Damage Model and Bilinear Approximation of Deteriorated Wires in Suspenders

Abstract:

Based on the mechanical properties of deteriorated wires which examined by experimental tests and FEM simulation,a new damage model and bilinear approximation of deteriorated wires in suspenders are proposed according to force-displacement envelope of deteriorated wires.The model is cumulative and capable of combining the real constitutive relations of wires,strength,stiffness,ductility,corrosion,and loading history.The new bilinear approximation of the deteriorated wires is advanced based on the exact solutions of integral method and S.M.Elachachi constitutive method.Furthermore,the damage indicator of suspender is established combined with the corrosion distribution and damage indicators of wires.Finally,the rationalization of the proposed model is validated and the sensibility of parameters is illustrated.It is found that the mechanical properties of wires degrade significantly with the corrosion and actual load history.In addition,the damage indicator of suspender is reasonable which reflects the degradation in strength,stiffness and limit strain.