Instrumentação de fundações estaqueadas
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2016-08-19
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Universidade Federal de Goiás
Resumo
In the last few years there have been increasing demands for more elaborated foundations projects,
therefore, numerical tools and Geotechnical design methodologies have been developed. However,
these solutions need to be confirmed, which is possible through direct measuring of the elements,
achieved through instruments. Diverse research applied instrumentations to the load transfer
problem under controlled conditions of the field and laboratory, however, there are few studies that
aimed the application of a global instrumentation, of the construction as a whole, and for a longer
period of time with greater durability of the sensors. In this regard, this work had the main
objective to come up with a methodology for a versatile and durable instrumentation of piled
foundations in order to verify the load distribution transmitted by the pillars to the ends of the piles
from the making of the sensors to the load test application to measure loads at full scale. The use of
strain gages for construction of the instruments has been set. The sensors were fabricated and
calibrated using the physical space and equipment of PPGECON-UFG, using criteria and specific
procedures for this research. Prototypes were developed in scale models, small columns of
concrete, in order to reach the best arrangement of the sensors, performing load and performance
of instrumentation simulations. A construction was determined as a case study where it was
performed instrumented static load test at several levels, using the developed sensors. The sensors
developed by performance tests proved to be durable and accurate, and the immersion sensor
shown a closer behavior to the concrete through load tests. However, performance tests have
shown to be more susceptible to setting time and curing phenomena of the concrete. For
application in columns, it was found that the sensors manufactured showed good performance
when compared to calculated values of elastic modulus compound. Sensors applied to the load test
were able to obtain the distribution of loads at different levels, separating portions of the lateral
friction resistance per layer, and the unit shear stress of soil layer. From these results it was found
the maximum shear stress in the surface layer and it was possible to compare with semi-empirical
methods of load capacity and bridging charge-discharge curve. Proving that the installation of
instrumentation in the load test, even without occurrence of break, is used to verify the
performance of the test pile, knowing additional parameters and confirming the geotechnical
design.
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CRUZ JUNIOR, Aleones José da. Instrumentação de fundações estaqueadas. 2016. 208 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2016.