Banca de QUALIFICAÇÃO: JONATHAN HENRIQUE CORDEIRO NUNES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : JONATHAN HENRIQUE CORDEIRO NUNES
DATE: 06/09/2023
TIME: 08:30
LOCAL: Ambiente virtual
TITLE:

Comparative study of shear models for reinforced concrete elements with solid and hollow circular cross-sections

KEY WORDS:

Reinforced concrete; Solid and hollow circular section; Shear strength

PAGES: 92
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Estruturas
SPECIALTY: Estruturas de Concreto
SUMMARY:

Reinforced concrete is the most commonly used material in civil engineering projects, justified by its durability, versatility, and provided strength. Despite most projects adopting rectangular sections for reinforced concrete elements, in various situations, circular cross-sectional elements, both solid and hollow, are employed. Among these applications, notable uses include bridge columns, support structures for lighting, flag masts, pipelines, precast piles, etc. However, the design of such circular sections is inadequately addressed in major codes and standards for reinforced concrete worldwide, especially concerning shear forces. An approach used by international codes and standards involves using parameters to relate the circular cross-section to the rectangular one, such as the effective height d and the width bw. However, proposals for models for shear resistance of elements with circular sections are found in the literature, as well as experimental tests for a better understanding of the contribution of concrete and reinforcements to the resistance against shear forces. In this context, the present study aims to analyze the performance of existing models for predicting the shear strength of reinforced concrete elements with both solid and hollow circular cross-sections, subjected to simple bending and composite bending. Additionally, the study seeks to analyze the effectiveness of using circular and spiral stirrups for this type of section. To achieve this, a database was constructed containing experimental tests from the literature of reinforced concrete elements with the aforementioned cross-sectional shapes. These results were compared with theoretical shear strength values predicted by selected models from available works, the model recommended by ABNT NBR 6118 (2014), and methods established by international codes and standards. In order to achieve a better interpretation of these results, a statistical analysis of the data will be conducted using descriptive statistics, along with graphical representation of the obtained values, with the aim of assessing the suitability of the models developed for designing the studied elements. Additionally, a parametric analysis will be carried out with the key parameters of the problem, investigating the influence of these variables on shear strength.

BANKING MEMBERS:
Presidente - 1120064 - SEVERINO PEREIRA CAVALCANTI MARQUES
Interno(a) - 072.485.254-99 - DAVID LEONARDO NASCIMENTO DE FIGUEIREDO AMORIM - UFS
Interno(a) - 1121792 - FLAVIO BARBOZA DE LIMA