This video explains the reason why stirrups are installed in concrete beams. The video begins with a generic explanation of the bending and shear loads that beams are usually subjected to. Beams have different mechanisms for resisting these types of loads. Each load causes different types of stress whose combination presents a unique challenge. The explanation concludes with the crack development process and principle stresses that are key for the propagation of the crack.
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References:
[1] ASCEACI Committee 426, "The Shear Strength of Reinforced Concrete Members," Journal of Structural Division, vol. 99, pp. 10911187, 1973.
[2] S. Brzev and J. Pao, "Shear Design of Beams and OneWay Slabs," in Reinforced Concrete A Practical Approach, Toronto, Prentice Hall, 2009, pp. 260315.
[3] J. M. Gere and B. J. Goodno, Mechanics of Materials, Cengage Learning, 2013.
[4] N. E. Dowling, "7 Yielding and Fracture under Combined Stresses," in Mechanical Behaviour of Materials: Engineering Methods for Deformation, Fracture, and Fatigue, London, Pearson Education Limited, 2013, pp. 275333.