Guyon's formula expresses the transfer length of a prestressing tendon as a function of both the initial prestress and the draw-in. A modification of Guyon's formula is proposed which can take into account not only constant and linear behavior but also any nonlinear bond stress distribution over the transfer length. Two other nonlinear equations based on a nonlinear bond stress-slip behavior are also developed. These equations provide alternative methods for calculating the transfer length of prestressing strand.
