常泰长江大桥组合索塔锚固结构钢-混传剪构造足尺模型试验研究

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中文摘要：常泰长江大桥索塔锚固结构采用钢箱-核芯混凝土组合结构,为研究该新型组合索塔锚固结构钢-混传剪构造的受力特性,进行钢-混传剪构造足尺模型试验研究.制作2个锚固结构足尺节段试验模型,通过压剪试验研究锚固结构的荷载～滑移曲线及应力、应变分布等受力特性,并通过有限元模型分析锚固结构的传力机理和各组件的内力分配比例,推导剪力钉剪力计算方法.结果表明:在2.14倍单索最大索力荷载作用下,锚固结构保持弹性状态,钢壁板未产生明显滑移,钢-混界面最大滑移不超过0.25 mm,该锚固结构中钢-混传剪构造至少具有2.14倍的安全系数;荷载作用下,剪力钉剪力从上至下逐渐增大,锚腹板附近底部3排剪力钉剪力较大,钢-混传剪构造至少存在剪力钉和界面摩擦力2种传剪机制,钢-混传剪构造的承载能力显著提高;钢-混传剪构造受力过程分为粘结力传力阶段和局部滑移阶段,剪力钉剪力分布不仅与沿剪切方向长度分布有关,也与荷载的大小线性相关.

外文标题：Full-Scale Model Test of Steel-Concrete Shear Transfer Details in Composite Cable-Pylon Anchorages of Changtai Changjiang River Bridge

外文摘要：The cable-pylon anchorage zones of Changtai Changjiang River Bridge are steel box-core concrete composite structures.This paper presents the findings of the full-scale model tests on the mechanical properties of the steel-concrete shear transfer details of the composite cable-pylon anchorage structure.Two full-scale sectional models were prepared to investigate the load-slip curves as well as stress and strain distribution in the anchorage structure via compressive shear tests.The load transfer mechanism of the anchorage structure and the internal force sharing proportion of the anchorage constituents were numerically analyzed,and the method to calculate the shear forces of shear studs was derived.It is shown that under the 2.14 times maximum tension of individual stay cables,the anchorage structure remains in elastic condition,no obvious slip of steel walls is observed,the maximum slip of steel-concrete interface is less than 0.25 mm,and the safety factor of steel-concrete shear transfer details is at least 2.14 times of the required level.Under the action of loads,the shear forces in the shear studs show sign of a top-down increase,with three rows of shear studs near the base of the anchorage webs bearing bigger shear forces.Shear studs and interface friction are the two types of shear transfer mechanisms of the steel-concrete shear transfer details,as a result,the load bearing capacity of the steel-concrete shear transfer details is significantly improved.The steel-concrete shear transfer details undergo a bonding force transfer stage and a local slip stage.The shear distribution in shear studs is not only associated with its length along the shear direction,but also linearly related to load actions.

外文关键词：

cable-stayed bridgecomposite cable-pylon anchorage structuresteel-concrete shear transfer detailsload-slip curvefull-scale model testfinite element method

作者：

赵灿晖、王康康、沈孔健、郑清刚

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作者单位：

西南交通大学桥梁工程系,四川成都 610036

江苏省交通工程建设局,江苏南京 210004

中铁大桥勘测设计院集团有限公司,湖北武汉 430056

关键词：

斜拉桥组合索塔锚固结构钢-混传剪构造荷载～滑移曲线足尺模型试验有限元法

基金：

国家重点研发计划项目四川省科技计划项目

项目编号：

2021YFB16003002022NSFSC0441

出版年：

2024

DOI：

10.20051/j.issn.1003-4722.2024.01.005

桥梁建设

中铁大桥局集团有限公司

桥梁建设

CSTPCD北大核心

影响因子：1.428

ISSN：1003-4722

年,卷(期)：2024.54(1)

参考文献量16