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| QUAKE/W - Dynamic Earthquake analysis |
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QUAKE/W is a geotechnical finite element software product for the dynamic analysis of earth structures subjected to earthquake shaking, or point dynamic forces from a blast or a sudden impact load. Using QUAKE/W, you can determine the motion and excess pore-water pressures that arise due to shaking. Its comprehensive formulation makes QUAKE/W well suited to analyzing a wide range of problems.
Generalized material property functions allow you to use any laboratory or published data. Three constitutive models are supported: a Linear-Elastic model, an Equivalent Linear model, and an effective stress Non-Linear model. QUAKE/W uses the Direct Integration Method to compute the motion and excess pore-water pressures arising from inertial forces at user-defined time steps.
QUAKE/W can be used to analyze almost any dynamic earthquake problem you will encounter in your geotechnical, civil, and mining engineering projects.
Easy to Use
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| Defining a Dynamic Earthquake Model |
The unique CAD-like technology in QUAKE/W allows you to generate your finite element mesh by drawing regions on the screen. You can then specify material properties, import earthquake records, and apply boundary conditions and structural elements. If you make a mistake, you can correct it with the Undo command.
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| Viewing the Analysis Results |
Once you have solved your problem, QUAKE/W offers many tools for viewing results. Animate the motion by viewing at the displacements for successive steps. Look at the complete displacement, velocity and acceleration history record at key points. Perform a spectral analysis at these points to study the ground motion frequency and seismic characteristics. Generate contours or x-y plots of stress, strain, pore-water pressure, and over 35 other parameters. Show the shaded liquefaction zone. View any stress state as a Mohr Circle with the associated space-force diagrams. Then export the results into other applications, such as Microsoft Excel or Word, for further analysis or to prepare presentations.
Typical Applications
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QUAKE/W can model the dynamic behavior of almost any earth structure, including:
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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 during earthquake shaking.
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| Features: |
- Linear analysis using linear-elastic soil properties.
- Equivalent Linear analysis, which varies soil properties for successive iterations (Damping Ratio and G-Modulus vary with cyclic strain for successive iterations).
- Generalized data point functions for specifying material properties, including functions for overburden correction function (Ks), shear stress correction (Ka), cyclic number, pore pressure, damping ratio, and G modulus reduction.
- Imported earthquake records; both horizontal and vertical acceleration vs. time records can be used.
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- Scale peak acceleration and time duration of imported earthquake records for site-specific conditions.
- Boundary condition types include X and Y displacements, forces, pressures, and spring constants, as well as stress, fluid pressure, and self-weight gravity loading.
- Definition of liquefaction potential using a collapse surface and steady-state strength.
- Structural elements for soil-structure interaction; specifying both axial and flexural stiffness can affect the dynamic response of the system.
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- History nodes show complete record of displacement, velocity and acceleration.
- Many ways to view results, including x-y plots, contours, deformed mesh, animation, spectral analysis, data tables, and Mohr circles.
- View most result parameters for static conditions, dynamic conditions, or both.
- View displacements, velocities and accelerations as relative values (the finite element results) or as absolute values (the results added to the earthquake record).
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| Use QUAKE/W results in a SLOPE/W stability analysis |
Earthquake shaking of ground structures creates inertial forces that may affect the stability of the structures. The shaking may also generate excess pore-water pressures. Both the dynamic stress conditions and the generated pore-water pressures can be taken into SLOPE/W to study how an earthquake affects the earth structure stability and deformation. SLOPE/W can perform a Newmark-type of deformation analysis to determine the yield acceleration and estimate the permanent deformation of the earth structure.
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| Dissipate excess QUAKE/W pore-water pressures in SEEP/W |
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Excess pore-water pressures generated during an earthquake can be brought into SEEP/W to study how long it will take to dissipate them.
Engineering Methodology Book
When you purchase a QUAKE/W 2007 license you also receive a copy of the QUAKE/W Engineering Methodology book, Dynamic Modeling with QUAKE/W 2007. This book is not a software manual but a full-length book that discusses why and how to model. It does not describe how to use the commands in the software or which buttons to click - that is provided in detail in the Online Help. Instead it is about thinking: how to think before, during and after setting up and solving a model. The Engineering Methodology book has chapters devoted to: |
| Numerical Modeling: What, Why and How
Geometry and Meshing
Material Properties
Bounday Conditions
Analysis Types
Functions in GeoStudio
Numerical Issues
Visualization of Results
Illustration and Verification Examples
Theory |
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