首页|大跨度双联连续钢管混凝土拱桥结构体系设计研究

大跨度双联连续钢管混凝土拱桥结构体系设计研究

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为研究大跨度双联连续钢管混凝土拱桥的合理结构体系及中央拱座合理刚度,以主跨2×405 m渝湘复线双堡特大桥为背景,采用MIDAS Civil软件建立全桥有限元模型,分析考虑自重、汽车荷载和基础沉降作用下,拱桥刚接、铰接、半刚性连接约束体系和不同中央拱座刚度对桥梁力学性能的影响.结果表明:自重、汽车荷载和基础沉降作用下各结构体系力学性能均满足规范要求.双刚接方案拱肋变形对称,结构受力良好,且构造简单、施工方便.中央拱座刚度从0.8EI(EI为原设计方案中央拱座截面刚度)增加至2.0EI,自重产生的最大变形基本不变,最大拉应力减小了 0.33％,最大压应力减小了0.47％,结构力学性能改善效果不明显.双堡特大桥结构体系推荐采用双刚性连接,中央拱座合理刚度取值为0.8EI,全桥有限元计算结果表明,该结构体系的强度、刚度、稳定性均满足规范要求.
Design of Long-Span Arch Bridge with Two Continuous Concrete-Filled Steel Tubular Arches
The study in this paper focuses on the effective structural configuration and stiffness of central arch seat of the long-span arch bridge with two continuous concrete-filled steel tubular arches.The Shuangbao Bridge,which carries a section of the Chongqing-Hunan Expressway and has two main spans of 405 m,is used as a case.A finite element model of the full bridge was developed in MIDAS Civil to analyze the effects of different restraint systems and central arch seat stiffness on the mechanical property of the bridge under the action of self-weight,vehicle loads and foundation settlement,specifically rigid connection,hinged connection and semi-rigid connection.It is shown that the mechanical property of the bridge with different structural systems meet the code requirements under the action of self-weight,vehicle loads and foundation settlement.With two locations of rigid connection,the arches show symmetrical deformation and sound load bearing capacity,which also features the simplified structural configuration and ease-of-construction.When the stiffness of the central arch seat increases from 0.8EI to 2.0EI(EI refers to the cross-sectional stiffness of central arch seat in the original design scheme),the deformation of the structure induced by self-weight show negligible change,the maximum tensile and compressive stresses are reduced by 0.33％and 0.47％,respectively,leading to minor improvement of the mechanical property of the structure.In the Shuangbao Bridge,a dual-rigid-connection is applied,the stiffness of the central arch seat draws a value of 0.8EI.The numerical calculation demonstrates that the strength,rigidity and stability of the structural system meet the code requirements.

concrete-filled steel tubular arch bridgetwo continuous archesstructural systemcentral arch seatrestraint systemeffective stiffnessfinite element method

周倩、冯鹏程、胡立飞、周武召、徐建涛

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山地城市智能道路检测重庆市高校工程中心,重庆 400072

中交第二公路勘察设计研究院有限公司,湖北武汉 430056

重庆渝湘复线高速公路有限公司,重庆 401147

钢管混凝土拱桥 双联连续 结构体系 中央拱座 约束体系 合理刚度 有限元法

重庆市自然科学基金面上项目重庆市建设科技项目Construction Science and Technology Plan Project of Chongqing

CSTB2022NSCQ-MSX0661城科字2023第1-10号2023 1-10

2024

10.20052/j.issn.1671-7767.2024.02.015

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(2)
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