2D and 3D Analysis of Soil-Structure Systems
- Structure is represented by standard finite elements.
- Excavated soil block is modeled using plane-strain and solid finite elements.
- Fluid medium may be modeled with 2D or 3D acoustic finite elements.
- Nonlinear components may be modeled using linearized properties.
- Foundation piles are modeled using new Pile elements.
- Piping system can be modeled using new Pipe element
Soil Model
- Soil media is modeled with horizontally layered system over uniform halfspace.
- Irregular soil zones are modeled using finite elements as part of the structure.
- Primary nonlinearities in the free field are modeled using equivalent linear method.
- Secondary soil nonlinearities in the SSI model may be accounted for by iterating on near-field soil properties using equivalent linear method.
- Effect of ground water is accounted for by assigning appropriate Poisson’s ratio.
Types of Analysis
- Site response due to body waves and surface waves
- Forced vibration response of machine foundations
- Ambient vibration response of vibration-sensitive facilities
- Seismic response of nuclear facilities
- Soil-structure-fluid interaction analysis
- Structure-soil-structure interaction analysis
- Seismic response of structures subject to incoherent ground motions
- Random vibration analysis
- Seismic racking response of tunnels and underground structures
- Dynamic soil pressure analysis
- Stress analysis of pipelines subject to spatially variable ground motions
- Seismic response of structures on large pile group foundations
- Seismic response of gravity-based offshore structures
- Seismic response of structures founded on improved soils
Input
- Free format input data facilitates data entry, minimizes errors, and streamlines interfacing with other codes.
- Data block input format provides flexibility for organizing and moving blocks of data in the input file and between different modules.
- Flexible node, element and property labeling facilitates model development and allows structural models to be imported “as is” from other codes.
- Structure and excavated soil models can be developed separately and glued together with different node and element numbering.
- Free style commenting makes labeling and identifying data easy.
- Built-in arithmetic operators enable easy and error-free units conversion for data entry.
- Extensive internal program error checking minimizes user errors and saves time.
- Extensive data generation capability facilitates input data preparation.
- Input data for program modules can be provided in a single file in the new versions.
Output
- Detailed printout for checking results and documentation.
- Time and date stamp for QA and production run documentation.
- Automatic plot file generation from runs facilitates importing results for spreadsheets and other production environments for tabulation and plotting of results.
Sample Results
- Transfer functions
- Maximum values and time histories of acceleration, velocity, and displacement responses
- Acceleration response spectra
- Interstory forces and moments
- Maximum values and time histories of base forces (normal & shear) and moments (overturning & twisting)
- Maximum values and time histories of stresses, forces, and moments
- Maximum values and time histories of dynamic soil reaction forces on below-grade sidewalls
- Mean values and spectral density output from random vibration analysis
