2025-04-012025-04-012024-05-24PAIVA, André Hideo Umemura. Avaliação do atrito negativo em estaca isolada conforme NBR 6122/2019 e suas consequências em projetos de fundações. Orientador: Gérson Jacques Miranda dos Anjos. 2023. 10 f. Trabalho de Curso (Bacharelado em Engenharia Civil) – Faculdade de Engenharia Civil, Instituto de Tecnologia, Universidade Federal do Pará, Belém, 2024. Disponível em:https://bdm.ufpa.br/jspui/handle/prefix/7936. Acesso em:.https://bdm.ufpa.br/jspui/handle/prefix/7936Negative Skin Friction (NSF), as described in item 3.2 of NBR 6122/2019, corresponds to the lateral friction on piles when the settlement of the adjacent soil is greater than the settlement of the foundation element. Item 5.8 discusses the possibility of incorporating negative skin friction in geotechnical and structural design of foundations, whenever its influence is considered. Item 8.4.3 of the mentioned standard emphasizes the need to evaluate the phenomenon whenever possible. This study will specifically discuss item 5.8.1, which deals with negative skin friction in relation to the global safety factor. Nowadays, it is recognized that the majority of pile installation processes cause settlements in the adjacent soil. Fellenius & Altaee (1995) emphasize that the phenomenon of negative skin friction affects both driven and bored piles, regardless of the magnitude of the settlement. In both the previous Brazilian standard and the current one (NBR 6122/2019), the topic is approached similarly, which can lead to null or negative working load results. Its consideration would certainly increase foundation project costs. This study will present two models for assessing the phenomenon: rigid-plastic and elastic-plastic. Furthermore, a modification to the mentioned standard will be proposed.Acesso AbertoAtrito negativoPlano neutroModelo rígido plásticoModelo elasto plástico.Negative skin frictionNeutral planeRigid-plastic modelElastic-plastic model.CNPQ::ENGENHARIAS::ENGENHARIA CIVILTrabalho de Curso - Graduação - Artigo