Probabilidade de ruína em estacas helicoidais nas fundações de torres de linhas de transmissão de energia elétrica

• Autor(a) principal: Neves, Alessandro Marques das
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Estadual de Maringá (RI-UEM)
• Texto Completo: http://repositorio.uem.br:8080/jspui/handle/1/3520
• topic: Engenharia civil, Fundações e estruturas, Ancoragem helicoidal, Fundações, Linhas de transmissão - Brasil; Foundation in line transmission; Anchor Helical; Uplift; - Brazil; Engenharias; Engenharia Civil

In lines transmission the projects are countless amounts of variability due to the fact of the transmission line consists of a work that may extend for several kilometers, going through various geological units and different microclimates. The geological unit changes cause variability in the resistance and changes in microclimate inserted variability in the requests. Among the characteristics that contribute to the security of a Transmission Line (LT), it has the architecture of the tower and the type of foundation used. For LTs high-voltage one of the most used types of structures are guyed towers consisting of steel structures, lattice in screwed profiles that are part of the mast support cables for transmission of electric energy, part of this type of structure also are ye that serves to give stability to the central mast and distribute and transmit structure's efforts foundations hence the main effort in the foundation are the tensile stresses. An alternative foundations to withstand tensile stresses consists of helical piles. Thus this work is an evaluation of the probability of ruin and safety of a stretch of LT. high voltage 230 kV performed mostly with towers of the cable-stayed type and foundations in helical piles. The calculation of the requests of the towers was done by software tower considering the wind maps of the region. Resistances were determined based on the torque installation of piles, calibrated from pullout tests. Were used in this study 29 towers totaling a stretch of 8.6 km. It was obtained as a result the probability of ruin and safety factors. We showed that when the helical piles are performed taking as reference the installation design torque the probability of ruin is practically nil, but when it is taken as a reference when installing the minimum depth available project the likelihood of LT ruin increases significantly and may compromise the stability of the towers and the reliability of the line transmission