铁道标准设计2026，Vol.70Issue(8)：64-72,9.DOI:10.13238/j.issn.1004-2954.202411180004
高铁矮塔斜拉桥索梁锚固结构的传力机理研究
Research on Force Transmission Mechanism of Cable-Girder Anchorage Structure of a Low-Tower Cable-Stayed Bridge for a High-Speed Railway
摘要
Abstract
[Objective]To investigate the stress state and cable force transmission mechanism in the anchorage zone of the main girder segment under maximum cable force in a high-speed railway cable-stayed bridge,and to analyze the load distribution on anchor-block-web and anchor-block-flange interfaces,as well as the effects of inner transverse diaphragms and under-anchor reinforcement.[Methods]Using MIDAS/FEA,a finite element model of the main girder segment under maximum cable force and its anchorage zone was established based on a high-speed railway cable-stayed bridge.The"load transfer ratio"index was introduced to quantify load distribution on the two contact interfaces.The influences of inner transverse diaphragms and under-anchor reinforcement on force transfer were also studied.[Results]Minor stress concentrations occurred in the anchor plate(68.6 MPa)and embedded duct(94.6 MPa).Due to additional bending moment,a relatively critical stress concentration appeared at the short inclined side of the concrete anchor block.The cable force was smoothly transferred from the anchor plate to the anchor block,and then to the main girder via the web and flange interfaces.As cable inclination increased,the longitudinal load ratio on the anchor-block-web interface rose from 35.7％to 44.3％,and the vertical ratio from 58.9％to 63.5％.Inner transverse diaphragms reduced the tensile stress at the web-anchor block tip by 2～4 MPa.Under-anchor reinforcement reduced the stress non-uniformity coefficient by about 10％,improving stress distribution,while its diameter and spacing(within conventional ranges)had no significant effect on the structural stress state.[Conclusion]Design of the anchorage zone should address stress concentrations at the anchor plate,embedded duct,and short inclined side of the anchor block.Inner transverse diaphragms can effectively relieve local tension,and proper under-anchor reinforcement can enhance stress uniformity and structural safety.Larger cable inclination increases the load transferred through the anchor-block-web interface.关键词
铁路桥梁/混凝土锚固结构/应力状态/荷载传递/锚下钢筋Key words
railway bridge/concrete anchorage structure/stress state/load transfer/under-anchor rein-forcement分类
交通工程引用本文复制引用
朱泽众,曹振杰,傅青松,张迅..高铁矮塔斜拉桥索梁锚固结构的传力机理研究[J].铁道标准设计,2026,70(8):64-72,9.基金项目
国家自然科学基金项目(52478470) （52478470）
