Nested Lumped-Parameter Model for Foundation with Strongly Frequency-dependent Impedance

作者：Wang, Jue; Zhou, Ding^*; Liu, Weiqing; Wang, Shuguang

来源：Journal of Earthquake Engineering, 2016, 20(6): 975-991.

DOI：10.1080/13632469.2015.1109568

• Soil-Structure Interaction
• Lumped-Parameter Model
• Impedance Function
• Flexibility Function
• Complex Chebyshev Polynomial
• Nested Division

A nested lumped-parameter model (LPM) consisting of frequency-independent springs and dashpots is proposed to represent the foundation-soil dynamic system with strongly frequency-dependent impedance in time domain. Due to the convergence and robustness of the complex Chebyshev polynomial, it is used to approximate the dynamic flexibility of the foundation by least-square curve-fitting technique. The comparisons with existing LPMs show that the present model can express the impedance by using a small number of elements and reduce oscillation of the solution appearing in simple polynomial approximations. Finally, several examples of foundations with irregular geometries are presented to show the application of nested LPMs.

• 出版日期2016
• 单位南京工业大学