Shear Capacity of Reinforced Concrete Beams using ACI 318-19

Ғылым және технология

Shear capacity of reinforced concrete beams has changed from ACI 318-14 to the latest code edition, ACI 318-19. The detailed method is no more, and significant changes have been made the concrete term Vc.
This video gives an overview of shear in reinforced concrete beams, highlights the changes in the concrete Vc term, and reviews the steel stirrup contribution Vs. Two example problems are completed: the first for a beam with less than minimum transverse reinforcement, and the second for a beam with more than the minimum transverse reinforcement.
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This video is in US units (inches, pounds, and psi), but here are the conversions to SI units (millimeters, Newtons, and MPa):
Converting equations for Vc in Section 22.5.5 from psi to MPa (2:44) - change the 2 coefficient to 0.17 and change the 8 coefficient to 0.66
Converting Av,min in Section 9.6.3.4 from psi to MPa (2:44) - change the 0.75 coefficient to a 0.062 and change the 50 coefficient to 0.35
Converting size factor lambda,s from Section 22.5.5.1.3 from inches to millimeters (5:20) - equation becomes sqrt(2/(1+0.004d))
All the steel strength equations are the same - obviously you'll have the stirrup Av in square millimeters and the steel strength fy in MPa.
If you want to convert my numbers from the examples (these are the only US to SI conversions you'll basically ever need for any strength calculations)...
1 MPa = 145 psi (so the 5000 psi concrete is 35 MPa),
25.4 mm = 1 inch (so the 24-in deep beam is 610-mm deep),
and 4.45 Newtons = 1 pound or 4.45 kN = 1 kip (so the Example 1 design capacity of 24 kips is 107 kN).
Rebar are specified differently, but a #3 rebar is very close to a 10M (10-mm diameter) bar and a #8 bar is very close to a 25M (25-mm diameter) bar.
Chapters:
0:00 Introduction
2:40 Concrete Vc
6:08 Steel Vs
7:57 Example 1
11:31 Example 2

Пікірлер: 17

  • @fadi747
    @fadi7472 ай бұрын

    I encourage you to add more tutorial videos related to the new ACI 318-19 code in the future. Your videos are very helpful and easy to understand.

  • @erikw3541
    @erikw3541 Жыл бұрын

    I was having a hard time finding this information in ACI 318-19, and this was the perfect video for me. Would love to see more videos diving into ACI. I have also been enjoying watching your other videos!

  • @StructuresProfH

    @StructuresProfH

    Жыл бұрын

    Glad you enjoyed it!

  • @josellvasquez9340
    @josellvasquez93408 ай бұрын

    Great contribution! Thanks for sharing the code with examples!

  • @StructuresProfH

    @StructuresProfH

    8 ай бұрын

    You're welcome!

  • @michaelsabbagh2673
    @michaelsabbagh26735 ай бұрын

    Thanks prof. For this useful video. Is it possible you can a video on pile caps as the size reduction has a major impact due to the large depth of pile caps. Pile caps designed using aci 318-14 and aci 318-19 are having a major change in depth.

  • @sandeepwale
    @sandeepwale Жыл бұрын

    thanks

  • @StructuresProfH

    @StructuresProfH

    Жыл бұрын

    You're welcome!

  • @fadi747
    @fadi7472 ай бұрын

    How did you compute Av min (at 8:35 of this video).

  • @nontawadkusonsin2562
    @nontawadkusonsin2562 Жыл бұрын

    Thanks. Pro.H Please make video doubly reinforced.

  • @abdallamahzouz9179
    @abdallamahzouz9179 Жыл бұрын

    Thanks Dr Please advise me what is the best book to can learn design y ACI 318 easily and fast?

  • @StructuresProfH

    @StructuresProfH

    Жыл бұрын

    My favorite text book on the topic is Reinforced Concrete Design by Pincheira, Parra-Montesinos, Wang, and Salmon. The 9th edition covers the most recent ACI 318-19.

  • @bekasbekas764
    @bekasbekas764 Жыл бұрын

    Thanks . please make video about moment inertial concept in reinforcement concrete design

  • @StructuresProfH

    @StructuresProfH

    Жыл бұрын

    Do you mean moment of inertia? I have two already! Uncracked sections (gross versus transformed MoI): kzread.info/dash/bejne/dalhr9qEpZjdZZc.html Cracked sections (cracked MoI): kzread.info/dash/bejne/l52ulLOiZrW9pLA.html

  • @abuibrahim6912
    @abuibrahim691221 күн бұрын

    I hope if it's in SI unites 😢

  • @StructuresProfH

    @StructuresProfH

    20 күн бұрын

    I can help with that. The equations are all the same for SI units except for the following exceptions. Here are the conversions from psi to MPa and inches to millimeters, with the video timestamps included... Converting equations for Vc in Section 22.5.5 from psi to MPa (2:44) - change the 2 coefficient to 0.17 and change the 8 coefficient to 0.66 Converting Av,min in Section 9.6.3.4 from psi to MPa (2:44) - change the 0.75 coefficient to a 0.062 and change the 50 coefficient to 0.35 Converting size factor lambda,s from Section 22.5.5.1.3 from inches to millimeters (5:20) - equation becomes sqrt(2/(1+0.004d)) All the steel strength equations are the same - obviously you'll have the stirrup Av in square millimeters and the steel strength fy in MPa. It's a bit more work to convert the examples, but the process is identical except with the small equations changes above. If you want to covert my numbers... 1 MPa = 145 psi (so the 5000 psi concrete is 35 MPa), 25.4 mm = 1 inch (so the 24-in deep beam is 610-mm deep), and 4.45 Newtons = 1 pound or 4.45 kN = 1 kip (so the Example 1 design capacity of 24 kips is 107 kN). Those are the only US to SI conversions you'll basically ever need for any strength calculations. Rebar are specified differently, but a #3 rebar is very close to a 10M (10-mm diameter) bar and a #8 bar is very close to a 25M (25-mm diameter) bar.

  • @abuibrahim6912

    @abuibrahim6912

    19 күн бұрын

    @StructuresProfH thank you

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