查看更多>>摘要：? 2022 Elsevier LtdIn order to ensure the anti-slip safety of main cable in the main saddle of long-span suspension bridge, contact and slip behaviors of main cable of the long-span suspension bridge were investigated in this study. Mechanical characteristics of main cable were explored according to statics theory. Finite element models were established to analyze effects of pretension, applied load and coefficient of friction on stress distributions, contact statuses and slip characteristics of strands/wires along arc contact paths in the saddle. A friction and slip test rig was developed to explore slip characteristics between strands and saddle in order to validate finite element models. The results show that there are micro slips at both ends and adhesion in the central region along the arc contact paths between strand/steel wire and saddle in all cases. The micro slips decrease with increasing pretension and coefficient of friction, and increase with increasing applied load. The strand and steel wire at the lower layer exhibit the easier gross slip and the larger difference between axial stresses at both ends as compared to those at the upper layer. The axial stress difference of strand increases with increasing pretension and coefficient of friction, respectively. The friction and slip tests show that the upper layer strand exhibits the larger maximum displacement amplitude corresponding to gross slip, and the tangential force increment of strand along the arc contact path decrease in the order: tight end, central location and loose end, which validates finite element models.
NSTL
Elsevier