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An innovative approach to determine deck pavement modulus and interfacial slip stiffness based on a composite beam model

机译：一种基于复合梁模型的确定甲板路面模量和界面滑动刚度的创新方法

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摘要

Pavement modulus and shear slip stiffness are two important parameters in determining the mechanical behavior of steel deck pavement. This paper proposed a new method to estimate these two parameters based upon elasticity and composite theory. A composite beam model with incomplete shear interaction was first established, from which equations for calculating beam deflection and pavement strain were deduced in terms of pavement modulus and shear slip stiffness. The equations were solved by a numerical approach to analyze the effect of parameters on deflection and strain distribution. Analytic results indicate that the influence of pavement modulus on strain distribution along beam depth at the mid-span section is more significant than that of the interfacial shear stiffness, but within the same order of magnitude. Moreover, the slip strain increases with the reduction of pavement modulus or shear stiffness. To verify the proposed model, a bending test was conducted on a steel deck-pavement composite beam at normal temperature. Based on the proposed method, a numerical back-calculation approach—discrete search iteration approach was established with detailed flow chart. Pavement modulus and shear slip stiffness were back-calculated from the test results of displacement and strain. It shows that pavement modulus is higher when shear slip along the deck-pavement interface is considered than that when shear slip is not considered. It was further concluded that pavement strain distribution could be predicted more realistically using the slip stiffness together with the exact pavement modulus. This study improves current simulation method of the behavior of a steel deck-pavement composite structure. The exact shear stiffness calculated based on the proposed method can also provide an index for bonding evaluation.
机译：路面模量和剪切滑移刚度是确定钢甲板路面力学性能的两个重要参数。本文提出了一种基于弹性和复合理论来估计这两个参数的新方法。首先建立了一个具有不完全剪力相互作用的复合梁模型，并从路面模量和剪切滑移刚度推导了计算梁挠度和路面应变的方程。通过数值方法求解方程，以分析参数对挠度和应变分布的影响。分析结果表明，路面模量对中跨段沿梁深度的应变分布的影响比界面剪切刚度的影响更大，但幅度相同。而且，滑动应变随着路面模量或剪切刚度的降低而增加。为了验证所提出的模型，在常温下对钢甲板-路面复合梁进行了弯曲测试。在此方法的基础上，建立了带有详细流程图的数值反算方法—离散搜索迭代方法。根据位移和应变的测试结果反算了路面模量和剪切滑移刚度。结果表明，考虑沿甲板-人行道界面的剪切滑移时的路面模量比不考虑剪切滑移的路面模量高。进一步得出结论，使用滑动刚度和精确的路面模量可以更实际地预测路面应变分布。这项研究改进了目前对钢甲板-路面复合结构性能的模拟方法。基于所提出的方法计算出的精确剪切刚度还可以为粘结评估提供指标。

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  • 来源
    《Construction and Building Materials》 |2013年第3期|411-418|共8页
  • 作者

    Lei Zhang; Wenwei Wang; Qing Lu; Xianhua Chen;

  • 作者单位

    Intelligent Transport System Research Center, Southeast University, Nanjing 210096, China;

    Department of Bridge Engineering, Southeast University, Nanjing 210096, China;

    Department of Civil and Environmental Engineering, University of South Florida, Tampa, FL 33620, USA;

    Intelligent Transport System Research Center, Southeast University, Nanjing 210096, China;

  • 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

    deck pavement; modulus; slip; composite beam; asphalt concrete;

    机译：甲板路面;模量滑;复合梁沥青混凝土;

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