Pavement-falling weight deflectometer interaction using dynamic finite-element analysis
Pavement-falling weight deflectometer interaction using dynamic finite-element analysis
复制标题
使用动态有限元分析的路面-落锤弯沉仪相互作用
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
K. Boddapati
中科院分区：
文献类型：
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作者：
S. Nazarian;K. Boddapati
在反算过程中使用的几乎所有线性弹性静力程序中，假定所施加的载荷具有均匀的压力分布。因此，任何落锤式弯沉仪 (FWD) 的加载系统都应设计成使传递到路面的载荷均匀。这很困难，因为前轮驱动下的压力分布也受到所测试的路面轮廓的影响。 FWD 测试通常被忽视的另一个方面是负载的动态特性。动态效应与脉冲宽度以及路基刚度的变化有关。我们进行了有限元研究，以研究这些参数对确定路面剩余寿命的重要性。确定施加的载荷会或不会在 FWD 板下产生均匀压力分布的情况。研究了板块-路面相互作用对动态挠度静态解释的影响。结果表明，负载的动态特性可能会更显着地影响远离负载测量的挠度，而板-路面相互作用可能会影响第一个传感器的挠度。还确定了从标准反算程序获得的层模量估计中的误差。本研究的结果证实，板-路面相互作用和动力效应对于柔性路面的 FWD 测试非常重要。
In almost all linear elastostatic programs used in backcalculation procedures, a uniform pressure distribution is assumed for the applied load. As such, the loading system of any falling weight deflectometer (FWD) should be designed so that the load transferred to the pavement is uniform. This is difficult because the pressure distribution under the FWD is also affected by the pavement profile being tested. The other aspect of the FWD testing that is typically ignored is the dynamic nature of the load. The dynamic effects are related to the pulse width as well as the variation in the stiffness of the subgrade. A finite-element study has been carried out to investigate the significance of these parameters on the determination of the remaining lives of pavements. Cases where the imparted load would or would not yield a uniform pressure distribution under the FWD plate are identified. An investigation of the effects of the plate-pavement interaction on the static interpretation of the dynamic deflections is presented. The results indicate that the dynamic nature of the load may more significantly affect the deflections measured away from the load, whereas the plate-pavement interaction may affect the deflection of the first sensor. The errors in the estimation of the layer moduli that would be obtained from the standard backcalculation procedures are also determined. The results of this study confirm that the plate-pavement interaction and the dynamic effects are important for the FWD test on flexible pavements.