The new ACI 318-19 shear equations: main changes and a feasible mechanical interpretation.

The American Concrete Institute (ACI) has just launched the new code ACI 318-19 with a new equation for the concrete contribution to the shear strength. This video comments the most important changes and presents a possible mechanical interpretation to this new equation. This interpretation is not exclusive and this video does not represent the official ACI point of view.

A new paper published ACI Structural Journal explains the development of this new equation:

Kuchma, D. A., Wei, S., Sanders, D. H., Belarbi, A., & Novak, L. C. (2019). Development of the One-Way Shear Design Provisions of ACI 318-19 for Reinforced Concrete. ACI Structural Journal, 116(4). Link to International Concrete Abstracts Portal: https://www.concrete.org/publications...

The mechanical interpretation given in the second part of the video is based on the Compression Chord Capacity Model (CCCM). More information regarding this model can be found at the following references:

Marí, A., Bairán, J., Cladera, A., Oller, E., & Ribas, C. (2015). Shear-flexural strength mechanical model for the design and assessment of reinforced concrete beams. Structure and Infrastructure Engineering, 11(11), 1399-1419. Available at: https://doi.org/10.1080/15732479.2014...

Cladera, A., Marí, A., Bairán, J. M., Ribas, C., Oller, E., & Duarte, N. (2016). The compression chord capacity model for the shear design and assessment of reinforced and prestressed concrete beams. Structural concrete, 17(6), 1017-1032. Available at: https://doi.org/10.1002/suco.201500214

Cladera, A., Marí, A., Bairán, J. M., Oller, E., & Ribas, C. (2017). One-way shear design method based on a multi-action model. Concrete International, 39(9), 40-46. Available at: https://www.concrete.org/publications...

The Compression Chord Capacity Model has been developed by researches from the Technical University of Cataluña (UPC) and the University of the Balearic Islands:
Antonio Marí (UPC)
Antoni Cladera (UIB) - Twitter: @ToniCladera3
Jesús Miguel Bairán (UPC)
Carlos Ribas (UIB)
Eva Oller (UPC)
Noemí Duarte (UPC)

Video recorded by: Servei de Recursos Audiovisuals (UIB)
Edition: Imalay Vilar (UIB)