scholarly journals Two dimensional nonlinear site response analyses

1992 ◽  
Vol 25 (3) ◽  
pp. 222-229
Author(s):  
Tam Larkin ◽  
John Marsh
Keyword(s):  
Material Properties ◽  
Site Response ◽  
Two Dimensional ◽  
Ground Response ◽  
One Dimensional ◽  
Nonlinear Site Response ◽  
Seismic Site Response ◽  
Ground Conditions ◽  
Alluvial Material ◽  
Computer Studies

This paper presents the results of computer studies of the seismic site response of two dimensional alluvial valleys with a variety of geometries and material properties. The alluvial material is modelled as a nonlinear hysteretic solid and results are presented to illustrate the effect of material nonlinearity on surface ground response. Comparative studies with one dimensional analyses are presented and conclusions drawn as to ground conditions that are appropriate to one dimensional site analyses.

Simulation-based site amplification model for shallow bedrock sites in Korea

2021 ◽  
pp. 875529302098198
Author(s):  
Muhammad Aaqib ◽  
Duhee Park ◽  
Muhammad Bilal Adeel ◽  
Youssef M A Hashash ◽  
Okan Ilhan
Keyword(s):  
Linear Models ◽  
Site Response ◽  
Site Amplification ◽  
One Dimensional ◽  
Nonlinear Component ◽  
Nonlinear Site Response ◽  
Simulation Based ◽  
Linear And Nonlinear ◽  
Input Motion ◽  
Nonlinear Components

A new simulation-based site amplification model for shallow sites with thickness less than 30 m in Korea is developed. The site amplification model consists of linear and nonlinear components that are developed from one-dimensional linear and nonlinear site response analyses. A suite of measured shear wave velocity profiles is used to develop corresponding randomized profiles. A VS30 scaled linear amplification model and a model dependent on both VS30 and site period are developed. The proposed linear models compare well with the amplification equations developed for the western United States (WUS) at short periods but show a distinct curved bump between 0.1 and 0.5 s that corresponds to the range of site natural periods of shallow sites. The response at periods longer than 0.5 s is demonstrated to be lower than those of the WUS models. The functional form widely used in both WUS and central and eastern North America (CENA), for the nonlinear component of the site amplification model, is employed in this study. The slope of the proposed nonlinear component with respect to the input motion intensity is demonstrated to be higher than those of both the WUS and CENA models, particularly for soft sites with VS30 < 300 m/s and at periods shorter than 0.2 s. The nonlinear component deviates from the models for generic sites even at low ground motion intensities. The comparisons highlight the uniqueness of the amplification characteristics of shallow sites that a generic site amplification model is unable to capture.

Evaluation of one-dimensional seismic site response due to liquefiable sub-layer

2020 ◽  
Vol 173 (2) ◽  
pp. 133-152 ◽  
Author(s):  
Mohammad Adampira ◽  
Mehdi Derakhshandi ◽  
Abbas Ghalandarzadeh ◽  
Hossein Javaheri Koupaei
Keyword(s):  
Site Response ◽  
One Dimensional ◽  
Seismic Site Response

Predicting Solute Transport in Soil Water Flow with Estimated, Effective Material Properties

2021 ◽  
Author(s):  
Lukas Riedel ◽  
Hannes Helmut Bauser ◽  
Robert Maiwald ◽  
Santiago Ospina De Los Ríos
Keyword(s):  
Solute Transport ◽  
Soil Water ◽  
Water Flow ◽  
Material Properties ◽  
Hydrological Process ◽  
Two Dimensional ◽  
One Dimensional ◽  
Solute Fluxes ◽  
Soil Water Flow ◽  
Soil Hydraulic

&lt;div&gt; &lt;div&gt;Soil water flow is a key hydrological process supporting several ecosystem services. The non-linear soil hydraulic material properties have a profound influence on the flow dynamics and cannot be measured directly. They can be estimated with data assimilation based on measurements of the soil hydraulic state. As soils feature a multi-scale architecture, these measurements typically cannot resolve the soil heterogeneity on the relevant spatial and estimating it becomes difficult. In a previous study, we estimated a one-dimensional effective representation of a synthetic, two-dimensional, heterogeneous domain based on a vertical measurement profile using an ensemble Kalman filter. The estimated one-dimensional model represented the dynamics of the soil water movement sufficiently well, but it remained unclear if these results can be transferred to associated physical processes.&lt;/div&gt; &lt;br&gt;&lt;div&gt;Soil water flow also transports solutes between surface and groundwater. The accurate description of solute fluxes and concentrations is crucial for predicting groundwater quality and contamination. In this study, we use the aforementioned estimated, one-dimensional representation of the domain to simulate and forecast passive solute transport within the soil water flow. We examine its predictive capabilities by comparing these results with results obtained from the two-dimensional, heterogeneous synthetic truth from which artificial measurements are extracted.&lt;/div&gt; &lt;/div&gt;

scholarly journals A two-dimensional study on the weak-motion seismic response of the Aburra Valley, Medellin, Colombia

2002 ◽  
Vol 35 (1) ◽  
pp. 17-41 ◽  
Author(s):  
Brian M. Adams ◽  
Juan Diego Jaramillo
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Seismic Response ◽  
Site Response ◽  
Poor Correlation ◽  
Two Dimensional ◽  
Specific Detail ◽  
One Dimensional ◽  
Finite Element Software ◽  
Element Method

A two-dimensional elastic finite-element method is used to investigate the weak-motion seismic response of the Aburra Valley of Medellin, Colombia. A vertically propagating anti- plane SH Ricker wavelet is used to study the response of the valley for frequencies up to 5 Hz. The Aburra Valley is very large and geologically diverse. The -1200-metre-deep and -15- kilometre-wide valley is covered by a variable layer of soft soils averaging some 30 metres deep. The soils are mainly residual, alluvial or debris-flow deposits. The valley also contains a network of 24 strong-motion seismic recorders. A 49,900-element mesh of a cross-sectional model through the southern end of Medellin is analysed using the finite-element software package, Archimedes. The results are presented in both time and frequency domains. A similar one-dimensional finite-element method is used for comparison. It is found that while amplification often occurs at frequencies defined by a one-dimensional analysis, the level of amplification is often highly dependent on multi-dimensional effects. Local irregularities in the stratigraphy and topography at some sites have a significant effect on the seismic response. Site response may also be influenced strongly by sub-valley structures up to a few kilometres across, yet the influence of the valley as a whole is small. Poor correlation between modelling results and recorded data is probably due to a lack of site-specific detail within the model, and the limiting two-dimensional nature of the analysis.

Sign in / Sign up

Export Citation Format

Share Document