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摩擦型高强螺栓连接抗剪滑移行为研究

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为研究摩擦型高强螺栓抗剪连接的滑移行为,分析了钢结构全过程的受力和变形性能.采用简化的螺栓滑移数值计算方法,使用COMBIN39弹簧单元模拟了螺栓与盖板、芯板之间的摩擦行为以及螺杆与螺栓孔壁之间的接触挤压行为.通过ANSYS有限元软件模拟了单行四列螺栓连接抗剪滑移过程并采用试验加以验证.建模分析了三行六列螺栓群在摩擦阶段、滑移阶段和弹塑性变形阶段的连接抗剪滑移过程,总结出各行螺栓在各个阶段的传力比和芯板、盖板的应力分布规律.根据三阶段滑移过程,提出了螺栓群总滑移量的计算公式.以孔壁变形特点为依据,采用分段函数拟合出孔壁的变形-荷载曲线,并将拟合的曲线与芯板和盖板各螺栓孔壁变形平均值有限元结果进行了比对.结果表明:有限元计算的荷载-位移曲线与实测的荷载-位移曲线吻合良好,验证了有限元模型的正确性;拟合的变形-荷载曲线与有限元模拟值吻合良好;当外荷载为375 kN时,传力比最大的第1列螺栓首先开始松动,之后便出现微小滑移;当外荷载增加至905 kN时,第1列螺栓芯板位置处出现大面积塑性变形区并发生孔壁挤压破坏,可以认为芯板已经达到极限承载能力状态,但此时盖板的Von Mises应力仅为231.1 MPa,说明盖板没有进入屈服状态.研究结果可为摩擦型高强螺栓群的研究和设计提供参考.
Study on Shear-slip Behavior of Friction-type High-strength Bolt Connection
To study the slip behavior of friction-type high-strength bolt shear connection,the stress and deformation behavior of steel structure during the whole process are analyzed.The friction behavior between bolt and cover plate,core plate,and the contact extrusion behavior between bolt and borehole wall are simulated by COMBIN39 spring element.The shear-slip process of single row four-row bolted connections is simulated by ANSYS and verified by experiments.The shear-slip process of three-row six-row bolts in friction stage,slip stage and elastic-plastic deformation stage is analyzed,and the force transfer ratio and the stress distribution of core plate and cover plate of each row of bolts in each stage are summarized.Based on the three-stage slip process,a formula for calculating the total slip of bolts is proposed.Based on the deformation characteristics of the borehole wall,the deformation-load curve of the borehole wall is fitted by piecewise function,and the fitting curve is compared with the finite element result of the average deformation of the borehole wall of the core plate and the cover plate.The result shows that the load-displacement curves calculated by the finite element method are in good agreement with the measured ones,which verifies the correctness of the finite element model;The fitting deformation-load curve is in good agreement with the finite element simulation value.When the external load is 375 kN,the bolt of the first row with the largest transmission ratio begins to loosen at first,and then a small slip occurs.When the external load increases to 905 kN,a large area of plastic deformation area appears at the position of the first row of bolted core plates and the borehole wall is crushed,however,the Von Mises stress of the cover is only 231.1 MPa,indicating that the cover has not entered the yield state.The study result can provide reference for the research and design of friction-type high-strength bolt cluster.

bridge engineeringslipfinite element analysishigh-strength bolt clusterborehole wall deformationsimplified numerical model

马志贵、冀伟、武维宏

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甘肃省交通规划勘察设计院股份有限公司,甘肃 兰州 730000

湖南大学 土木工程学院,湖南 长沙 410082

桥梁工程 滑移 有限元分析 高强螺栓群 孔壁变形 简化数值模型

甘肃省科技重大专项项目甘肃省科技重大专项项目甘肃省重点研发计划工业类项目甘肃省重点人才项目兰州市人才创新创业项目

19ZD2GA00221ZD8JA00323YFGA00432020RCXM1012021-RC-39

2024

10.3969/j.issn.1002-0268.2024.07.012

公路交通科技
交通运输部公路科学研究院

公路交通科技

CSTPCD北大核心
影响因子：1.007
ISSN：1002-0268
年,卷(期)：2024.41(7)
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