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首页> 外文期刊>Journal of bridge engineering >Evaluation of Drilled Shaft Capacity Using Embedded Sensors and Statnamic Testing
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Evaluation of Drilled Shaft Capacity Using Embedded Sensors and Statnamic Testing

机译：使用嵌入式传感器和静态测试评估钻探井的能力

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摘要

This paper presents an application of the embedded data collector (EDC) approach using strain and acceleration measurements at the top and bottom of a pile (drilled shaft) during dynamic loading (Statnamic) for estimation of static side and tip resistance. For assessment of the skin friction, wave propagation along the pile was modeled as a one-dimensional (1D) wave equation with nonlinear static skin friction and viscous damping. The soil-pile system was divided into segments, and each segment was characterized with independent multilinear skin friction. The skin friction of each segment was determined by least-squares fitting of computed particle velocities to the measured data at the top and bottom of the pile. For assessment of the tip resistance, the pile tip was modeled as a singledegree-of-freedom nonlinear system. A nonlinear stiffness-displacement relationship was determined by balancing force and energy from inertia, damping, and stiffness against the measured tip data. The technique was applied to a side- and tip-grouted drilled shaft 7.8 m in length with various cross sections (1.05-m diameter for top segment and 1.20-m diameter for bottom segment). The estimated static resistance was compared to results from top-down static compression loading and the segmental unloading point approach during Statnamic testing.
机译：本文介绍了一种嵌入式数据收集器（EDC）方法的应用，该方法在动态加载（Statnamic）期间使用桩（钻孔轴）顶部和底部的应变和加速度测量来估算静态边和端部阻力。为了评估蒙皮摩擦，将沿桩的波传播建模为具有非线性静态蒙皮摩擦和粘性阻尼的一维（1D）波动方程。将土桩系统分为多个部分，每个部分都具有独立的多线性皮肤摩擦特性。通过将计算的粒子速度与桩顶部和底部的测量数据进行最小二乘拟合，确定每个部分的皮肤摩擦力。为了评估尖端阻力，将桩尖端建模为单自由度非线性系统。通过平衡来自惯性，阻尼和刚度的力和能量与测得的尖端数据来确定非线性刚度-位移关系。该技术被应用于长度为7.8 m的侧面和尖端注浆的钻探井筒，井筒具有各种横截面（顶部段直径为1.05 m，底部段直径为1.20 m）。在Statnamic测试期间，将估计的静态电阻与自上而下的静态压缩加载和分段卸载点方法的结果进行比较。

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  • 来源
    《Journal of bridge engineering》 |2016年第11期|04016075.1-04016075.13|共13页
  • 作者

    Tran Khiem T.; McVay Michael; Trung Dung Nguyen; Wasman Scott J.;

  • 作者单位

    Clarkson Univ, Dept Civil & Environm Engn, Potsdam, NY 13699 USA;

    Univ Florida, Dept Civil & Coastal Engn, 365 Weil Hall, Gainesville, FL 32611 USA;

    Clarkson Univ, Dept Civil & Environm Engn, Potsdam, NY 13699 USA;

    Univ Florida, Dept Civil & Coastal Engn, 365 Weil Hall, Gainesville, FL 32611 USA;

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