Abstract
Prestressed cable is widely applied in various long-span prestressed spatial structures as a high-efficiency tension member. Prestressed cable easily suffers prestress loss under high temperature, and this condition results in the progressive collapse of the entire structure. This study aims to investigate the temperature dependency of properties of prestressed cables and the influence laws of twisting on cable components. Static tensile test under and after high temperatures and load creep test under high temperature were carried out using high-strength steel wires (1860 MPa) and 1 × 7Φ5 spiral strands (1860 MPa) to determine the influences of temperature on the mechanical properties and twisting of cables. Results demonstrate that the mechanical properties of cables decrease considerably when the temperature exceeds 300 °C, and the residual performance of cables deteriorate considerably after 400 °C. The twisting process improves the mechanical properties of cables under high temperature. The proposed method can predict the mechanical properties and residual performance of cables accurately. The creep process was simulated by ABAQUS, and a method for effective simulation of creep behavior of cables was proposed. The prediction method was put forward in consideration of temperature and stress. In conclusion, 300 °C is the creep boundary because of lattice deformation.
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