Research PaperNo Access

Dynamic Response of 3D Surface/Embedded Rigid Foundations of Arbitrary Shapes on Multi-Layered Soils in Time Domain

State Key Laboratory of Subtropical Building Science, South China Institute of Geotechnical Engineering, South China University of Technology, 510641, China

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Mi Zhou

State Key Laboratory of Subtropical Building Science, South China Institute of Geotechnical Engineering, South China University of Technology, 510641, China

E-mail Address: zhoumi@scut.edu.cn

Corresponding author.

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Xiaowen Zhou

State Key Laboratory of Subtropical Building Science, South China Institute of Geotechnical Engineering, South China University of Technology, 510641, China

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, and

Linqing Yang

School of Architectural Engineering, Tianhe College of Guangdong Polytechnic Normal University, Guangzhou 510641, China

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https://doi.org/10.1142/S0219455419501062Cited by:8 (Source: Crossref)

Abstract

Significant differences between the predicted and measured dynamic response of 3D rigid foundations on multi-layered soils in the time domain were identified due to the existence of uncertainties, which makes the issue a complicated one. In this study, a numerical method was developed to determine the dynamic responses of 3D rigid surfaces and embedded foundations of arbitrary shapes that are bonded to a multi-layered soil in the time domain. First, the dynamic stiffness matrices of the rigid foundations in the frequency domain are calculated via integral domain transformation. Secondly, a dynamic stiffness equation for rigid foundations in the time domain is established via the mixed variables formulation, which is based on the discrete dynamic stiffness matrices in the frequency domain. The proposed method can be applied to the treatment of systems with multiple degrees of freedom without losing the true information that concerns the coupling characteristics. Numerical examples are presented to demonstrate the accuracy of the proposed method for predicting the horizontal, vertical, rocking, and torsional vibrations. Further, a parametric study was carried out to provide insight into the dynamic behavior of the soil–foundation interaction (SFI) while considering soil nonhomogeneity. The results indicate that the elastic modulus of the soil has a significant impact on the dynamic responses of the rigid foundation. Finally, a numerical example of a rigid foundation resting on a six-layered, semi-infinite soil demonstrates that the proposed method can be used to deal with multi-layered media in the time domain in a relatively easy way.

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