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Intel software, Wolfram Mathematica, Origin, Statgraphics, EViews
Info e Commerciali Intel software, Wolfram Mathematica, Origin, Statgraphics, EViews
QUAKE/W 2019
Lingua: Ing S.O.: Win
Produttore: GeoSlope
  ADALTA è Importatore Unico e Distributore Ufficiale per l'Italia per i prodotti GeoSlope


QUAKE/W

 

Dynamic earthquake analysis

QUAKE/W is a powerful finite element software product for modeling earthquake liquefaction and dynamic loading. QUAKE/W determines the motion and excess pore-water pressures that arise due to earthquake shaking, blasts, or sudden impact loads.

Key Features

Dynamic Stress Analysis

QUAKE/W models dynamic stresses arising from earthquake shaking or dynamic point forces from a blast or sudden impact. QUAKE/W simulates the impact of these stresses on earth structures. 

Earthquake Records

Earthquake time history records can be imported and scaled for a dynamic analysis. Modify the peak acceleration and duration to ensure the values used in the QUAKE/W analysis represent site-specific conditions.

Newmark Analyses

The QUAKE/W computed dynamic forces can be used in SLOPE/W to compute yield accelerations and potential permanent deformations for each trial slip surface.

Excess Pore Pressure

Excess pore-pressures computed by QUAKE/W together with the initial static pore-pressures can be used in SLOPE/W to examine the effect of the elevated pore-pressures on stability.

QUAKE/W can model the dynamic behavior of almost any earth structure

Download GeoStudio to view GSZ files

Newmark Deformations

This example demonstrates how the results of a QUAKE/W analysis can be used in conjunction with SLOPE/W to estimate the permanent deformations that may occur as a result of the inertial forces associated with an earthquake. This type of permanent deformation analysis is referred to as a Newmark analysis.

Download the GeoStudio data files
Read the analysis details

Soil-Structure Interaction

The response of the ground can be influenced by the rigidity of a structure. Stated conversely, the presence of a stiff structure could possibly affect the response of the ground to earthquake shaking. This example illustrates some modeling techniques used to include the effects of a structure, including the mass of the structure, in a QUAKE/W analysis.

Download the GeoStudio data files
Read the analysis details

Upper San Fernando Dam

The San Fernando earthquake occurred in California in 1971. The earthquake created a liquefaction failure at the Lower San Fernando Dam and Reservoir. This analysis demonstrates the advantages of using QUAKE/W with other GeoStudio products to analyze the multiple issues that arose with this case.

Download the GeoStudio data files
Read the analysis details

Blast Vibrations

This example considers the dynamic response of a pit slope to a blast charge. The project file contains an equivalent linear QUAKE/W analysis as well as a SLOPE/W stability analysis.

Download the GeoStudio data files
Read the analysis details

QUAKE/W's intuitive modeling workflow

Create a QUAKE/W analysis and set up the problem workspace. Choose the analysis type, such as initial static, equivalent linear dynamic and nonlinear dynamic. Import earthquake records and desired modifiers for the dynamic analysis and define the equivalent cyclic parameters.

Draw the regions in your domain using CAD-like drawing tools, including drawing polygon and circular regions, coordinate import, copy-paste geometric items, length and angle feedback, region splitting and merging, and direct keyboard entry of coordinates, lengths, and angles. Alternatively, import AutoCAD DWG or DXF files directly into GeoStudio to create your domain geometry.

Define the material properties for your analysis, assign them to regions on the domain, and then define your initial pore-water pressure and stress conditions. Define materials using linear elastic, equivalent linear and nonlinear parameters and functions, such as pore-water pressure vs. cyclic number, Ka vs. shear stress, and more. Define the initial stress and pore-water pressure conditions for transient scenarios using results from other GeoStudio analyses, defined spatial functions or draw an initial water table.

Define stress/strain boundary conditions to simulate stress and fluid pressure conditions or displacement/force conditions to be placed on the domain. Time-varying loading functions can be defined to simulate changing conditions over the duration of a transient analysis. Structural beams and bars can also be applied to the model domain.

Open Draw Mesh Properties to refine the mesh drawn on the entire domain, or along specific geometric regions, lines or boundaries. Define history points at locations where complete records are required for all time steps included in the earthquake record. Information for all other nodes is typically saved every 10th time step.

When your problem is completely defined, start the analysis process in the Solve Manager window. The Solve Manager displays the solution progress, allowing you to cancel or stop/restart if necessary. While the solution is in progress, you can look at preliminary results in the Results window.

When the Solver is finished, the Y-total stress contours are displayed, with displacement results displayed as either a deformed mesh or vector arrows. You can display other contours, based on displacement, velocities, accelerations, total or effective stress, pore-water pressure, and more, using the Draw Contours window or add acceleration vectors. Labels can be added to contour lines in Results View. Liquefaction zones can also be viewed on the model domain.

Interactively select any node or gauss region to view result information, including resulting total stresses, displacement, pore-water pressure, material properties, and more. Draw Mohr Circles to review the stress/strain state of any node or gauss region. Display plots of computed results over the x or y-direction, create time-varying plots of results in transient analyses or view result graphs at history points, such as displacements, velocities, total or effective stresses, and more. Generate reports of the definition and results, and export into other applications such as Microsoft Excel for further analysis.

 

Complete Feature List
 

Integrated into the GeoStudio Suite

QUAKE/W is integrated into the GeoStudio suite, and therefore has access to the GeoStudio features for creating your model, analyzing it, and viewing results.


Dynamic Analysis of Earth Structures

QUAKE/W can be used to analyze earth structures subjected to earthquake shaking or dynamic point forces from a blast or a sudden impact load. QUAKE/W determines the motion and excess pore-water pressures that arise due to shaking. Therefore, it is designed primarily for assessing:

  • The stability of slopes that are subjected to inertial forces arising from earthquake shaking
  • The liquefaction potential of earth structures subjected to earthquake shaking
  • The potential permanent deformation associated with earthquake shaking

Comprehensive Formulation

QUAKE/W uses a finite element-based formulation based on direct integration in the time domain. When analyzing earth structures subjected to earthquake shaking, this means integrating a set of time intervals from the start to the end of the defined earthquake record. Alternative time intervals can be used for other dynamic analysis types.


Typical Applications

QUAKE/W can model the dynamic behavior of almost any earth structure you will encounter in your geotechnical, civil, and mining engineering projects, including:

  • Earth embankment dams
  • Natural soil and rock slopes
  • Loose ground deposits
  • Estimation of post-earthquake deformation
  • Impact loads from dynamic blasting
  • Any natural, near-horizontal ground sites with potential for excess pore water pressure generation

Constitutive Models and Material Properties

Three constitutive models are supported: Linear-Elastic, Equivalent Linear, and an effective stress Non-Linear model. The Cyclic Stress Ratio (CSR) approach is used for calculating excess pore-pressures arising from dynamically induced shear stresses.

Generalized material property functions allow you to use any laboratory or published data. This includes functions for the overburden correction function (Ks), shear stress correction (Ka), cyclic number, pore-water pressure, damping ratio, and G modulus reduction. When QUAKE/W performs an Equivalent Linear analysis, the Damping Ratio and G modulus vary with cyclic strain for successive iterations.


Collapse Surface Definition

A granular soil with a collapsed grain structure can fail at strengths below its conventional strength as defined by effective c' and φ' parameters. Using QUAKE/W, you can simulate this liquefaction potential by defining a collapse surface and steady-state strength for the material. QUAKE/W will use these properties to identify zones of liquefaction within the material.


Estimate Material Properties for Typical Materials

Most material property functions can be estimated using built-in properties for typical materials. The estimation process requires only fundamental material information, such as the N exponent for pore-water pressure functions, confining stress and plasticity index for G-reduction functions, and typical soil classifications for Cyclic number functions.


Comprehensive Range of Generalized Boundary Conditions

QUAKE/W supports a comprehensive list of boundary condition options including normal/tangential stress, X-Y stress, hydrostatic pressure, displacement, force, or spring boundaries. In keeping with the entire GeoStudio suite, QUAKE/W makes broad use of generalized functions for boundary condition definition. As such, actual field data over time or user-specified functional relationships can be pasted into QUAKE/W. For example, acceleration or velocity data over time can be used to create a displacement boundary function.


Insitu Condition Options

Insitu stresses can be established using either Poisson's ratio or by specifying an initial K 0 value for the material. This provides the ability to model heavily over-consolidated soils in which the horizontal stresses exceed the vertical.


Import Earthquake records

QUAKE/W allows you to import and scale earthquake time history records. Once the horizontal or vertical earthquake accelerations are imported, the peak acceleration and duration can be modified in order to adjust the values used in the QUAKE/W analysis to represent site-specific conditions.


Structural Elements

Structural elements can in included in a QUAKE/W analysis to investigate the effect of both axial and flexural structural stiffness on the dynamic response of the earth structure.


Integrate with SLOPE/W for Newmark Analyses

A Newmark analysis seeks to compute the potential permanent deformation in earth slopes arising from dynamic earthquake forces. The QUAKE/W computed dynamic forces can be used in SLOPE/W to compute yield accelerations and potential permanent deformations for each trial slip surface. The stability results can be sorted to identify the trial slip surface with the greatest potential permanent deformation.


Integrate with SLOPE/W to Model Excess Pore-Pressures and Stability

Excess pore-pressures computed by QUAKE/W can be considered in a SLOPE/W analysis to examine the effect of the elevated pore-water pressures on stability.


Integrate with SLOPE/W to Model Liquefaction Zones

Areas indicated as potential liquefaction zones in QUAKE/W can be evaluated in a SLOPE/W analysis to assess the influence of liquefaction on stability, given the associated liquefied strength reduction factor.


Integrate with SEEP/W to Dissipate Excess Pore-Water Pressures

The time required for dissipation of excess pore-water pressures generated during an earthquake can be determined by inputting QUAKE/W results into a SEEP/W analysis.


Integrate with SIGMA/W to Model Permanent Deformation

Liquefaction causes large strength reductions, which may lead to permanent deformations following an earthquake. Information on potential liquefaction zones generated in a QUAKE/W analysis can be used to compute the degree of permanent deformation with a stress-redistribution analysis in SIGMA/W.


Powerful Graphing and Contouring Options

Graphing is critical for the interpretation of stress-strain problems. The powerful contouring and graphing options in GeoStudio make it possible to plot both static and dynamic conditions such as stress, strain, pore-water pressure, acceleration, velocity and deformation at a point with time during the earthquake shaking. All of this data can be exported or copy/pasted directly into spreadsheet software.


View both Relative and Absolute Results

View displacements, velocities and accelerations as relative values (the finite element results relative to a fixed base) or as absolute values (the results added to the earthquake record). Relative data is used to compute, for example, excess pore-pressure, while absolute information is used primarily to visualize the earthquake motion.


View Deformed Mesh and Liquefaction Zone

Interpretation of the results is enhanced through the ability to view a deformed mesh, displacement vectors, and the shading of potentially liquefiable zones. A sequence of deformed meshes over time can be combined to make a movie of the earthquake motion.


Spectral Analysis at History Points

Look at the complete displacement, velocity and acceleration history record at key "history" points that can be defined at any point in the domain. Once the analysis is complete, you can perform a spectral analysis at these points to study the ground motion frequency and seismic characteristics.


View Stresses in a Mohr Circle

A Mohr Circle and associated space-force diagram can be plotted at any gauss point or node to further interrogate the results.


Sensitivity Analysis with QUAKE/W

A sensitivity analysis can be readily conducted with QUAKE/W by cloning multiple analyses using the Analysis Tree and then making slight changes to each one.






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