Estudo teórico-experimental do comportamento de nós de pórtico de concreto armado submetidos a ações cíclicas / Theoretical and experimental study of reinforced concrete frame joints behavior under cyclic load
AUTOR(ES)
Gerson Moacyr Sisniegas Alva
DATA DE PUBLICAÇÃO
2004
RESUMO
The present thesis studies the behavior of frame joints in reinforced concrete beam-column joints subjected to cyclic loads. The thesis is divided into two parts: an experimental study and a theoretical-based study. The experimental study is based on laboratory tests on five physical models of beam-column joints. The results of this experimental study permitted the observation of various aspects of the structural behavior of frame joint subjected to cyclic load and estimating the influence of certain variables the affect the behavior of such joints. In the present thesis, the variables studied are the applied load and reinforcement detailing at the joint location. The effects of cyclic loads on the tested joints were: an increase in the overall deformation, loss of strength and stiffness of structural elements, crack propagation and increase in crack width of previously formed cracks, a tendency towards a uniform strain distribution in the transverse reinforcement at the joint section and a more rapid deterioration of frame joints compared to beam/column joints. At the theoretical level, two types of models were used to study the behavior of the joint: i) a model derived from the idealization of the classical strut-tie model, and ii) a simplified damage and fracture mechanics-based model for estimating the effects of the loss of stiffness (damage) and permanent strains (plasticity) on the overall response of the beam column joint. To reach any conclusion on the mechanical behavior and the efficiency of existing theoretical models employed in the design of reinforced beam-column joints and other joints subjected to cyclic loading, a comparative study between the theoretical and experimental results was carried out. The results show that within certain limits, the theoretical models employed are in good agreement with experimental results
ASSUNTO(S)
beam-column joint ligações viga-pilar ações cíclicas nós de pórtico cyclic load concreto armado frame joint damage mechanic dano
Documentos Relacionados
- Theoretical-experimental analysis of the influence of normal force on the exterior reinforced concrete joints behavior
- Estudo teórico-experimental da influência das cargas cíclicas na rigidez de vigas de concreto armado
- Analise teorico-experimental de portico-treliça de madeira
- Estudo teórico-experimental da ligação entre pilares mistos preenchidos e vigas pré-moldadas de concreto
- Theoretical and experimental study of high strength concrete filled steel tubes