ABSTRACT
Research on shear in reinforced concrete has been carried out for about a century, so there are many published papers in existence related to this subject. 
With the arrival on the market of new materials, such as Fiber Reinforced Concrete (FRC), studies began to focus on the shear behavior of elements made of this material.
The present thesis tries to shed some new light on the shear behavior of FRC elements by means of a thorough analysis of the most important studies in order to detect any deficiencies or issues that have not yet been examined.
Many researchers have presented new formulas for evaluating shear resistance and have compared them with others already in existence.
This thesis does not propose a new formula to add to the already long list, but the objective is to verify the reliability of the current codes by means of comparing experimental tests. 
One of the issues dealt with was to verify the influence of flange size on shear and whether to include the flange factor in the design formulas (it appears in one shear formulation for FRC elements, but not in those for non-fiber elements). 
Tests were also performed on beams made of concrete of different compressive strengths and fiber reinforcements (quantity and quality) to study their influence on shear, including the size effect.
Finally, FRC hollow core slabs were produced to achieve the benefits of fibers under shear forces, due to the impossibility of including transverse reinforcement in this type of slab.