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  • Users: Agbsh
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  1. Agbsh

    Concrete Span Definition for Shear

    Almost the exact text is still there in §9.4.2 & 9.4.3. Also, the commentary of 9.4.3 has a few graphic explaining/discussing the text.
  2. Agbsh

    ACI 318-19 "additional" (?) ductility requirements for ASTM A615 and A706 Rebar

    Forget to mention, there are still some values in the ACI 318-25 appendices (as an option).
  3. Agbsh

    ACI 318-19 "additional" (?) ductility requirements for ASTM A615 and A706 Rebar

    Those tables/values were missing in older versions of ASTM A706-16 and A615-18, hence ACI added them. Newer versions elaborate on those limits, that why we do not see those tables in ACI 318-25, with one exception for Supp. S1 which is not mandatory for A706, unless purchaser ask for (related to...
  4. Agbsh

    Cracked section properties for wind load analysis

    @milkshakelake it is S22, assuming local axis 2 is vertical (default setting).
  5. Agbsh

    Cracked section properties for wind load analysis

    You run two independent models, one for ultimate load combinations to design lateral elements, in which the level of cracks are based on one of the 3 methods prescribed in chapter 6 (ACI 318). For service load combinations which will be needed for drift, the factors allowed to be increased by...
  6. Agbsh

    MWFRS & C&C

    Treat each story differently, the bottom enclosed building (internal coefficient ±0.18) and the top story as an open building with (internal coefficient =0), see Figure 28.3-3 in ASCE 7-22. The second floor seems to me a concrete slab? so rigid diaphragm, consider torsion. The roof seems to be...
  7. Agbsh

    Interesting situation in Etabs dead load moment diagram

    Could you press (Ctrl + W), tick "end release" at section properties, Ok and show screenshot? To me the beam with negative moment have unreleased end (at least for major axis, M3 in ETABS assuming default local axis definition).
  8. Agbsh

    Footing Top Steel

    @human909 Maybe you will enjoy this! https://www.researchgate.net/public...atterns_and_Spoke_Fatigue#fullTextFileContent
  9. Agbsh

    Wind Suction Overturning Moment for Container Foundations

    All the loads should be considered simultaneously for stability check. If it enclosed, with flat roof, will develop negative pressure. ASCE 7 gives leeward coefficients as a function of length to width, and roof pressure as a function of height to length (the length is parallel to the wind...
  10. Agbsh

    Under-reinforced beam

    "Ultimate Limit State".
  11. Agbsh

    Tension Only Bracing - Single Angles

    The effective length (kz) is 0.85 times the half diagonal length considering the radius of gyration in the z-axis, rz and (kx = ky = 1.0) times half length in rx and ry (see screenshot from El-Tayem and Goel). All the three limits (0.85 * (L/2) /rz), (0.85 * (L/2) /rx) and (0.85 * (L/2) /ry) to...
  12. Agbsh

    ASCE 7 22 Supplement 2

    It makes uplift check more sense though (0.9 Dead vs 0.6 now and fluid either 0.75 or 1.5), however, with changing MRI, results maybe will be worse than current combinations to check uplift. I tried to use it to design hydrostatic slab, but I thought will be difficult to convince Building...
  13. Agbsh

    Wind corner zone

    For interior reentrant, wind separation is far from happening, so no need for zone 5 (or 3 for the roof). See Figure C30.3-2, ASCE7-22 and read the commentary, it is explains and summarizes it nicely. Same Figure in ASCE 7-16 too.
  14. Agbsh

    Wind Loads for Open Buildings of All Heights

    First question, you may refer to BS 6399-2 Wind British Standard (I added few screenshots). Second question, the two cases are coming from enveloping wind tunnel results. ASCE 7 copy values from Australia/New Zealand wind code, British standard gives very close results. (Edit: remember those...
  15. Agbsh

    ACI 9.7.6.4.1 - Compression Bar Confinement

    Beams could have a compression force (beam-column action) typically when it is part of diaphragm and acts as collector or chord for lateral loads (which typically will have the force as tension or compression depending on the direction of the applied lateral loads). In such case the beam...
  16. Agbsh

    ETABS Ultimate C 21.0.0 Beam Design using ACI-318-14

    Check if the difference is due to torsion. The beam will see torsional load as it sit on the edge (slab moment will act as torsion on the beam). You can see the torsion reinforcement separately from >> Concrete Design >> Beam design.
  17. Agbsh

    Concrete Spring Constant Calculation

    I think this is coming from the concrete crushing strain taken to be 0.003 by ACI. See the original presentation here (about 10 minutes from beginning, he didn’t go in detail though) https://youtube.com/watch?v=x_P1EezPXGI&feature=youtu.be It’s a good presentation.
  18. Agbsh

    Punching shear check ACI 318-14 vs ACI 318-19

    Notice that there is an exemption from size factor for shallow foundation as there is no failure reported and they benefit from redistribution of soil pressure (based on FAQ from ACI or something similar they published before). The section 13.2.6.2 in ACI 318-19 reads:"For one-way shallow...
  19. Agbsh

    C&C roof mechanical louver doors

    For walls there are zone 4 and 5 (corner) for C&C. The door/wall is not part of the roof pressure (horizontal surface). As you know, C&C is influenced a lot by effective area (max of either tributary area or span*span/3). In your case this is 285 square foot. This area is not small and maybe...

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