Scientific Quarterly Journal of Iranian Association of Engineering Geology

Scientific Quarterly Journal of Iranian Association of Engineering Geology

Improving the performance of absorbing layers with increasing damping in the numerical modeling of surface waves propagation using finite element method

Document Type : Original Article

Authors
Sohrab Mirassi 1
Hossein Rahnema 2
1 Assistant Professor, Department of Civil Engineering, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran.
2 Assistant Professor, Department of Civil and Environmental Engineering, Shiraz University of Technology, Shiraz, Iran
Abstract
Finite Element codes (FE) are increasingly used to simulate the propagation of elastic waves and dispersion, especially in surface-wave techniques. The common problem when using such methods is unwanted reflections from the boundaries of the model, which is still a challenging issue. In this paper, the effect of different parameters is evaluated to improve the performance of Absorbing Layers using Increasing Damping (ALID) in order to reduce the reflected waves from the boundaries and increase the resolution of the results. In this regard, after identifying the appropriate specifications of ALID layers in Abaqus software, the effect of thickness and number of ALID layers in different soils media with shear wave velocities of 200, 800 and 2000 m / s are investigated on the amplitude damping of incident waves at the boundaries. The results show that applying ALID with the gradual increasing damping significantly prevents the reflection of the waves into the media in comparison with the constant and double increasing damping. Furthermore, the hard soil requires more ALID layers and soft soil including high damping needs lower ALID layers. also increasing the number of ALID layers are more effective than increasing their thickness.
Keywords
Reflected waves
ALID
Absorbing Layers using Increasing Damping
Absorbing boundary
Finite Element
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Scientific Quarterly Journal of Iranian Association of Engineering Geology
Volume 13, Issue 2
Summer 2020
Pages 13-26

  • Receive Date 17 June 2019
  • Revise Date 10 December 2019
  • Accept Date 12 January 2020