基于随机腐蚀坑的鞍座内钢丝极限承载力分析  

Analysis of ultimate bearing capacity of steel wires inside saddle based on random corrosion pits

作　　者：柳晨阳 LIU Chenyang(China Railway SIYUAN Survey and Design Group Co.,Ltd,Wuhan 430063)

机构地区：[1]中铁第四勘察设计院集团有限公司桥梁院,武汉430063

出　　处：《铁道勘测与设计》2024年第4期34-38,共5页Railway Survey and Design

摘　　要：作为悬索桥的关键承载结构,鞍座内主缆钢丝处于纵向拉力、钢丝间接触应力、钢丝与鞍槽间接触应力、摩擦力等复杂的多向应力状态。同时,桥位环境产生的腐蚀作用对鞍座内钢丝的几何形貌和力学性能均有一定的退化作用。因此,有必要综合考虑复杂应力状态及腐蚀作用对钢丝极限承载力的影响。针对这一特点,基于1860MPa级高强钢丝加速腐蚀实验数据,建立不同腐蚀度下腐蚀坑随机分布的钢丝几何模型,分析复杂应力状态下鞍座内腐蚀钢丝的破坏模式和极限承载力,为鞍座内腐蚀钢丝的工作性能提供依据。As the key bearing structure of suspension bridge,the main cable steel wire in saddle is in a complex multi-directional stress state,such as longitudinal tension,contact stress between steel wires,contact stress between steel wire and saddle groove,friction and so on.At the same time,the corrosion caused by the bridge environment has a certain degradation effect on the geometric morphology and mechanical properties of the steel wire in the saddle.Therefore,it is necessary to comprehensively consider the influence of complex stress state and corrosion on the ultimate bearing capacity of steel wire.According to this characteristic,based on the accelerated corrosion test data of 1860MPa high-strength steel wire,the steel wire geometric model with random distribution of corrosion pits under different corrosion degrees is established,and the failure mode and ultimate bearing capacity of corroded steel wire in saddle under complex stress state are analyzed,so as to provide basis for the working performance of corroded steel wire in saddle.

关 键 词：悬索桥 钢丝 复杂应力 腐蚀 极限承载力 

分 类 号：TG1[金属学及工艺—金属学]