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独塔斜拉-自锚式协作体系悬索桥合理约束体系研究

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为研究独塔斜拉-自锚式协作体系悬索桥合理约束体系,以主跨2×350 m的济南绕城高速二环线北环段工程黄河特大桥主桥为背景,采用BNLAS软件建立主桥空间有限元模型,对比不同纵向、竖向约束体系方案下结构的荷载响应、自振特性,分析不同塔梁约束体系对独塔斜拉-自锚式协作体系悬索桥静、动力性能的影响.结果表明:塔梁处竖向双排支座有效约束了塔梁之间的相对转动自由度,使塔梁协调受力,相较于传统的全飘浮体系和竖向单排支座体系,竖向双排支座体系提供了更大的整体结构刚度;设置纵向约束能显著增强独塔斜拉-自锚式协作体系悬索桥结构纵向刚度,建议在纵向上设置固定约束;相较于传统塔梁墩固结体系,竖向双排支座体系对主梁提供了更强的转动约束,且塔梁间约束在构造上处理简单.该桥桥塔处设置竖向双排支座并设置纵向固定限位装置.
Research on Rational Restraint System for Single-Tower,Self-Anchored,Hybrid Cable-Stayed Suspension Bridge
This study investigates the rational restraint system for the single-tower,self-anchored,hybrid cable-stayed suspension bridge.The main bridge of a Huanghe River Bridge which has two main spans of 350 m and carries a section of the north portion of the Second Ring Road connecting to Jinan Bypass Highway is used as a case.A spatial finite element model of the main bridge was established in BNLAS to compare the load responses and natural vibration properties of the bridge structure equipped with different longitudinal and vertical restraint systems.The influences of different tower-girder restraint systems on the static and dynamic performance of the single-tower suspension bridge of a cable-stayed and self-anchored combined system were analyzed.It is shown that the two rows of vertical bearings at the junction of the tower and the girder effectively restrict the relative rotation degrees of freedom between the tower and the girder,enabling the tower and the girder to collaboratively carry loads,and the bridge also gains bigger integral stiffness compared with the structure of a full-floating system and the structure with single row of bearings.It is recommended to install permanent longitudinal restraint system to improve the longitudinal stiffness of the bridge of such type.Compared with a tower-girder-pier fixity,the two rows of vertical bearings allow the bridge to have stronger rotation restriction and simplify the configuration of the tower-girder restriction.In the case bridge,two rows of vertical bearings and longitudinal restrictors are installed at the tower.

self-anchored suspension bridgesingle-tower self-anchored hybrid cable-stayed suspension systemrestraint systemstructural stiffnessload responsenatural frequencyfinite element method

殷涛、周宁杰、鬲鹏飞、提衍征

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山东高速建设管理集团有限公司,山东济南 250098

西南交通大学土木工程学院,四川成都 610031

山东省交通规划设计院集团有限公司,山东 济南 250101

自锚式悬索桥 独塔斜拉-自锚式协作体系 约束体系 结构刚度 荷载响应 自振频率 有限元法

国家重点研发计划项目

2022YFB3706702

2024

10.20052/j.issn.1671-7767.2024.05.010

世界桥梁
中铁大桥局集团有限公司

世界桥梁

CSTPCD北大核心
影响因子：0.928
ISSN：1671-7767
年,卷(期)：2024.52(5)