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SEASONAL ANALYSIS OF THE RESPONSE OF JOINTED PLAIN CONCRETE PAVEMENTS TO FWD AND TRUCK LOADS

机译:节理平面混凝土路面对前,后卡车荷载响应的季节分析

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摘要

A new pavement design procedure, known as the Mechanistic-Empirical Design Guide (MEPDG), is in development and incorporates new mechanistic-based models and performance prediction models. Structural response models are used to compute critical stresses, strains, and displacements in pavement systems due to traffic loads and climatic factors. These responses of the pavement structure are determined using finite element. Therefore, the MEPDG developed neural networks to reduce the necessary computational time. It is essential that the finite element models accurately depict the response of the slab to insure that calculated stress is representative of actual pavement stresses. Therefore, the focus of this study will be to develop finite element models that will be validated/calibrated from actual field strain measurements. The following study analyzes the response of a joint plain concrete pavement (JPCP) to an applied load. The response of the pavement is characterized by performing seasonal load testing on an instrumented JPCP. The load testing consists of traversing trucks with known axle loads and configurations across the pavement and performing falling weight deflectometer (FWD) testing. The effects of varying restraint conditions, temperature and moisture gradients, and load magnitudes on the measured deflections and strains are characterized. These measured deflections and strains are also used in the development and validation/calibration of finite element models. It was determined that temperature gradients at the time of FWD testing have an impact on load transfer efficiency, measured deflections, and the magnitude of the Void parameter, as well as the measured strain. An analysis of measured strains indicated the interface between the base and the slab is unbonded for the unrestrained slabs and bonded for the restrained slabs, indicating that the life of the bond might be a function of the restraint conditions. The primary factor affecting the measured deflections and strains was the slab restraint conditions.
机译:正在开发一种新的路面设计程序,称为“机械-经验设计指南”(MEPDG),该程序包含基于机械的新模型和性能预测模型。结构响应模型用于计算由于交通负荷和气候因素导致的路面系统中的临界应力,应变和位移。路面结构的这些响应是使用有限元确定的。因此,MEPDG开发了神经网络以减少必要的计算时间。至关重要的是,有限元模型必须准确地描述板的响应,以确保计算出的应力代表实际的路面应力。因此,本研究的重点将是开发有限元模型,该模型将通过实际的现场应变测量进行验证/校准。以下研究分析了联合普通混凝土路面(JPCP)对施加荷载的响应。人行道的响应特征是对装有仪表的JPCP进行季节性载荷测试。负载测试包括在人行道上具有已知车轴负载和配置的叉车,并进行落锤重量偏斜仪(FWD)测试。表征了变化的约束条件,温度和湿度梯度以及载荷大小对测得的挠度和应变的影响。这些测得的挠度和应变也用于有限元模型的开发和验证/校准中。已确定FWD测试时的温度梯度会影响载荷传递效率,测得的挠度,空隙参数的大小以及测得的应变。对测得的应变的分析表明,对于无约束板,基底和板之间的界面是未粘结的;对于受约束板,则是粘结的,这表明粘结的寿命可能是约束条件的函数。影响测量的挠度和应变的主要因素是平板约束条件。

著录项

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    McCracken Jennifer Kay;

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  • 年度 2008
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  • 原文格式 PDF
  • 正文语种 en
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