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