适用于超高强钢丝缆索的新型主缆锚具设计研究

Design of the main cable sockets for ultra-high strength steel wire cables

随着悬索桥跨径的增大,主缆钢丝的强度等级不断提高,对锚具的合理设计也提出了更高的要求。本文对主缆锚具的现有设计方法进行了介绍。基于2200 MPa级超高强钢丝缆索,对主缆锚具的材料、结构形式与外形尺寸开展初步设计,提出了新型主缆锚具的设计方案。采用有限元方法建立锚具的精细有限元模型,对设计方案的受力性能进行了数值模拟与参数分析。结果表明新型主缆锚具受力合理,设计方案可行,锚具壁厚、摩擦系数对锚具应力水平的影响最为明显,并据此提出了锚具的建议优化设计方向。

With an increase of the span of suspension bridges,the strength grade of main cable steel wires is continuously improved,which also puts forward higher requirements for the rational design of sockets.This paper first introduces the existing design methods of the main cable sockets.Then,based on the 2200 MPa grade ultra-high strength steel wire cables,the material,structural form,and dimensions of the main cable sockets are preliminarily designed,where a design scheme for the new main cable socket is proposed.The finite element method is used to establish the refined finite element models of sockets,and numerical simulation and parameter analysis of the mechanical performance of the design scheme are conducted.The results show that the stress state of the new main cable socket is reasonable,and the design scheme is feasible.The wall thickness of sockets and the friction coefficient have the most obvious influence on the stress level of sockets,and the recommended optimization design direction of sockets is proposed accordingly.