1D Effective Stress Site Response Analysis; Using Stress Based Pore Pressure Model and Plasticity Model | [Journal of Applied and Emerging Sciences • 2020]

Author(s):

1. Saeed-ullah Jan Mandokhail: : Department of Civil Engineering, BUITEMS, Pakistan

2. Naik Muhammad: : Department of Civil Engineering, BUITEMS, Pakistan

3. Muhammad Habib: : Department of Civil Engineering, BUITEMS, Pakistan

4. Muhammad Irfan: : Department of Civil Engineering, BUITEMS, Pakistan

5. Salah Uddin: Department of Civil Engineering, BUET, Khuzdar, Pakistan

6. Muhammad Akram: Department of Software Engineering, BUITEMS, Pakistan

Abstract:

The accumulated stress based porewater pressure (PWP) generation model is a simplified model using the concept of damage parameter. The only input of this PWP model is liquefaction resistance curve (CRR-N). The model is very useful since the CSR-N curves can be developed empirically from in-situ penetration tests measurements. In this research work the estimation of excess PWP development during seismic loading by using stress based PWP generation model is compared with a rigorous plasticity model. One dimensional (1D) effective stress nonlinear site response analyses were conducted in DEEPSOIL and Opensees using the stress based PWP model and PressureDependentMultiYield02 (PDMY2) model, respectively. The site response analysis were performed on a sand column 30 m in depth comprises of a low density liquefiable layer in between two dense non-liquefiable layers. Three bed rock outcropping motions with peak ground acceleration (PGA) level of 0.11 g, 0.124 g and 0.357 g were used as input motion in the analysis. The maximum ru profiles computed from the two models were compared and analyzed. The ru time histories at the center of the nonliquefiable layers and liquefiable layer were also compared. The comparisons revealed that the two models used in this study compute most comparable ru values. The computed ru is also found in line with density of soil and the PGA of the input ground motions where the ru increases with increase in the PGA and decreases with increasing density.

Page(s): 6-12

DOI: DOI not available

Published: Journal: Journal of Applied and Emerging Sciences , Volume: 10, Issue: 1, Year: 2020

Keywords:

Porewater Pressure Model , Effective Stress , Excess Pore Pressure Ratio , Liquefaction , Site Response

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