Structural engineering software, spreadsheets, for analysis and design, including wood, lateral analysis, concrete, steel, aluminum, glass, masonry, bridge, foundation. SHALLOW FOUNDATION ANALYSIS & DESIGN FTGCAP analyzes the bearing capacity of a spread footing using the formulas recommended by Terzaghi (1934), Meyerhof (1963), Hansen (1970), and Vesic (1973). FTGSETT estimates the settlement of elastic and consolidation settlements of a spread footing using laboratory and field test data.
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GEO5 contains several programs for design and analysis of pile foundations. It is necessary to select a suitable program considering the structure type and available results of a geotechnical survey.
Programs for Pile Foundation Design
The Pile program is designed to verify vertical bearing capacity of a compressive and tensile pile, pile settlement and horizontal bearing capacity of a single pile. It is also possible to design and verify a reinforcement of different types of piles, which can be divided according to pilling method as driven, bored or CFA piles.
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The Pile CPT program is designated to verify bearing capacity and settlement according to results of a cone penetration tests (CPTs) or standard penetration tests (SPTs).
The Pile Group program is designated to verify pile group with rigid foundation mat, using the spring method (FEM) or analytical solution.
The Micropile program verifies tube micropiles (made from steel tube). When analyzing the bearing capacity
of the micropile, the root part and cross section of the micropile are verified.
of the micropile, the root part and cross section of the micropile are verified.
Some problems (eg. single pile) can also be solved by the finite element method in the FEM program using axisymetry.
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GEO5 Geotechnical Programs
Including Concrete, Gravel, and Piles
Wood provides static and dynamic foundation design services for machinery systems. In addition to including machine loads, we evaluate local soil conditions (allowable bearing capacity, static settlement guidelines, etc.) and compatibility with the site characteristics such as frost heave potential.
Example of cracked foundations, causing vibration and equipment reliability problems. |
Contents [ hide ]
1 Scope, Features, and Benefits
Skid, Compressor, and Foundation Analysis |
Top view of operating deflection shape |
Side view of operating deflection shape |
1.1 Scope
In each project, we:
- Optimize the dynamically loaded foundation by considering all types of foundations.
We have experience with:
- Concrete blocks
- Gravel pads
- Piles
- Screw Piles
- Table top
- Hybrid (concrete and piles)
- Structural foundations (FPSO, offshore platforms, steel modules/structures)
- Design and assess foundations for all types of machinery systems
- Include new and remediation/revamp projects
- Provide solutions to existing vibration problems
- Account for geotechnical considerations at the site
- Evaluate dynamic loading across all operating conditions
1.2 Features Include
- Accurate determination of dynamic loads caused by equipment and the effects of such loads taking into account the soil and structure interaction.
- Identification of area soil conditions (working directly with local geotechnical companies) for design projects.
- Assessment of the foundation’s natural frequencies, damping characteristics, and potential resonance conditions, as well as the impact of vibration and dynamic stress.
- Field measurements taken for existing foundations, to help define soil properties to insert appropriately into our models.
- Recommended foundation design to limit vibration to safe levels.
- Installation recommendations
- Dynamic study of rigid, flexible, and pile foundation under harmonic, transient, and random loading.
- Geotechnical modeling of the soil mass, damping, and stiffness characteristics.
- Operating deflection shapes (ODS) on foundation repair/troubleshooting projects.
- Structural design of foundations, including concrete blocks and piles.
1.3 Customer Benefits
- Optimization of the foundation design based on foundation performance and construction costs.
- Elimination of foundation failures – extremely costly problems for owners.
- Dynamic foundation design – an integral element of a vibration mitigation strategy.
- Lower maintenance costs and improved safety –properly designed foundations reduce stresses on bearings.
- Reduced failure of auxiliary equipment including small-bore attachments .
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Examples of foundation design and dynamic analysis.
Top left: compressor, skid and foundation design provides an integrated approach and reliable results.
Top right: concrete foundation dynamics.
Bottom pictures illustrate pile foundation design and dynamic analysis.
Top left: compressor, skid and foundation design provides an integrated approach and reliable results.
Top right: concrete foundation dynamics.
Bottom pictures illustrate pile foundation design and dynamic analysis.
2 Wood Advantages
Wood’s expertise in machinery design and dynamics, combined with in-house experts is unique.
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Foundation services compliment Wood’s pulsation, mechanical, torsional, and skid design, resulting in an integrated solution.
Few other firms have this broad range of design expertise:
Few other firms have this broad range of design expertise:
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- Combination of geotechnical engineering with in-depth knowledge of machinery behavior
- Comprehensive machinery and foundation models
- Extensive field experience resolving existing foundation problems
- Inclusion of dynamic loads from equipment (gas rod loads, unbalance, pulsation-induced forces in vessels, etc.)
- Database of detailed reciprocating compressor models to accurately simulate system loading and response. Models have been verified with field testing
3 Related Information
4 Related Services
Compressor Foundation Design (installation and field testing) | Inspection of pile - skid connections as a part of modification to an existing foundation (to increase dynamic stiffness) | Compressor foundation failure |
Example 1: Gravel foundations impacts vibration High vibrations were measured on the skid and compressor package. An operating deflection shape (ODS) analysis determined that there were several local bending modes of the compressor skid as well as many modes of the piping, vessels and compressor cylinders in the range of the first and second order of compressor speed. Soil and gravel pad properties were evaluated with the compressor skid model to address the resonant condition. | Example 2: Torsional vibration on piles When a pile supported compressor foundation was experiencing excessive torsional vibrations, we were able to mitigate these vibrations without using additional piles or imposing very high cost for removal of the compressor skid from the top of piles and moving it back. Using a unique solution, we increased the torsional stiffness, resolving the foundation vibration problem at a fraction of the expected cost. |
5 Key Words
- Dynamic Foundation Study
- Pile foundation design
- Foundation resonance