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A generic structural pounding model using numerically exact displacement proportional damping

机译：使用数值精确位移比例阻尼的通用结构碰撞模型

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摘要

Pounding damage in bridges and buildings range from minor aesthetic effects up to major structural damage inducing building collapse or bridge girder's unseating. This study proposes the Hunt-Crossley model, a generic model that can have either a linear or nonlinear force-deformation relationship, for the analysis of building pounding. This model has been extensively employed in Mechanical Engineering. There are several approximate solutions for the damping of the model and one of them has been introduced as the 'Hertzdamp' model for structural pounding analysis. The exact solution of damping constant for this model has been presented here. The performance of the linear and nonlinear Hunt-Crossley models in simulating impact force between concrete bodies is compared against other existing pounding models, namely: linear viscoelastic, nonlinear viscoelastic and modified linear viscoelastic models. The nonlinear Hunt-Crossley model best predicted the contact force while the linear Hunt-Crossley model had twice the normalized error of the Hertzdamp model, which was still only half as much as the error in other three models. Finally, a numerical simulation of pounding of bridge segments at an expansion joint is conducted with all models. It was observed that the pounding force predictions from Hunt-Crossley models are similar to that obtained in impact experiments while other models produced very different force developments. The Hunt-Crossley models do not have the discontinuities i.e. negative force, instantaneously high initial force or discontinuous transition between deformation and restitution phases of impact which are present in the other models.
机译：桥梁和建筑物的严重破坏范围从轻微的美学影响到导致建筑物倒塌或桥梁大梁不稳固的主要结构破坏。这项研究提出了Hunt-Crossley模型，该模型可以具有线性或非线性力-变形关系，以用于分析建筑震荡。该模型已在机械工程中广泛使用。对于模型的阻尼，有几种近似的解决方案，其中一种已作为结构冲击分析的“ Hertzdamp”模型引入。此处给出了该模型的阻尼常数的精确解。将线性和非线性Hunt-Crossley模型在模拟混凝土主体之间的冲击力方面的性能与其他现有的冲击模型（即线性粘弹性，非线性粘弹性和改进的线性粘弹性模型）进行了比较。非线性Hunt-Crossley模型能最好地预测接触力，而线性Hunt-Crossley模型的归一化误差是Hertzdamp模型的两倍，仍仅为其他三个模型的一半。最后，对所有模型的膨胀节桥段的冲击进行了数值模拟。观察到，Hunt-Crossley模型的冲击力预测与冲击实验中的预测结果相似，而其他模型产生的力变化却非常不同。 Hunt-Crossley模型不存在不连续性，即其他模型中不存在负力，瞬时高初始力或变形和恢复阶段之间的不连续过渡。

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  • 来源
    《Engineering Structures》 |2014年第3期|33-41|共9页
  • 作者

    S. Khatiwada; N. Chouw; J.W. Butterworth;

  • 作者单位

    Department of Civil and Environmental Engineering, The University of Auckland, New Zealand;

    Department of Civil and Environmental Engineering, The University of Auckland, New Zealand;

    Department of Civil and Environmental Engineering, The University of Auckland, New Zealand;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Structural pounding; Hertz contact law; Hunt-Crossley model; Impact force;

    机译：结构冲击;赫兹联系法;Hunt-Crossley模型;冲击力;

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