STRESS ANALYSIS FOR FRR COLUMN WITH TWISTED CORD

Abstract

Since FRR undergoes larger deformation than FRP, the twisted cords, which are made of nylon, aramid, steel and so on, have been used in FRR structures to improve the fatigue properties.
In this paper, the tensile modulus of FRR column with a twisted cord is analyzed first by neglecting the effect of rubber and then by Finite Element Analysis (FEA) with the consideration of stresses and strains of both cord and rubber. In particular, the effects of the pitch length of the twisted cord and the rubber modulus of the tensile stiffness of the FRR column is studied theoretically and experimentally.
Good correlations are obtained among the FEA and the experimental results for the tensile modulus of a FRR column. Analytical results is higher than these results.