斜拉桥易损性及极限承载力分析  

Analysis of vulnerability and ultimate bearing capacity of cable-stayed bridges

作　　者：彭莹莹 Peng Yingying(Anhui Jiangong Road Port Construction Group Co.,Ltd.,Hefei Anhui 230001,China)

机构地区：[1]安徽建工路港建设集团有限公司,安徽合肥230001

出　　处：《山西建筑》2025年第3期154-157,共4页Shanxi Architecture

摘　　要：以某独塔斜拉桥为研究对象,基于拉索的参数振动理论,计算分析了拉索的基频、拉索在单对断索损伤场景下的拉索应力传递系数和主梁应力安全系数;采用Pareto多目标评价方法,按结构最小损伤比例造成性能残余强度最小的优化原则,研究单对断索损伤场景下拉索的易损性,确定了易损的拉索次序和拉索对结构极限承载力的影响。分析结果表明:该斜拉桥外侧拉索更容易发生参数共振;单对拉索损伤场景下,易损拉索为主跨的Z6,Z8,Z9索;边跨单对拉索断裂对结构极限承载力影响在2%以内,主跨拉索Z6发生断裂使结构极限承载力降低14.5%。研究结果可为研究独塔斜拉桥拉索易损薄弱部位,桥梁健康监测的关键索号选取和提高结构安全性提供理论依据和参考。Based on the parametric vibration theory of the cable,the fundamental frequency of the cable,the stress trans-fer coefficient of the cable and the stress safety factor of the main beam are calculated and analyzed in a single pail cable-stayed bridge.Using Pareto multi-objective evaluation method,according to the optimization principle that the minimum damage ratio of the structure causes the minimum residual strength,the vulnerability of the cable under the single pair of broken cable damage scenario is studied,and the vulnerable cable order and the influence of the cable on the ultimate bearing capacity of the structure are determined.The results show that the outer cable of the cable-stayed bridge is more prone to parametric resonance.The Z6,z8,and z9 cables of the main span are vulnerable in the single pair cable damage scenario.The effect of single pair of side span cable fracture on the ultimate bearing capacity of the structure is less than 2%,and the fracture of main span cable Z6 reduces the ultimate bearing capacity of the structure by 14.5%.The re-search results can provide theoretical basis and reference for the study of vulnerable and weak parts of the cables of single-tower cable-stayed Bridges,the selection of key cable numbers for bridge health monitoring and the improvement of struc-tural safety.

关 键 词：独塔斜拉桥 结构易损性 参数共振 断索 极限承载力 结构健康监测 

分 类 号：TU997[建筑科学—市政工程] U441[建筑科学—桥梁与隧道工程]