Finite element simulation of creep of spiral strands

In the presented paper, the creep of steel spiral strands with a construction of 1 × 7 and 1 × 19 round wires subjected to constant axial loads is studied numerically. The principal aim of this contribution is to define and describe a novel design computational tool for the numerical simulation and prediction of creep strains in spiral strands. For this purpose, finite element models are developed using ANSYS software. Wires of the strands are modelled using 3D geometrically nonlinear beam elements. An approach is based on the Timoshenko beam theory and Saint Venant torsion theory. The wire material is both linearly elastic and isotropic. Creep strain of strands is caused by the creep strain of wires due to the tensile load acting on them and by extension due to the construction of the strand when the strand is tightened. The constitutive creep equations of wires and selected initial clearances between wire layers are incorporated into the finite element models. The models are set up and calibrated on the basis of data obtained by the creep tests. In principle, the required functionality and performance have been implemented in the software and a good agreement with test results has been obtained.