Banca de DEFESA: Jeanisson Cesar Mariano Silva

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : Jeanisson Cesar Mariano Silva
DATE: 14/12/2023
TIME: 14:15
LOCAL: Plataforma Microsoft Teams
TITLE:

Evaluation of the use of pseudoelastic Nickel-Titanium alloy as reinforcement in a concrete beam

KEY WORDS:

Shape Memory Alloy; Smart materials, Flexural test, Special structures.

PAGES: 164
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

The use of reinforced concrete in the construction industry is widespread around the world and this makes some aspects need to be characterized in several technical aspects; it is a material that does not have good behavior in case of dynamic loads, due to its great rigidity and little, if any, deformation. Using a ductile material as reinforcement allows the structural system to have greater freedom to resist vibration and also reduce such abrupt rupture, giving greater security to the building. Therefore, the proposal to use the Nickel-Titanium (NiTi) alloy as reinforcement in concrete tends to favor the recovery of deformations of a structural element and avoid abrupt collapse. This experimental research is limited to the verification of the mechanical behavior of a beam in bending and is mainly based on the international standard ASTM C78. The specimens were manufactured with conventional steel reinforcement and Nickel-Titanium reinforcement; and, tested, carefully following the requirements suggested by the technical standard in force. The results showed that, for the conventional steel, bending strength of 7.37 ± 0.67 MPa and displacement of 10.47 ± 0.47 mm were obtained, making it possible to verify that the conventional steel reinforcement supported greater stress compared to Nickel-Titanium, however, lower displacement; for the Nickel-Titanium reinforcement, the beam presented a mechanical bending strength of 5.42 ± 0.44 MPa and a displacement of 67.30 ± 1.46 mm, demonstrating that the system resisted 26.48% less in bending, however, the displacement was about 642.79% greater in relation to steel reinforcement and also showed partial recovery of the initial position of the beam even after complete failure of concrete.

COMMITTEE MEMBERS:
Presidente - 1249764 - JORGE LUIZ DE ALMEIDA FERREIRA
Interno - 1523261 - COSME ROBERTO MOREIRA DA SILVA
Externo ao Programa - 6669206 - LUCIANO MENDES BEZERRA - UnBExterno à Instituição - RAIMUNDO CARLOS SILVÉRIO FREIRE JÚNIOR - UFRN
Externo à Instituição - WALDEK WLADIMIR BOSE FILHO - USP