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Analytical moment-rotation curves for rigid foundations based on a Winkler model

机译：基于Winkler模型的刚性基础弯矩-旋转曲线

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摘要

Analytical equations for the moment-rotation response of a rigid foundation on a Winkler soil model are presented. An equation is derived for the uplift-yield condition and is combined with equations for uplift- and yield-only conditions to enable the definition of the entire static moment-rotation response. The results obtained from the developed model show that the inverse of the factor of safety, χ, has a significant effect on the moment-rotation curve. The value of χ = 0.5 not only determines whether uplift or yield occurs first but also defines the condition of the maximum moment-rotation response of the footing. A Winkler model is developed based on the derived equations and is used to analyze the TRISEE experiments. The computed moment-rotation response agrees well with the experimental results when the subgrade modulus is estimated using the unload-reload stiffness from static plate load-deformation tests. A comparison with the recommended NEHRP guidelines based on the FEMA 273/274 documents shows that the choice of value of the effective shear modulus significantly affected the comparison.
机译：提出了一个基于温克勒土壤模型的刚性基础弯矩-旋转响应的解析方程。推导了一个关于屈服屈服条件的方程，并与一个仅针对举升和屈服条件的方程相结合，以定义整个静态力矩-旋转响应。从已开发的模型获得的结果表明，安全系数χ的倒数对力矩-旋转曲线有显着影响。 χ= 0.5的值不仅确定首先发生隆起还是屈服，还定义了立足的最大力矩-旋转响应的条件。基于导出的方程式开发了Winkler模型，并将其用于分析TRISEE实验。当使用静态板载荷-变形试验的卸载-再加载刚度估算路基模量时，计算出的力矩-旋转响应与实验结果非常吻合。与基于FEMA 273/274文档的推荐NEHRP指南进行的比较表明，有效剪切模量值的选择会显着影响比较。

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