Potential Correlation between Corrosion-Induced Configuration Alteration and the Seismic Performance of Long-Span Cable-Stayed Bridges with Floating Systems

摘要

Based on the theory of beams on elastic foundation (TBEF), the potential correlation between corrosion-induced configuration alteration and seismic behavior of long-span cable-stayed bridges with a floating system is investigated qualitatively. Some factors associated with initial configuration of those bridges, i.e., the influence length of bending moment, critical buckling load, and buckling mode, are determined first by the energy method. The correlation of the factors with cable corrosion is then identified by using the TBEF. Through an example bridge excited by earthquakes, development of plasticity hinges and yielded cables, load-carrying capacity, and buckling resistance is studied to reveal their potential relationship with corrosion. The study indicates that corrosion in cables can alter the positions in which the first plasticity hinge and the first yielded cable occur. The development of subsequent plasticity hinges and yielded cables also has exhibited a strong relationship with cable corrosion. Corroded cables tend to cause a decrease in earthquake resistance of those bridges. Severe corrosion can possibly switch intentionally from design failure mode to undesirable bucking failure. (C) 2017 American Society of Civil Engineers.