In this study, a new p-y model is proposed for the seismic loading prediction of pile foundations using the Beam on Nonlinear Winkler Foundation (BNWF) method. It matches the desired modulus reduction curve by identifying three parameters in a hyperbolic function and a linear function using a genetic algorithm (GA), and the desired damping curve by applying the Ishihara-Yoshida rule that controls the unloading–reloading curves iteratively through the three parameters. The rate effect is integrated into the proposed PySimple5 model for clay by exerting influence on the ultimate capacity and maximum material damping through a power function, while the pore pressure effect is reflected in the proposed Pyliq5 model for sand by relating the ultimate capacity to the mean effective stress. For a single pile in non-liquefiable soil, the predicted superstructure acceleration and pile bending moment by PySimple5 agree well with those from centrifuge tests for different soil shear strain levels, while the equivalent linear and PySimple1 models underestimate them for soil shear strain levels higher than 1%. For a pile in liquefiable soil, PyLiq5 shows a reasonable agreement with the centrifuge tests in terms of the superstructure acceleration and pile bending moment by considering the pore pressure effect.

在这项研究中，提出了一种新的 py 模型，用于使用非线性 Winkler 地基梁 (BNWF) 方法对桩基进行地震载荷预测。它通过使用遗传算法 (GA) 识别双曲函数和线性函数中的三个参数来匹配所需的模量折减曲线，并通过应用通过三个迭代控制卸载-重载曲线的 Ishihara-Yoshida 规则来匹配所需的阻尼曲线参数。通过幂函数对极限容量和最大材料阻尼产生影响，将速率效应集成到提出的粘土 PySimple5 模型中，而通过将极限容量与平均值相关联，孔隙压力效应反映在提出的沙子 Pyliq5 模型中有效应力。对于非液化土壤中的单桩，PySimple5 预测的上部结构加速度和桩弯矩与离心机测试对不同土壤剪切应变水平的结果非常吻合，而等效线性模型和 PySimple1 模型在土壤剪切应变水平高于 1% 时低估了它们。对于液化土中的桩，考虑孔隙压力效应，PyLiq5 在上部结构加速度和桩弯矩方面与离心机试验显示出合理的一致性。