Percorrer por autor "Sadieh, Saffana"
A mostrar 1 - 1 de 1
Resultados por página
Opções de ordenação
- Modeling the Envelope Curves of Reinforced Concrete Membrane Elements under Cyclic ShearPublication . Sadieh, Saffana; Bernardo, Luis Filipe AlmeidaShear walls and shell type reinforced concrete structures can be viewed as a combination of smaller two-dimensional membrane elements, or panels. It is possible to predict the global behavior of the referred structures under cyclic loadings by predicting the individual behavior of the membrane elements (panel elements). To predict the full response of structural concrete panel elements under in-plane monotonic stresses, a smeared truss model based on a modified version of the rotatingangle softened truss model (RA-STM) was proposed in earlier studies. Known as the "efficient RA-STM procedure", this model was validated against experimental results of various types of reinforced and prestressed concrete panels, and was proven to provide high numerical efficiency and stability. The model incorporates equilibrium and compatibility equations, in addition to smeared constitutive laws for the materials. The equations were implemented with an efficient algorithm to carry out the calculation procedure, and compute the solution points without using the classical trial-and-error technique. In this study, the effective RA-STM procedure is revised, and its predictions are compared to an experimental study found in literature. The study involves a set of reinforced concrete panels tested under in-plane cyclic shear until failure. The predictions from the model are compared against the experimental envelope curves of the hysteretic shear stress-shear strain loops. It was shown that the predictions for the shape of envelope curves (at least until the peak load is reached), and for the important key shear stresses (namely, cracking, yielding, and maximum shear stresses) are in a reasonably good agreement with the experimental envelopes. Based on these results, it can be concluded that the efficient RA-STM procedure can be considered a good and reliable model to predict a number of significant characteristics of the response of reinforced concrete panels under cyclic shear, at least up until the peak load Is reached, and can be used for predesigning or precheck analysis.