Estudo de estacas escavadas de pequeno diâmetro tracionadas em João Pessoa - PB

Abstract

The quality of a structure's foundations directly affects the safety and stability of the rest of the building. In this sense, given the various types of deep foundations currently on the market, molded piles "in loco" have great cost-benefit advantages and, therefore, are widely used in civil construction. However, it is not difficult to see pathologies involving horizontal efforts and moments that result in traction efforts on them. In order to verify the load capacity of piles subjected to these efforts, and thus guarantee the stability and safety of foundation elements, the present study was developed. Using small diameter and length piles, carried out in the city of João Pessoa-PB, it sought, initially, to collect and characterize the soil samples through laboratory tests, and then analyze their strength when pulled. Thus, two excavated piles molded “in loco” were tested in traction, through a static load test under traction, which presented results of the same order of magnitude. It was also calculated, through the semi-empirical methods (Aoki-Velloso, Décourt-Quaresma, Teixeira and Ortigão and Palmeira), the load capacity of the tensioned piles. At the end, a comparison was made between the values obtained, with the results of the load test reaching more than three times those calculated, depending on the method analyzed, with Ortigão and Palmeira presenting the smallest difference. It can be seen, therefore, that load forecasts usually present values that are very different from the calculation methods, which highlights the need for further studies to better understand the behavior of these piles.