A Finite Element Method Based Analysis of Corbels

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Date

2016-11

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Addis Ababa University

Abstract

In view of the increasing need of industry and infrastructure these days, finding the structural element that capable of transferring high load are critical. Corbels are widely used in concrete structures in view of the advantages such as transferring high load to the supporting. Yielding of tension tie, failure of end anchorage of the tension tie, failure of concrete by compression or shearing and bearing failure are the main contribution to failure of reinforced concrete corbels. Thus, stress analysis and parametric study has become popular as an area of research on corbels to minmize the failure and optimal design of corbels. This thesis presents a parametric study of the behavior of reinforced concrete corbels using finite element analysis software ANSYS. The parameters taken into consideration has been geometry of a corbel (width, thickness, outside edge depth and shear span to effective depth ratio), concrete strength, reinforcement ratio, loading condition (uniform, line and concentrated load) and type of modeling (2D and 3D). These variables have been used to conduct a series of finite element analyses for the purpose of achieving the objective of this thesis. Finally, the result obtained from the finite element analysis has been presented and compared with a strut and tie model. Conclusions were then made concerning the effects of adjusting the parameters of the model. By increasing thicknesses, width, and outside edge depth of RC corbels, both the deflection and the principal stress have been reduced. As the shear span to effective depth ratio increase, the deflection and principal stress also increased. Corbels subjected to loading condition varies from uniformly distributed to concentrated, there were a significant reduction in the principal stress. And also the results showed that modeling using two dimensional approach gives lower values of stress and deflection than a full three dimensional model. A comparison of principal stress showed that the solutions based on finite element analysis deviated slightly from the strut and tie model. Key words: Corbels, Finite Element, Strut and Tie Model

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Keywords

Corbels, Finite Element, Strut and Tie Model

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