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      Dynamic driving formulas and static loadings in the light of wave equation solutions

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          Abstract

          Abstract The advances in pile monitoring have motivated attempts to support dynamic formulas to estimate pile bearing capacity. Based on numerical analysis of the wave equation and the results of dynamic loading tests in three piles the paper deals with the investigation of the soundness of some of the most used in Brazil, namely, the so called Chellis-Velloso Formula, the Energy Approach Equation and Uto’s Formula. The former gained strength through a misinterpretation of Casagrande (1942) statement that the elastic compression of a pile during driving is a measure of the dynamic force with which the soil is tested, and not of its static resistance. Therefore, the elastic compression and rebound, measured during driving, are generally smaller than the corresponding static values. The second is based on an elasto-plastic load-displacement relationship without physical meaning, besides the fact that the effective energy in driving a pile is related to the work of dynamic forces and has nothing to do with the static resistances. The third was derived from a simplified solution of the wave equation, assuming among other hypothesis that there is no friction along pile shaft. The paper shows the ineffectiveness of attempts to universally validate these formulas with dynamic pile monitoring and the implications in the simulation of static loadings.

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          Most cited references11

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          Pile-Driving Analysis by the Wave Equation

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            Load Transfer for Axially Loaded Piles in Clay

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              Behavior of deep foundations

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                Author and article information

                Journal
                soiroc
                Soils and Rocks
                Soil. Rocks
                Associação Brasileira de Mecânica dos Solos (São Paulo, SP, Brazil )
                1980-9743
                2675-5475
                2021
                : 44
                : 2
                : e2021061921
                Affiliations
                [01] São Paulo São Paulo orgnameUniversidade de São Paulo orgdiv1Escola Politécnica Brazil
                Article
                S2675-54752021000200401 S2675-5475(21)04400200401
                10.28927/sr.2021.061921
                17f1173b-c88a-4827-88a1-1d55b29bdc57

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 04 January 2021
                : 21 April 2021
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 15, Pages: 0
                Product

                SciELO Brazil

                Categories
                Articles

                Bearing capacity,Static and dynamic displacements,Elastic rebounds,Driven piles,Dynamic formulas

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