Abstract
This research is devoted to investigate the experimental and theoretical behavior of deep beams under monotonic two points loading. An experimental program examining six RC deep beams is carried out. The investigated parameters include shear span to depth ratio varying from 1.0 to 0.276. A comparative study is conducted in this paper by using finite element software ANSYS. The experimental and numerical results show that concrete strength and shear span to depth ratio are the two most important parameters in controlling the behavior of RC deep beams. Comparison of experimental results was made with corresponding predicted values using the Strut and Tie procedure presented ACI 318M-11Code and with other procedures mentioned in the literature. It was found that the Strut and Tie procedure presented in ACI 318M-11Code give conservative results as compared with the experimental tested results. The results showed reliability of analysis in predicting deep beams behavior in terms of failure load, failure mode as well as crack propagation.
Highlights
Reinforced concrete (RC) deep beams are structural members for which the load is applied at a distance from the support so that a substantial proportion of the load is transferred directly to the support by arching action
The results show that shear capacity of deep beams increases with increasing concrete compressive strength, and this enhancement is more pronounced for beams with smaller shear span-depth ratios
On the basis of the experimental and theoretical results presented in this study and the assessment of different design approaches, the following conclusions can be drawn: 1. As a/d ratio, reduces the arch action becomes more dominant whereby loads are transferred directly by arch in compression
Summary
Reinforced concrete (RC) deep beams are structural members for which the load is applied at a distance from the support so that a substantial proportion of the load is transferred directly to the support by arching action. As the shear behavior of RC members is still not well understood and is influenced by many parameters, existing design models rely on empirical equations [3, 4]. Even though such approaches are generally extremely conservative, [5,6,7,8] they can lead to unsafe design solutions [8,9,10]. Such concrete should have a relatively low yield value to ensure high flow ability, a moderate viscosity to resist segregation and bleeding, and must maintain its homogeneity during transportation, placing and curing to ensure adequate structural performance and long term durability [12]
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