高强螺栓抗剪连接滑移数值模型
作者:
作者单位:

1.东南大学 土木工程学院,江苏 南京 211189;2.辽宁工程技术大学 土木工程学院,辽宁 阜新 123000

作者简介:

赵中伟(1986—),男,副教授,工学博士,主要研究方向为既有钢结构性能评估。 E-mail: zwzhao@yeah.net

通讯作者:

吴刚(1976—),男,教授,博士生导师,工学博士,主要研究方向为既有工程结构高效加固新技术。E-mail: g.wu@seu.edu.cn

基金项目:

中国博士后科学基金面上项目(2017M621156)。


Investigations on Simplified High-strength Bolt-slip Numerical Model for Shear Connection
Author:
Affiliation:

1.School of Civil Engineering, Southeast University, Nanjing 211189, China;2.School of Civil Engineering, Liaoning Technical University, Fuxin 123000, China

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    摘要:

    为了减少计算代价并提高计算结果的收敛性,提出了一种新的高强度螺栓滑移数值模型和确定非线性摩擦单元实常数的计算公式。将所提出的数值模型计算结果与已有通用有限元软件的结果进行了对比以验证所提出的数值模型的可靠性。对比结果表明所提出的高强度螺栓滑移数值模型可以精确捕捉高强度螺栓的滑移现象,用于计算摩擦单元实常数的计算公式可以精确得到高强度螺栓的滑移临界摩擦力。通过滑移模型所得滞回曲线与既有模型计算结果高度吻合且计算时间减少约90%。在此基础上,通过参数化分析对简化滑移数值模型的计算误差进行了系统研究。分析了螺栓预紧力、钢板厚度、螺栓直径以及屈服强度对计算精度的影响。结果表明所提出的简化滑移数值模型收敛性好,计算精度高,大大减小了计算代价。

    Abstract:

    A bolt-slip model was proposed for the simulation of high-strength bolted connections and the method for determining the real constant of nonlinear spring element was also put forward. The reliability of the proposed bolt-slip model was validated and the results were obtained by the proposed model and the refined FE model. The comparison results indicate that the sliding phenomenon can be well captured and the friction force with enough accuracy can be derived by the proposed bolt-slip model. Time for computing reduces by 90% with the same accuracy. In addition, the parametrical analysis was conducted to explore the computational error in different conditions. The influence of pretightening force, thickness of steel plate, bolt diameter and yield strength on accuracy of the proposed bolt-slip model were investigated. Results show that the proposed model is powerful in terms of the convergence and accuracy.

    图1 螺栓连接几何参数(单位:mm)Fig.1 Geometric parameters of the adopted specimen (unit: mm)
    图2 螺栓连接精细化数值模型Fig.2 Refined numerical model of a bolted connection
    图3 简化的螺栓滑移数值模型Fig.3 Schematic of the newly proposed bolt-slip model
    图4 接触单元的荷载位移曲线Fig.4 Force-deflection curve of the contact element
    图5 摩擦单元的荷载位移曲线Fig.5 Force-displacement curve of friction element.
    图6 简化滑移螺栓数值模型Fig.6 Simplified numerical model of the bolted connection
    图7 摩擦单元内力方向示意Fig.7 Direction of friction around the bolt hole
    图8 不同方法荷载–位移曲线对比Fig.8 Comparison of results derived by different methods
    图9 滞回曲线对比Fig.9 Comparison of hysteretic curves
    图10 不同几何尺寸下滞回曲线对比Fig.10 Comparison of hysteretic curves corresponding to different geometrical size
    图11 不同板厚所得结果的比较Fig.11 Comparison of the results derived by different thickness
    图12 不同屈服强度所得结果的比较Fig.12 Comparison of the results derived by
    图13 全螺栓隔板贯通节点数值模型Fig.13 Finite element model of fully bolted diaphragm-through connections
    图14 节点区域应力云 (单位:MPa)Fig.14 Von Mises stress of nodal domain (Unit: MPa)
    图15 不同方法所得滞回曲线对比Fig.15 Comparison of results derived by different methods
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赵中伟,樊雄涛,吴刚.高强螺栓抗剪连接滑移数值模型[J].同济大学学报(自然科学版),2020,48(12):1707~1716

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  • 收稿日期:2020-05-14
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  • 在线发布日期: 2020-12-31