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首页> 外文期刊>Transportation Research Record >Linear and Nonlinear Backcalculation for Site 1 in Hanover, New Hampshire
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Linear and Nonlinear Backcalculation for Site 1 in Hanover, New Hampshire

机译：新罕布什尔州汉诺威的站点1的线性和非线性反计算

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Site 1 in Hanover, New Hampshire, is a test section with surface deflection, stress, and strain measurements. The data are used to perform linear and nonlinear backcalculation of pavement layer moduli and material parameters from the deflection bowls. The data show clearly that the pavement response is nonlinear and the following trends are observed: (a) the base material stiffens relative to the sub-grade as the load increases and (b) the upper subgrade becomes softer as the load increases. The procedures and material characterization for linear and nonlinear analyses are presented. The nonlinear one uses an axisymmetric finite element program to compute displacements, stresses, and strains. The results of the backcalculation (using deflection bowls only) show better fit of the surface deflections with the nonlinear than with the linear approach. The linear procedure seems to introduce a systematic error in the fit. The nonlinear approach predicts a distribution of moduli in the structure that is acceptable from an engineering point of view. With the parameters obtained from backcalculation, displacements and stresses are computed and compared with the measured ones. It seems that the computed response differs from the measured one by a factor of about 1.5. The prediction of stresses and strains is slightly better with the nonlinear than with the linear procedure.
机译：新罕布什尔州汉诺威的站点1是一个测试区域，具有表面变形，应力和应变测量。数据用于对偏转层的路面层模量和材料参数进行线性和非线性反算。数据清楚地表明，路面响应是非线性的，并观察到以下趋势：（a）随着荷载的增加，基础材料相对于路基变硬；（b）随着荷载的增加，上层路基变得更软。介绍了线性和非线性分析的程序和材料表征。非线性程序使用轴对称有限元程序来计算位移，应力和应变。反算的结果（仅使用偏转碗）显示，与线性方法相比，非线性方法更适合表面变形。线性过程似乎在拟合中引入系统误差。非线性方法可预测结构上的模量分布，从工程角度来看是可以接受的。利用从反算中获得的参数，可以计算位移和应力并将其与测量值进行比较。似乎计算得到的响应与测得的响应相差约1.5倍。非线性方法的应力和应变的预测要好于线性方法。

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