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A Comparison of Solutions of Laterally Loaded Long Piles Using Subgrade Modulus Approach
Analysis of laterally loaded piles is a relatively complex, but very important part of pile foundation analysis. Generally, the methods of solution related to laterally loaded long piles are based on the popular ‘subgrade modulus’ approach. Design codes currently used for design of offshore piles prescribe for analysis based on nonlinear ‘p-y’ data, which is essentially the ‘subgrade modulus’ approach. The ‘p-y’ data represent the stress–displacement relation of soil when stressed laterally. Relatively, simplified analyses are also carried out for lateral loading of piles which require the application of appropriate subgrade parameters. However, difficulty often arises while carrying out simplified analysis in the selection of appropriate subgrade parameter ηh, which is the coefficient of variation of the modulus of horizontal subgrade reaction or constant of horizontal subgrade reaction. The results of simplified solutions may vary significantly when compared with results of analysis using detailed ‘p-y’ data if inappropriate values of ηh are used in simplified analyses. To examine the issue and calibrate the parameter ηh, analysis was carried out for steel tubular piles embedded in normally consolidated clay using nonlinear ‘p-y’ data and the equivalent values of ηh were back-calculated for use in relatively simplified approaches. The ‘p-y’ data for clays were derived for static loading following the procedure given by the international code API RP 2GEO (American Petroleum Institute: Geotechnical and Foundation design Considerations, API, Washington, DC, 2014, [4]). Based on the study, appropriate values of ηh were calibrated using relatively simplified methods. It is shown that results of simplified solutions match very well with the results of the more detailed analysis when appropriate values of ηh are used. Further, the degradation of the values of ηh with increasing lateral load in pile was also examined. Based on the study, the range of appropriate equivalent values of ηh is suggested for use in similar pile–soil conditions for static lateral loading of pile.
A Comparison of Solutions of Laterally Loaded Long Piles Using Subgrade Modulus Approach
Analysis of laterally loaded piles is a relatively complex, but very important part of pile foundation analysis. Generally, the methods of solution related to laterally loaded long piles are based on the popular ‘subgrade modulus’ approach. Design codes currently used for design of offshore piles prescribe for analysis based on nonlinear ‘p-y’ data, which is essentially the ‘subgrade modulus’ approach. The ‘p-y’ data represent the stress–displacement relation of soil when stressed laterally. Relatively, simplified analyses are also carried out for lateral loading of piles which require the application of appropriate subgrade parameters. However, difficulty often arises while carrying out simplified analysis in the selection of appropriate subgrade parameter ηh, which is the coefficient of variation of the modulus of horizontal subgrade reaction or constant of horizontal subgrade reaction. The results of simplified solutions may vary significantly when compared with results of analysis using detailed ‘p-y’ data if inappropriate values of ηh are used in simplified analyses. To examine the issue and calibrate the parameter ηh, analysis was carried out for steel tubular piles embedded in normally consolidated clay using nonlinear ‘p-y’ data and the equivalent values of ηh were back-calculated for use in relatively simplified approaches. The ‘p-y’ data for clays were derived for static loading following the procedure given by the international code API RP 2GEO (American Petroleum Institute: Geotechnical and Foundation design Considerations, API, Washington, DC, 2014, [4]). Based on the study, appropriate values of ηh were calibrated using relatively simplified methods. It is shown that results of simplified solutions match very well with the results of the more detailed analysis when appropriate values of ηh are used. Further, the degradation of the values of ηh with increasing lateral load in pile was also examined. Based on the study, the range of appropriate equivalent values of ηh is suggested for use in similar pile–soil conditions for static lateral loading of pile.
A Comparison of Solutions of Laterally Loaded Long Piles Using Subgrade Modulus Approach
Lecture Notes in Civil Engineering
Muthukkumaran, Kasinathan (editor) / Reddy, C. N. V. Satyanarayana (editor) / Joseph, Anil (editor) / Senthamilkumar, S. (editor) / Mahanta, Rupam (author)
Indian Geotechnical Conference ; 2021 ; Trichy, India
2022-11-29
11 pages
Article/Chapter (Book)
Electronic Resource
English
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