Modelling of the hysteretic bending behavior for helical strands under multi-axial loads

摘要

The nonlinearity of bending stiffness caused by inter-wire slippage has become the major challenge in the prediction of strand bending behavior. This paper proposed an analytical approach to predict the hysteretic bending behavior of helical strands. As an extension of classical models, this paper additionally considered the wire slippage delayed by bending load. Moreover, the method of integral for discrete contact regions extended the always assumed continuous contact region into the discontinuous, which enables this model to analyze the realistic conditions of multi-layered strands having alternating algebraic signs of lay angles, such as ACSR conductors and S32 cable. The present model is compared with FEM and experimental data, and results demonstrated the effectiveness of this model in strand bending prediction.