Engineering Flexibility: Advanced FEM Improvements for the Ground

Newswise – Designing structures such as dams, tunnels, and bridges to withstand transient loads from sources such as earthquakes, high-speed trains, and explosions requires robust analysis of dynamic soil–structure interaction (SSI). Conventional methods often fail to handle complex boundary conditions and dynamic responses. The demand for accurate SSI solutions is growing, especially considering the influence of local soil conditions on seismic motion characteristics. Given these challenges, in-depth research on advanced numerical methods is needed to enhance the accuracy and reliability of SSI analysis.

Researchers from Kyoto University have presented a velocity-dependent finite element procedure in space and time in the International Journal of Mechanical System Dynamics. The study (DOI: 10.1002/msd2.12106) was published on June 4, 2024, and presents a systematic approach to reduce unbounded soil domains and model energy flow during seismic activities, providing a major leap forward in dynamic SSI analysis.

The study presents a velocity-based spatial-temporal finite element method (v-ST/FEM) to address dynamic SSI problems. This innovative method incorporates viscous boundary conditions based on the Lysmer-Kuhlemeyer model, effectively cutting the unbounded soil domain to prevent spurious reflections. The v-ST/FEM method accurately simulates the seismic input motion as an effective nodal force vector in the numerical simulation, ensuring the energy flow from the far domain to the computational domain. The researchers validated this approach by comparing the seismic response of a concrete gravity dam on an elastic half-space with the results of the semi-discrete finite element method (FEM) using the Newmark-β method. The v-ST/FEM method showed superior accuracy and stability in simulating long-term seismic motion, making it a reliable tool for future SSI analyses and improving the prediction of seismic performance of various structures.

Dr. Vikas Sharma, lead author of the study, emphasizes the importance of this research, saying: “Our v-ST/FEM approach provides a more accurate and computationally efficient method for dynamic soil-structure interaction problems. This advance is critical to developing infrastructure that can better withstand the forces of nature, ultimately protecting lives and property.”

The application of this research is far-reaching, especially for the design and evaluation of ground structures such as dams and bridges in seismic areas. By providing more accurate prediction of seismic soil amplification, v-ST/FEM technology can contribute to safer and more resilient infrastructure, potentially saving lives and reducing the economic impact of earthquakes.

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References

Digital Document Number

10.1002/msd2.12106

Original source link

https://doi.org/10.1002/msd2.12106

Financing Information

This work was supported by a JSPS KAKENHI Grant-in-Aid for Scientific Research (B) (Grant No. 21H02304).

About International Journal of Mechanical Systems Dynamics (IJMSD)

International Journal of Mechanical System Dynamics (IJMSD) is an open access journal that aims to systematically uncover the vital impact of mechanical system dynamics on the entire life cycle of modern industrial equipment. Mechanical systems may vary in different scales and integrate with electronic, electrical, optical, thermal, magnetic, acoustic, pneumatic, fluidic, etc. systems. The journal welcomes research and review articles on dynamics in relation to advanced theory, modeling, computation, analysis, software, design, control, manufacturing, testing, and evaluation of general mechanical systems.

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