This verification is carried out by comparing the resistance against tensile failure, 
, with the maximum value of the tensile force acting on the nail, 
. Specifically, the factor of safety against this mechanism is given by:
|
|
(15) |
The expression for calculating the resistance against tensile failure, 
, takes the following form:
|
|
(16) |
In which dc is the diameter of the tensile-resistant part of the reinforcement, while 
defines the tensile strength of the material composing the reinforcement.
Similar to the check against pullout, this check is performed for each phase, for each of the nails installed up to the considered phase.