单桩纵向非线性响应的简化分析模型

The Simplified Analysis Model about Vertical Nonlinear Responses of Single Pile

在Winkler地基梁模型的基础上,提出了一个新的、研究单桩纵向非线性响应的一维简化分析模型.其中,采用随深度均匀分布的纵向非线性弹簧,模拟地基土对桩轴的纵向非线性作用力,非线性弹簧恢复力采用描述迟滞非线性材料本构关系的Bouc-Wen模型.计算结果表明,该简化模型可以较好地模拟各种单桩纵向非线性响应问题,反映了单桩纵向非线性行为的主要特征,能够揭示材料非线性因素对单桩轴向响应的影响.

Based on the Beam - on - Winkler- Foundation model, a newer simplified analysis model which can be truthfully reflect the main characteristics of the vertical nonlinear responds of the single pile is put forward. In the paper, the vertical nonlinear acting force of the soil to the pile shift is sinulated with the vertical nonlinear springs which have the continuous distribution, while the nonlinear springs restoring foree adopt the Bouc- Wen model which described the constitutive relation of the hysteretic nonlinear material. The predicted result show that the simplified model can simulate the vertical nonlinear responses of single pile effectively, refleeting the main traits of the vertical nonlinear behaviors of single pile, and shuwing the material nonlinear factors impact on the single pile＇s vertical responds.