Evolução da transferência de carga e set-up de fundações por estacas tubulares metálicas cravadas: estudo de caso

fundações cravadas frequentemente tempo, cravação, cicatrização ou set-up . Para quantificar o ganho de capacidade carga, é variável acordo instalação e geometria estaca, ser utilizados ensaios de carregamento dinâmico executados em diferentes intervalos de tempo após o término da cravação das estacas. Além de mostrar ABSTRACT: The load capacity of driven piles frequently increases with time after pile installation and this phenomenon is known as aging or set-up. To quantify the gain in pile capacity, which depends on the soil type and pile geometry, dynamic loading tests can be performed at different time after the pile installation. Besides providing information on the variation of pile capacity with time, allowing the understanding of the foundation behavior under service loads, these tests can show the evolution of the load transfer along the pile length at different times after installation. The aim of this study is to present the set-up effect on the load capacity of a steel pipe pile installed in predominantly sandy soil. In this study, results of dynamic load tests with increasing energy are presented for a steel pipe pile at different time intervals after installation, 0 min, 105 min, 345 min, and 6000 min. The results show that after 100 h of pile installation, the shaft resistance has increased considerably. The set-up effect on the pile studied in sandy soils was pronounced in a few days after its installation. In addition, the results of the dynamic load tests showed excellent agreement with the results of the static load test performed on the pile after the dynamic tests.