Banca de DEFESA: JOAO PAULO LEAO LESSA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JOAO PAULO LEAO LESSA
DATE: 06/07/2021
TIME: 09:00
LOCAL: Sessão remota via Google Meet
TITLE:

ANALYSIS OF GROUND-SUPPORTED CYLINDRICAL TANKS SUBMITTED TO DIRECT AND INDIRECT ACTION OF SHRINKAGE AND THERMAL GRADIENT

KEY WORDS:

Axisymmetric structures; reinforced concrete; indirect actions; structural analysis.

PAGES: 136
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Estruturas
SPECIALTY: Estruturas de Concreto
SUMMARY:

Ground-supported cylindrical concrete tanks are largely used with many purposes, such as storing of liquids (water and wastewater, for example) and grains, or even used in projects that have bolder architectural appeal. These structures are often composed of thin walls and are commonly explored worldwide due to their versatility and structural performance. Despite many computational techniques developed on the study of reservoirs, these structures draw attention to the high number of recovery and structural reinforcement interventions that are still commonly done. In some cases, restauration processes are expensive and must be performed still early in structure’s lifespan. Not considering indirect loads is a common reason to a lower structural performance, since these neglected actions at design level may cause internal stresses-strains that have the potential to turn the structural performance impracticable. In reinforced concrete tanks, some indirect actions must be considered in order to obtain accurate structural performance, such as concrete shrinkage and thermal gradient effects, in the case of hot liquid storing. Therefore, this work aims to study the mechanical behavior of reinforced concrete reservoirs subjected to indirect actions caused by shrinkage and thermal gradient effects through classical analytical theories of axisymmetric structures. The results show that indirect loads generate stresses of great magnitudes in shell elements subjected to elastic analysis. Furthermore, variables such as humidity may increase strains caused by shrinkage, implying in loads that overcome concrete’s traction resistance, which favors the formation of cracks. The examined examples also show that stresses generated by thermal gradient effects are even higher than the other actions, leading to impractical structural performance when they are not considered in the design phase of the structure.

BANKING MEMBERS:
Presidente - 1121260 - EDUARDO NOBRE LAGES
Interno - 1121792 - FLAVIO BARBOZA DE LIMA
Interno - 1846598 - EDUARDO TOLEDO DE LIMA JUNIOR
Externo à Instituição - JOSÉ NERES DA SILVA FILHO - UFRN