Abstract
The damping system characterizes the spatial distribution of structural energy dissipation. Identifying a damping system is the premise for determining the dynamic analysis method. Concepts of nonlinear processes and non-classical damping systems are often confused without theoretical primary and experimental verification. This paper proposes an identification method of damping systems based on motion states at the interface by analyzing the correlation between the damping system and dynamic characteristics. The relationship between the change of damping system type and relative motion states at the interface is studied by investigating multiple material properties through shaking table model tests of a large-scale soil-structure interaction (SSI) system. The results show that a nonlinear system can demonstrate the characteristics of the classical damping system as soon as there is no mutation of motion states at the interface of the system. The identification method of damping system based on motion states at the interface can reflect the change of dynamical characteristics of the system under linear and nonlinear processes.
Highlights
The damping system represents the spatial distribution characteristics of the energy dissipation in a dynamic process [1]
Evaluation of soil-structure interaction (SSI) Damping System Based on Interface Motion State The pile-soil interface is the crucial point for the classification of the SSI damping system
The coordination degree of adjacent points at the interaction surface can reflect the adjusting ability of motor coordination of the interface. It can be the direct criterion for the type of damping system
Summary
The damping system represents the spatial distribution characteristics of the energy dissipation in a dynamic process [1]. A series of shaking table tests designed by Xi’an Jiaotong University shows that the natural frequency of the SSI system decays gradually in increasing dynamic loads as soon as nonlinear vibration characteristics appear [9,10] This SSI system can still transform into a unified system with coordinating motion states and show characteristics of a classical damping system even though it is composed of entirely different materials. These results indicate that the traditional identification depending on material characteristics is not completed yet, and nonlinear systems are not necessarily non-classical damping systems. They can prove the simple identification method for damping systems with different materials and in the non-linear process
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