
is the number of bolts across the angle 
d_{0} 
is the diameter of the hole 
a_{n2} 
= a_{2} 
a_{2} 
= A – a_{1} 
A 
is the gross area of a single angle. 
Note: A block tearing check (BS EN 199318, 3.10.2) is also required for tension members. However, block tearing resistances have not been tabulated, as there are too many variables in the possible bolt arrangements.