- Design Considerations
- Skin friction / End bearing
- Group behavior
- Lateral movement
- Water level
- Differential settlements
- Stress distribution
- Pile type
- Solution
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GTS NX handles the full range of foundation analyses. You will be able to perform thorough analyses of spread footings, deep foundations, pile foundations, and shaft foundations. The advanced post- processor will generate results that you can then use to determine horizontal pile foundation movement, bearing capacity, and differential settlements.
The program also has the unique and advantageous ability to simulate group pile behavior. This ability will save significant amounts of time when determining the ultimate bearing capacity of group pile configurations.
GTS NX has foundation analysis capabilities that also extend to the investigation of the effects of new foundations on existing structures. With GTS NX you will be fully able to study the settlement and decrease of stability of adjacent structures due to the additional loading caused by your project footing.
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All physical phenomena includes non-linearity. Ground or structural behaviors are not an exception. Non-linear static analysis is used to simulate the behavior of ground considering such non-linearity, when the change with time is small and can be ignored. GTS NX considers the following non-linearity.
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Non-linearity of material : This occurs when the stress-strain relationship is non-linear. Most ground materials have this non-linearity.
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Geometric non-linearity: If the displacement-strain relationship is non-linear, the linear assumption is no longer applicable when the displacement is large, or the rotational deformation is large.
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Non-linearity of load and boundary: Non-linearity that includes the non-linear behavior at an interface, or non-linearity caused by the direction change of a load due to strain, caused by forces such as the follower force.
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GTS NX can consider all non-linearity mentioned above in analysis. Non-linear analysis can take a long time for complex non-linear systems because repeated calculations are conducted. Hence for the practicality, considering appropriate non-linearity can result in analysis results that simulate non-linear behavior, while maintaining the accuracy with little computational cost.
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Construction stage analysis can be used to simulate the construction process of the ground using numerical analysis. Construction stage analysis consists of multiple stages and loading/ boundary conditions, as well as elements, can be added or removed at each stage. This loading/ boundary or element change is applied at the start of each stage. GTS NX can use following types of analysis features to conduct Construction stage analysis.
Stress-Slope Analysis
Analysis of stress and slope stability during the construction process
Seepage Analysis
Stage by stage Steady state seepage analysis, Stage by stage Transient seepage analysis
Stress-Seepage-Slope coupled analysis
Sequential Seepage-stress analysis and Slope stability analysis during the construction process
Consolidation analysis
Consolidation analysis for environment change and construction process of embankment
Fully-coupled Stress-Seepage analysis
Stress analysis fully coupled with Transient seepage phenomenon
When conducting Construction stage analysis, the following should be considered.
- Addition/Removal of element
- Loading/Unloading of weight
- Change in boundary condition
- Change in rock material property
- Definition of load distribution factor
- Step by step underground water level
- Drained-Undrained analysis
- Initialization of displacement
- Stress Analysis for initial construction stage (Consider Ko condition)
- Restart
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Analysis that couples the seepage phenomenon and ground stress analysis can be classified in various ways, depending on the coupling.
The simplest way is to obtain the pore water pressure distribution by conducting seepage analysis beforehand, and reflecting it in the total stress/effective stress relationship equation of the stress analysis conducted in the following step. Such analysis is called sequential analysis. This method can be used to understand the static stress state of the given steady groundwater flow. However, since deformation due to stress analysis does not influence the seepage phenomenon inversely, there is no two-way coupling.
Fully-coupled Stress-Seepage analysis is the two-way coupled analysis between seepage analysis and stress analysis. Both analyses are used to solve the coupled equation. It can display the pore water pressure, stress or deformation changes with time.
The consolidation analysis begins with the assumption that steady state pore water pressure can be maintained, and is used to see the changes in excess pore water pressure. In other words, this analysis is used to simulate the phenomenon of how excess pore water pressure changes with the changes in load/boundary conditions.
Fully-coupled Stress-Seepage analysis does not follow assumption that steady state pore water pressure is maintained. Hence, it is suitable for simulating the transient seepage phenomenon, stress analysis and stability in abnormal condition in a fully coupled form. Unlike the consolidation analysis, it is possible to define the changes in seepage boundary conditions with time, boundary flow rate etc. In other words, for Fully-coupled Stress-Seepage analysis, it is possible to use all the transient seepage boundary conditions, structural load and boundary conditions.
This analysis can be applied to the ground stability analysis for rainfall or the of large-scale dam stability analysis for water level change. The seepage boundary conditions (Head/Flux) can all be used to analyze not only the changes in excess pore water pressure, but also the consolidation analysis that considers the total change in pore water pressure.
