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  1. johndeng

    Punching shear on slab

    @BulbTheBuilder Got you! so your numbers are base on the 1st picture. For the 1st picture, if the column only has moment, what's the punching load? my case is a post with 4 thru bolts (Top & bottom plates), not a concrete column
  2. johndeng

    Punching shear on slab

    @JoshPlumSE @BulbTheBuilder Thanks! Just want to be on the same page, assume the post is on the top of the slab, tension is on the bottom. I am still confused.
  3. johndeng

    Punching shear on slab

    Just the questions in my mind which could be simple to your talents, but I want to know it clearly myself. Thanks For example, the punching load on top of 8" slab, 1. if the slab horizontal reinforcement is 2" from top, what's the d value. 2. if the slab horizontal reinforcement is 6" from top...
  4. johndeng

    Wind corner zone

    @m7rhman Awesome! Didnt read thru new 7-16, thanks!
  5. johndeng

    Wind corner zone

    Hi maybe this is simple for you guys, but I want to confirm it's correct as I marked. There are some complicate building shapes, so I just thinking about this maybe helpful. Thanks
  6. johndeng

    Glass railing wind load at balcony

    @lexpatrie very useful, thanks! but it's for deck floor I imagine, not the open railing
  7. johndeng

    Glass railing wind load at balcony

    @rowingengineer Thanks @phamENG great you got a summary here, however, I dont understand what the conclusion is. Maybe it only tested one condition, i.e. when the balcony is 2m, and the building is high enough to have big wind speed, it should be designed as parapet. Correct me if I'm wrong. It...
  8. johndeng

    Glass railing wind load at balcony

    @phamENG You are genius! I have the question in mind for long, now it's solved. Thanks
  9. johndeng

    Glass railing wind load at balcony

    @phamENG to your wall c&c option, you mean only winward load to the railing, almost 0 leaward load on the back of railing? That's what I need to know. From code, I only know if the sign is hanging on the wall, the gap from the sign to the wall is small, only wall c&c is considered.for the sign wind
  10. johndeng

    Glass railing wind load at balcony

    @Eng16080 I dont think you can use "Solid Freestanding Walls and Solid Signs" per ASCE 7-16 since it's a main wind force resisting system, not c&c. C&C elements with tributary areas greater than 700 ft2 (65 m2) shall be permitted to be designed using the provisions for main wind force resisting...
  11. johndeng

    Glass railing wind load at balcony

    Yes glass railings have gap top and bottom, even the pickles railing has gap under bottom rail.
  12. johndeng

    Glass railing wind load at balcony

    Glass railing wind load at balcony is supposed to be the same as the parapet wind load design (both faces have load, positive from face of wall plus negative from roof/wall, say 100psf c&c). But the railing has 6" gap at bottom, is the wind load condition still the same as parapet? That's the...
  13. johndeng

    AISC DG29 Question

    (3) bolts double shear not enough for 66.7 kips
  14. johndeng

    Why the Bridge beam support looks different from the building beam at support

    @BridgeSmith, You are the expert! But I am a bit more confused. Is that the tall bearing is not for the thermal movements? Nowadays new bridges no longer use the tall bearings any more?
  15. johndeng

    Why the Bridge beam support looks different from the building beam at support

    Hi I only deal with buildings. When I pass by the bridges, I can see all the beams are sitting high above the abutments. It looks like some details to lift it up at the support bearing. What's the considerations? For building beams, it only sits on a thin bearing plate. Thanks
  16. johndeng

    two way slab middle strip reinforcement

    https://res.cloudinary.com/engineering-com/image/upload/v1713371326/tips/STR_lhjrhw.pdf Let me try the image link first
  17. johndeng

    two way slab middle strip reinforcement

    @rapt, You are right too, this is an old building, guessing 50ksi steel, not sure, here is the plan attached.https://files.engineering.com/getfile.aspx?folder=f9b0e416-84ea-42e7-a184-e028c94dbe25&file=STR.pdf
  18. johndeng

    two way slab middle strip reinforcement

    @BAretired, just follow up and what you said is correct. The other two engineers dont even understand the question. After we check CRSI and it clearly states the distribution of moment between column and middle strips for two way slab is NOT CRITICAL, as long the total area of reinforcement...
  19. johndeng

    two way slab middle strip reinforcement

    Hi it's actually the UPS Manhanton building. The top bar #5@20 is because the slab is 16" hollow block with 4" rib, only one top bar @ each rib. The bottom bar is 2#4 @ each rib. Yes it has expansion joints, probably 8 bays max each section.
  20. johndeng

    two way slab middle strip reinforcement

    No, the strength of the middle strip is way less than the loads as I said above. I repeated myself many times. The column strip is over design, and middle strip is under design, will the strength of column strip compensate for the middle strip. If not, how will the middle strip fail. This is an...

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