市政技术2026，Vol.44Issue(8)：77-88,12.DOI:10.19922/j.1009-7767.2026.08.077
下承式提篮拱桥吊杆损伤静力行为研究
Study on Static Behavior of Hangers of Through-type Basket-handle Arch Bridge Under Hanger Damage
摘要
Abstract
As the core load-bearing components of arch bridges,the mechanical condition monitoring of hangers is of vital importance.Taking a through-type basket-handle arch bridge as the research background,a full-bridge finite element model is established by MIDAS/Civil 2021.The area reduction method is adopted to simulate different dam-age degrees(5％～20％)of a single hanger under dead load.The influence laws of single-hanger damage on internal forces of adjacent hangers,deflection and internal forces of the main girder are systematically investigated.The re-sults show that damage of a single hanger ranging from 5％to 20％leads to an obvious M-shaped redistribution trend of internal forces,and the internal forces of adjacent hangers increase significantly.The vertical deflection variation of the longitudinal girder at the hanger anchorage position can effectively identify the damage location and quantify the damage degree.Among the internal-force indexes of the main girder,the bending moment of the longitudinal girder at anchorage is far more sensitive to damage than shear force and torque.For short hangers near arch spring-ings,when the damage degree falls within 15％～20％,the bending moment and deflection of the longitudinal girder at anchorage produce remarkable nonlinear mutation,presenting an obvious critical effect.It is concluded that the variation of bending moment and vertical deflection of the longitudinal girder at anchorage can be taken as core in-dexes for hanger damage identification,and the response extreme values induced by 15％～20％damage can serve as important thresholds for early safety warning of this type of bridges.The research findings reveal the response mechanism of hanger damage for through-type basket-handle arch bridges,and provide scientific references for bridge health monitoring and precise maintenance.关键词
下承式提篮拱桥/损伤识别/吊杆内力/静力行为Key words
through-type basket-handle arch bridge/damage identification/hanger internal force/static behavior分类
交通工程引用本文复制引用
谢天琪,焦驰宇,李金鑫,应伟强,李兴宇,吕向红..下承式提篮拱桥吊杆损伤静力行为研究[J].市政技术,2026,44(8):77-88,12.基金项目
国家自然科学基金资助项目(52078023,52378472) （52078023,52378472）
北京市自然科学基金-北京市教委联合重点项目(23JH0014) （23JH0014）
