Podcast
Questions and Answers
What should be considered when selecting a resistance factor for shafts in clays?
What should be considered when selecting a resistance factor for shafts in clays?
By what percentage should the resistance factor values in Table 10.5.5.2.4-1 be reduced for a single shaft supporting a bridge pier?
By what percentage should the resistance factor values in Table 10.5.5.2.4-1 be reduced for a single shaft supporting a bridge pier?
What factor should not be increased when the resistance factor is decreased?
What factor should not be increased when the resistance factor is decreased?
How is the number of static load tests determined to justify resistance factors?
How is the number of static load tests determined to justify resistance factors?
Signup and view all the answers
In the context of variability assessment, how is a site defined?
In the context of variability assessment, how is a site defined?
Signup and view all the answers
Study Notes
Resistance Factor Selection
- Resistance factors are chosen based on the method for determining nominal shaft resistance.
- For shafts in easily disturbed formations (like clay), local experience with geology and construction is crucial.
- If using resistance factors from Table 10.5.5.2.4-1 for a single shaft supporting a bridge pier, reduce the values by 20%.
- When reducing resistance factors, do not increase the R factor from Article 1.3.4 to account for a lack of foundation redundancy.
- The number of static load tests needed to justify resistance factors is decided by the variability in site properties and geology.
Defining a Site
- A site, for variability assessment, is a project site or portion of it.
- Subsurface conditions should be geologically similar regarding subsurface stratification (sequence, thickness, geologic history), engineering properties and groundwater conditions.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
This quiz assesses your understanding of resistance factor selection for foundations in geotechnical engineering. Focus is placed on nominal shaft resistance methods, site variability assessment, and factors influencing resistance based on geological properties. Test your knowledge on the critical aspects of foundation support for structures like bridge piers.
