Geotechnical Engineering Circular No. 9 Design, Analysis, and Testing of Laterally Loaded Deep Foundations that Support Transportation Facilities
Recommendations Regarding Broms Method
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| Recommendations Regarding Broms Method The Broms method is acknowledged by many state agencies as being acceptable for preliminary analysis of laterally loaded deep foundations or for simple projects of low complexity. This method is most applicable to short, stiff foundations that tend to rotate rather than bend, such assign post or noise wall foundations. 6.6 OTHER ANALYSIS METHODS FOR LATERALLY LOADED DEEP FOUNDATIONS Some state agencies also allow the use of empirical charts or tables, but these must be used on a case by case bases as intended by the agency that has published them. These are often for preliminary analyses or simple structures and are based on local practice or precedence. These should not be extrapolated beyond their intended use. Other analysis methods are not as widely used and should not be solely relied upon for analysis. Many of these methods have fundamental shortcomings or lack of precedence, use, and/or familiarity in the transportation industry. For large or complex projects, additional soil-structure interaction modeling, such as finite element modeling (FEM, maybe appropriate. Such advanced modeling should be done only by practitioners that are familiar with the nuances of FEM modeling to avoid creating erroneous or misleading results. Consideration should be given to performing lateral load tests, either in design or for construction verification, for large or complex projects, or projects that analyses with different methods indicate uncertainty in the results. 83 Other methods include the Characteristic Load method, developed by Duncan et al. (1994) and Evans and Duncan (1982) to analyze laterally loaded piles/shafts; the Brinch Hansen method (l, developed as a general procedure to estimate the lateral resistance of laterally loaded piles with a general distribution of soil resistance and elastic solutions based on the boundary element method by Poulos and Davis (1980) and Poulos and Hull (1989). Download 6.03 Mb. Share with your friends:
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