Uma nova metodologia de extrapolação dos dados da prova de carga dinâmica: MES-CASE
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2010-02-26
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Universidade Federal de Goiás
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Since 1983, when the experiment of dynamic load has been plunged in Brazil, the execution of this kind of experiment has become a common practice in foundation sites on precast
inserted piles. In many cases the experiment of dynamic load doesn t mobilize the ultimate strength of the tested pile; the causes of these events may be due to: the available equipment at the site isn t capable of obtaining enough kinetic energy to mobilize the ultimate strength; the structural element presents ruptures; the client desire of not mobilizing all the ultimate strength; among others. Knowing the necessity of determining the ultimate strength in order
to adapt the construction to the security factors required by NBR 6122/1996, this essay pursuits developing a methodology of extrapolation of the curve of mobilized static resistance
versus the maximum displacement obtained through the dynamic load proof (dynamic load experiment of crescent energy), applying the Simplified Method CASE, to inserted precast piles. Studying 21 (twenty-one) proofs of dynamic load (PDL), an extrapolation methodology has been developed entitled as Simplified Extrapolation Methodology of CASE Method (SEM-CASE). The methodology is based on the criteria of complementary energy, presented by Aoki in 1997. The results have demonstrated that the method SEM-CASE has presented itself as easy manipulation. The estimated values of ultimate complementary strength calculated by the SEM-CASE has presented pretty close to the measured values, existing only one pile which presented a value error bigger than 10%. The estimated values of ultimate pile
strength, obtained by the SEM-CASE, showed themselves similar to the measured values, also having a value error inferior to 10%. The exponential function has obtained better results of adjustment coefficient (R2) related to the points of the curve of mobilized static resistance versus the maximum displacement measured in the dynamic load proof. Besides, applying model selection criteria was obtained that the exponential function is more efficient to estimate the curve of mobilized static resistance versus the maximum displacement than the hyperbolic and parabolic functions.
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ALVES, éder Chaveiro. A new method of extrapolating data from the dynamic laod test: MES-CASE. 2010. 278 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Goiás, Goiânia, 2010.