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Structural Engineering and Mechanics
  Volume 71, Number 4, August25 2019, pages 363-375
DOI: http://dx.doi.org/10.12989/sem.2019.71.4.363
 


Nonlinear responses of energy storage pile foundations with fiber reinforced concrete
Saule Tulebekova, Dichuan Zhang, Deuckhang Lee, Jong R. Kim,Temirlan Barissov and Viktoriya Tsoy

 
Abstract
    A renewable energy storage pile foundation system is being developed through a multi-disciplinary research project. This system intends to use reinforced concrete pile foundations configured with hollowed sections to store renewable energy generated from solar panels attached to building structures in the form of compressed air. However previous research indicates that the compressed air will generate considerable high circumferential tensile stresses in the concrete pile, which requires unrealistic high hoop reinforcement ratio to avoid leakage of the compressed air. One possible solution is to utilize fiber reinforced concrete instead of placing the hoop reinforcement to resist the tensile stress. This paper investigates nonlinear structural responses and post-cracking behavior of the fiber reinforced concrete pile subjected to high air pressure through nonlinear finite element simulations. Concrete damage plasticity models were used in the simulation. Several parameters were considered in the study including concrete grade, fiber content, and thickness of the pile section. The air pressures which the pile can resist at different crack depths along the pile section were identified. Design recommendations were provided for the energy storage pile foundation using the fiber reinforced concrete.
 
Key Words
    fiber reinforced concrete, pile foundation, nonlinear structural responses, compressed air, renewable energy storage
 
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