scholarly journals One dimensional equivalent linear ground response analysis — A case study of collapsed Margalla Tower in Islamabad during 2005 Muzaffarabad Earthquake

2016 ◽  
Vol 130 ◽  
pp. 110-117 ◽  
Author(s):  
Khalid Mahmood ◽  
Zia-ur- Rehman ◽  
Khalid Farooq ◽  
Shazim Ali Memon
Keyword(s):  
Response Analysis ◽  
Ground Response ◽  
Ground Response Analysis ◽  
One Dimensional ◽  
Equivalent Linear

scholarly journals COMPARISON OF EQUIVALENT LINEAR AND NON LINEAR METHODS ON GROUND RESPONSE ANALYSIS: CASE STUDY AT WEST BANGKA SITE

2016 ◽  
Vol 18 (1) ◽  
pp. 23
Author(s):  
Eko Rudi Iswanto ◽  
Eric Yee
Keyword(s):  
Linear Method ◽  
Response Analysis ◽  
Peak Strain ◽  
Ground Response ◽  
Ground Response Analysis ◽  
Ground Acceleration ◽  
Equivalent Linear ◽  
Non Linear ◽  
Short Time

COMPARISON OF EQUIVALENT LINEAR AND NON LINEAR METHODS ON GROUND RESPONSE ANALYSIS: CASE STUDY AT WEST BANGKA SITE. Within the framework of identifying NPP sites, site surveys are performed in West Bangka (WB), Bangka-Belitung Island Province. Ground response analysis of a potential site has been carried out using peak strain profiles and peak ground acceleration. The objective of this research is to compare Equivalent Linear (EQL) and Non Linear (NL) methods of ground response analysis on the selected NPP site (West Bangka) using DeepSoil software. Equivalent linear method is widely used because requires soil data in simple way and short time of computational process. On the other hand, non linear method is capable of representing the actual soil behaviour by considering non linear soil parameter.  The results showed that EQL method has similar trends to NL method. At surface layer, the acceleration values for EQL and NL methods are resulted as 0.425g and 0.375g respectively. NL method is more reliable in capturing higher frequencies of spectral acceleration compared to EQL method.    

scholarly journals Stochastic nonlinear ground response analysis via a case study site in Shiraz city

2021 ◽  
Vol 0 (0) ◽  
pp. 0-0
Author(s):  
Ali Johari ◽  
Amir Hossein Amjadi ◽  
Asma Heidari
Keyword(s):  
Response Analysis ◽  
Ground Response ◽  
Ground Response Analysis ◽  
Case Study Site

One-Dimensional Effective Stress Non-Masing Nonlinear Ground Response Analysis of IIT Guwahati

2017 ◽  
Vol 8 (1) ◽  
pp. 1-27 ◽  
Author(s):  
Devdeep Basu ◽  
Arindam Dey ◽  
Shiv Shankar Kumar
Keyword(s):  
Pore Water Pressure ◽  
Water Pressure ◽  
Response Analysis ◽  
Eastern Region ◽  
Seismic Zone ◽  
Ground Response ◽  
Accurate Identification ◽  
Ground Response Analysis ◽  
Soil Medium ◽  
One Dimensional

Ground response analysis (GRA) helps to assess the influence of the soil medium on the propagating shear waves and indicates about the characteristics of the waves reaching the ground surface from the bedrock level. Such a study becomes imperative for the urbanized alluvial banks of North-Eastern region of India, which is located in the highest seismic zone of the country. Conventionally, GRA is carried out based equivalent linear approach, which being a simplistic approach is unable to capture the nonlinear characteristics of saturated silty sands subjected to seismic shaking. This article presents the outcome of seismic one-dimensional nonlinear GRA of IIT Guwahati (located on a varying geology in the saturated alluvial banks of River Brahmaputra) considering pore-water pressure dissipation characteristics and non-Masing unload-reload criteria. Various ground response parameters obtained from the study helps in the accurate identification of the earthquake intensity based site amplification of the region expressed through a 2-D mapping.

Integration of Viscoplastic Effects in a One-Dimensional Constitutive Model for Ground Response Analysis

2020 ◽  
Author(s):  
Samuel Yniesta ◽  
Mallak Janati-Idrissi
Keyword(s):  
Strain Rate ◽  
Stress Component ◽  
Response Analysis ◽  
Shear Strain Rate ◽  
Ground Response ◽  
Ground Response Analysis ◽  
Strain Rate Effects ◽  
One Dimensional ◽  
Rate Effects ◽  
Modulus Reduction

During an earthquake, strain-rate effects affect both the stiffness and damping behaviour of soils, yet existing constitutive models for ground response analysis are typically formulated within a rate-independent framework. In this paper, a one-dimensional viscoplastic stress-strain model is presented to introduce strain rate effects in ground response analysis. Its constitutive equations are based on a model that uses a cubic spline fit of the modulus reduction curve and a coordinate transformation technique to match any input modulus reduction and damping curve. A viscous stress component is added to model the effect of strain rate on the mechanical behaviour of soils using a single input parameter. The model is able to reproduce the linear increase in shear strength with the logarithm of shear strain rate, and allows to introduce viscous effects in 1D ground response analysis with control over damping and modulus reduction behaviour. The model is implemented in a software for ground response analysis and used to predict the results of a centrifuge test modeling one-dimensional wave propagation. The results show that the model predicts accurately the amplification and attenuation of shear waves, in a context where strain rates impact significantly the response of the model.

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