深水库区多塔部分斜拉桥高桩承台参数敏感性分析  

Parametric Sensitivity Analysis of High Pile Cap in Multi Tower Extradosed Cable⁃stayed Bridges in Deep Water Reservoir

作　　者：郑存笔 ZHENG Cunbi(China Railway Shanghai Design Institute Group Corporation Limited,Shanghai 200070,China)

机构地区：[1]中铁上海设计院集团有限公司,上海200070

出　　处：《铁道建筑》2025年第3期67-73,共7页Railway Engineering

基　　金：中国铁路总公司科技研究开发计划(N2022G065)。

摘　　要：为研究高速铁路部分斜拉桥高桩承台对桥梁结构整体受力的影响,以池黄(池州—黄山)高铁太平湖特大桥为工程背景,建立全桥杆系有限元模型,分析墩跨比、承台刚度、基础布置形式、墩高与自由桩长比等设计参数对桥梁整体结构受力的影响,并引入敏感因子及敏感等级对参数影响程度进行定量分析。结果表明:随着墩跨比的增大,主梁正弯矩呈线性增大,敏感因子为0.474,为弱敏感参数,对结构动力特性有一定影响。承台刚度几乎不影响上下部结构整体受力,敏感因子接近0,为不敏感参数。基础布置形式对下部结构受力影响最显著,不同基础布置下最大桥墩弯矩变化率达33.18%,桩基最大应力变化率为66.84%,桩基最小应力变化率为-65.21%,对桩基最大应力而言,敏感因子为4.367,为强敏感参数,对结构动力特性影响显著。墩高与自由桩长比对跨中挠度、拉索应力幅及桥墩正弯矩而言,敏感因子均大于0.3且小于1.0,为弱敏感参数,对桩基最大应力而言为强敏感参数。To study the influence of high pile cap of extradosed cable-stayed bridge in high speed railway on the overall stress of bridge structure,the Taiping Lake super large bridge of Chizhou-Huangshan high speed Railway was taken as the engineering background.A finite element model of the entire bridge frame system was established to analyze the influence of design parameters such as pier span ratio,cap stiffness,foundation layout,pier height to free pile length ratio on the overall structural stress of the bridge.Sensitivity factors and sensitivity levels were introduced to quantitatively analyze the degree of parameter influence.The results show that the positive bending moment of the main girder increases linearly with the increase of the pier span ratio,and the sensitive factor is 0.474,which is a weak sensitive parameter,and also has a certain influence on the dynamic characteristics of the structure.The stiffness of the cap almost does not affect the overall force of the upper and lower structure,and the sensitive factor is close to 0,which is an insensitive parameter.The type of foundation layout has the most significant influence on the stress of the substructure.Under different foundation layout,the bending moment of the bridge pier has the maximum amplitude of 33.18%,the maximum stress amplitude of pile foundation is 66.84%,and the minimum stress amplitude of pile foundation is-65.21%.The sensitive factor to the maximum stress of pile foundation is 4.367,which is a strong sensitive parameter,and has a significant influence on the dynamic characteristics of the structure.The sensitivity factors of pier height to free pile length are more than 0.3 and less than 1.0,which are weak sensitive parameters.For the maximum stress of pile foundation,it is a strongly sensitive parameter.

关 键 词：部分斜拉桥 参数敏感性 数值计算 高桩承台 结构受力 深水库区 

分 类 号：U448.13[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程]