Comparação entre desempenhos de estacas metálicas tubadas de ponta aberta e fechada na Baixada Santista. / Comparison between the behavior of steel pipe piles with opened and closed ends at the Santos Coastal Plain.

AUTOR(ES)

Marcelo Pirani Ghilardi

DATA DE PUBLICAÇÃO

2005

RESUMO

This MSc thesis dealt with the plug phenomenon in open-ended-toes steel pipe piles. This phenomenon occurs when, in the driving process of an open-ended toe pile, the soil that gets into its base alters its behavior, making it similar to one of a close-ended toe under static load and, sometimes, even under dynamic load. Many bored piles, installed with the presence of a water level, on a river, lake or a harbor area, have as the most feasible alternative the use of steel pipes, of large diameter, to achieve the project level. If the plug phenomenon was used, in this specific case, the pile would act in a similar manner of a driven pile and not of a bored pile, and the safety factors used on its calculation would deserve a better evaluation. The plug phenomenon was presented and characterized through the bibliographic references. To evaluate and better comprehend the phenomenon, a mathematical model based on the Cambefort’s Laws, modified by Massad, were used. This model was applied to the load-settlement curve at the top of the pile and allowed to obtain the magnifier factor (μ), that considers residual loads as friction loads. Using the μ factor, obtained in load tests gathered from the literature, and evaluating the shape of the load settlement curve at the pile head, that can denounce, qualitatively, the mobilization phases of the shaft load and the base load, it was possible to establish a relationship between the behavior of driven steel pipe piles, with plugged open-ended toes, and with close-ended toes. The determination of the ultimate unit shaft friction (fu), for the same piles, and its comparison with the existing data on literature, revealed that the values originated from the research were reliable and the procedures adopted in the research required the carrying of the static loads up to the ultimate load or, at least, to a great deformation.

ASSUNTO(S)

soils santos coastal plain foundations santos coastal plain solos baixada santista fundações baixada santista structures santos coastal plain estruturas baixada santista

Documentos Relacionados

• Mangrove Recovering: a case study at "Baixada Santista" (Santos Coastal Plain), São Paulo State, Brazil
• Câmara e agenda 21 regional para uma rede de cidades sustentáveis: a região metropolitana da baixada santista.
• Butterflies (Lepidoptera, Papilionoidea and Hesperioidea) of the "Baixada Santista" region, coastal São Paulo, southeastern Brazil
• STUDY OF THE BEHAVIOR OF SHORT METALLIC PILES TO COMPRESSION IN SEDIMENTARY GROUND
• Comparação de Métodos Diretos e de Dois-Passos na identificação de sistemas em malha fechada.