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首页> 外文期刊>Journal of Infrastructure Systems >Reduction of Impulse-Response Data on Rigid Pavement: Comparison of Single Degree of Freedom, Cone, and Lumped Parameter Dynamic Models
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Reduction of Impulse-Response Data on Rigid Pavement: Comparison of Single Degree of Freedom, Cone, and Lumped Parameter Dynamic Models

机译：刚性路面上冲激响应数据的减少：单自由度，圆锥体和集总参数动态模型的比较

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The Impulse Response (IR) method is a nondestructive method that has been successfully used to detect voids or loss of support underneath rigid pavement and to evaluate the pavement subgrade. Voids or loss of support can be detected due to changes in the pavement's mobility spectra, while the subgrade is evaluated based on the static stiffness. The fundamental assumption of the IR method is that the response of rigid pavements can be represented by a single degree of freedom (SDOF) system, with the controlling stiffness being that of the subgrade. Although simple to analyze, this oversimplification of a complex dynamic problem introduces deficiencies that are primarily attributed to a deviation of the shape of the impedance function for rigid pavement systems from that of an SDOF system for frequencies beyond the fundamental frequency. Other dynamic models [i.e., cone and lumped parameter (LP)] are investigated as alternatives to the SDOF model and are implemented in the reduction of field data collected with the Seismic Pavement Analyzer (SPA). These alternative models with additional degrees of freedom provide a significantly better representation of the effect of individual pavement layers and the subgrade on the overall pavement response, and a better fit to the pavement dynamic response curve. In general, the SDOF model results in a higher modulus compared to the cone and lumped parameter models. However, no consistent trend was established between the moduli from the different models, especially when there is a loss of pavement support or void underneath the pavement. Part of the field data used in the analysis came from a grouting program to repair a rigid pavement with voids underneath the slabs. The IR method was successfully used to evaluate support conditions before and after grouting and to determine the effectiveness of the program. (C) 2015 American Society of Civil Engineers.
机译：脉冲响应（IR）方法是一种非破坏性方法，已成功用于检测刚性路面下的空隙或支撑物损失并评估路面路基。由于路面流动性谱的变化，可以检测到空隙或失去支撑，而路基则根据静态刚度进行评估。 IR方法的基本假设是，刚性路面的响应可以由单自由度（SDOF）系统表示，控制刚度是路基的刚度。尽管分析起来很简单，但是对复杂的动态问题的这种过分简化带来了一些缺陷，这些缺陷主要归因于刚性路面系统的阻抗函数的形状与SDOF系统的阻抗函数相比，其频率超出了基本频率。研究了其他动态模型[即圆锥和集总参数（LP）]，作为SDOF模型的替代方案，并在减少通过地震路面分析仪（SPA）收集的现场数据中实现。这些具有附加自由度的替代模型可以显着更好地表示各个路面层和路基对整体路面响应的影响，并且可以更好地拟合路面动态响应曲线。通常，与圆锥和集总参数模型相比，SDOF模型的模量更高。但是，在不同模型的模量之间没有建立一致的趋势，特别是当路面支撑损失或路面下方空隙时。分析中使用的部分现场数据来自灌浆程序，该程序用于修复板下方有空隙的刚性路面。 IR方法已成功用于评估灌浆前后的支撑条件，并确定了程序的有效性。 （C）2015年美国土木工程师学会。

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    《Journal of Infrastructure Systems》 |2015年第4期|04015006.1-04015006.9|共9页
  • 作者

    Jackson Hudson; Gucunski Nenad;

  • 作者单位

    US Coast Guard Acad, Dept Civil Engn, New London, CT 06320 USA;

    Rutgers State Univ, Dept Civil Engn, Piscataway, NJ 08068 USA;

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