The Influence of Plasticity Index on the Dynamic Soil Behavior

 

Payman Alimohammadi

Ph.D. Student of Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor Barhu, Malaysia; e-mail:payman_alimohamadi@yahoo.com

Mahdy Khari

Ph.D. Student of Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor Barhu, Malaysia; e-mail: mehdikhari@gmail.com

Khairul Anuar Kassim*

Professor of Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor Barhu, Malaysia; e-mail: kanuar@utm.my
* Corresponding author

Azlan Adnan

Professor of Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor Barhu, Malaysia; e-mail: azlanadnan@utm.my

Ali Dehghan Banadaki

Ph.D. Student of Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor Barhu, Malaysia; e-mail: A.dehghan1916@yahoo.com

Nima Latifi

Ph.D. Student of Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor Barhu, Malaysia; e-mail: en_latifi@yahoo.com

 

 ABSTRACT

In earthquake engineering, site response analysis is a step important because the earthquake loading at the ground surface is necessary in the structural seismic performance. Dynamic soil properties such as shear modulus and damping are the most prominent factors of amplification phenomenon during earthquakes. The shear modulus degradation and damping ratio curves have been developed based on the nonlinearity soil from hysteresis loops. Plasticity index and Effective confining pressure are governing factors that affect the nonlinearity soil behavior. In this paper, the shear modulus degradation and damping ratio curves were derived from the two cases. The first of them was based on only effective confining pressure, whereas the second case was based on plasticity index and effective confining pressure. The equivalent linear method was implemented for the site response analyses of these two models. The results of this study illustrated the influence of the plasticity index on the soil shear strength and the site response.

Keywords: Plasticity Index, Effective Confining Pressure, Equivalent Linear Method, Shear wave velocity, Shear Modulus

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