Análise de métodos semi-empíricos segundo provas de carga instrumentadas em estacas hélice contínua
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Tipo
TCC
Data de publicação
2019-12-16
Periódico
Citações (Scopus)
Autores
Mucci, Luan Mesquita
Pinto, Pedro Loschiavo
Scatola, Raphael Queiroz
Bonilha, Ricardo Sanvito
Oliveira, Rodrigo Alves de
Pinto, Pedro Loschiavo
Scatola, Raphael Queiroz
Bonilha, Ricardo Sanvito
Oliveira, Rodrigo Alves de
Orientador
Lazaro, Alberto Alonso
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Resumo
A prova de carga instrumentada é um recurso importante para compreensão do comportamento de
uma estaca pois permite analisar a transferência de cargas ao longo de sua profundidade através da
instalação de sensores em diferentes pontos do fuste, além de obter sua carga de ruptura. Por não ser
uma informação obrigatória por norma técnica, grande parte dos projetos de fundação se limitam à
realização de provas de carga estáticas sem instrumentação em profundidade. Com base nesta
realidade, o presente trabalho analisou e comparou resultados obtidos em provas de carga
instrumentadas realizadas em estacas hélice contínua no município de Itatiba-SP, com valores
obtidos pelos métodos semi-empíricos de Aoki e Velloso (1975), Décourt e Quaresma (1978),
Antunes e Cabral (1996) e Alonso (1996). O objetivo da análise foi verificar a confiabilidade dos
métodos, determinando quais os mais precisos para as estacas estudadas. Para tal, apresentam-se
cinco provas de carga executadas em estacas hélice contínua instrumentadas com strain-gages,
sendo detalhadas nesse trabalho as características de cada estaca. Os resultados mostraram um
grande desvio entre os valores obtidos pelos métodos semi-empíricos, sendo que as falhas na leitura de alguns sensores prejudicaram uma análise mais precisa. Décourt e Quaresma (1978) e Alonso
(1996) apresentaram a melhor aproximação com os resultados da instrumentação.
Instrumented load testing is an important feature for understanding the behavior of a pile as it allows analyzing load transfer along its depth by installing sensors at different points of the shaft, and obtaining its failure load. As this is not a mandatory information by technical standard, most foundation designs are limited to performing static load tests without in-depth instrumentation. Based on this reality, the present study analyzed and compared results obtained from instrumented load tests performed on auger cast piles in the municipality of Itatiba-SP, with values obtained by the semi-empirical methods of Aoki and Velloso (1975), Décourt and Quaresma (1978), Antunes and Cabral (1996) and Alonso (1996). The objective of the analysis was to verify the reliability of the methods, determining which ones are more accurate for the studied cuttings. To this end, five load tests performed on continuous propeller piles instrumented with strain gages are presented, and the characteristics of each pile are detailed in this work. The results showed a large deviation between the values obtained by the semi-empirical methods, and the reading failures of some sensors impaired a more accurate analysis. Décourt and Quaresma (1978) and Alonso (1996) presented the best approximation with the instrumentation results.
Instrumented load testing is an important feature for understanding the behavior of a pile as it allows analyzing load transfer along its depth by installing sensors at different points of the shaft, and obtaining its failure load. As this is not a mandatory information by technical standard, most foundation designs are limited to performing static load tests without in-depth instrumentation. Based on this reality, the present study analyzed and compared results obtained from instrumented load tests performed on auger cast piles in the municipality of Itatiba-SP, with values obtained by the semi-empirical methods of Aoki and Velloso (1975), Décourt and Quaresma (1978), Antunes and Cabral (1996) and Alonso (1996). The objective of the analysis was to verify the reliability of the methods, determining which ones are more accurate for the studied cuttings. To this end, five load tests performed on continuous propeller piles instrumented with strain gages are presented, and the characteristics of each pile are detailed in this work. The results showed a large deviation between the values obtained by the semi-empirical methods, and the reading failures of some sensors impaired a more accurate analysis. Décourt and Quaresma (1978) and Alonso (1996) presented the best approximation with the instrumentation results.
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Palavras-chave
fundação , estaca hélice contínua , instrumentação , métodos semi-empíricos , foundation , auger cast pile , instrumentation , semi empirical methods