How can the design diaphragm force and design shear force be different for the roof of the steel building? The diaphragm design force is 394 kips and and story shear is 231 kips. But the roof diaphragm is only acted on by the story below, so where are the extra 163 kips that are acting on the diaphragm coming from?
@@dirkbondy 👍👍👍👍Thank you so much...i can not express how much my feelings is great when heard it..especially dynamic push over example on evaluating strength of existing bulding..i really can not wait till next month 😁 ...so exited so...thank you so much...
Hi Ibrahim, I'm not sure what you are asking. I don't think I said in the video that the vertical distribution is not real. Did I? If I did I apologize. It's all very real.
Per "higher mode effect", professor are you referring to the higher modes (with small participation factor and modal mass) or the higher modal period (1st mode typ)? Thanks!!!
@@dirkbondy Mr. Bondy, I'm confused about how the design diaphragm force and design shear force can be different for the roof of the steel building? The diaphragm design force is 394 kips and and story shear is 231 kips. But the roof diaphragm is only acted on by the story below, so where are the extra 163 kips that are acting on the diaphragm coming from?
@@ryanfleming3091 Unfortunately, we engineers are forced to use the building code specified minimum forces blindly UNTIL they are changed. Look at the bright side, every time new edition building code comes out, there will be wave of new projects!
As a mechanical engineer, this video explained to me what took over 10 hours of research. Thank you very much!
Why do we put extra force on top to account for higher modes? why at top specifically?
Keep it up
What should we do if anoying Fp(minimum) calculates 7-8 times over Fp ?
How can the design diaphragm force and design shear force be different for the roof of the steel building? The diaphragm design force is 394 kips and and story shear is 231 kips. But the roof diaphragm is only acted on by the story below, so where are the extra 163 kips that are acting on the diaphragm coming from?
Well done sir 👏👍
so great explenation....ı hope to see your next videos on pushover and time history analaysis...
I'm working on the pushover right now. It should be published in the next month or so.
@@dirkbondy 👍👍👍👍Thank you so much...i can not express how much my feelings is great when heard it..especially dynamic push over example on evaluating strength of existing bulding..i really can not wait till next month 😁 ...so exited so...thank you so much...
Sir please do notes, graph, I am confused here 37:00
is your accompanying book available for the public as well?
Thank you so much for this clear description of Diaph. force analysis!!
You're welcome!
Now I am sure that you can survive the first wave of zombie dirk......
than you for this video but i still cant understand why vertical distribution was not real ... can you explain this ?
Hi Ibrahim,
I'm not sure what you are asking. I don't think I said in the video that the vertical distribution is not real. Did I? If I did I apologize. It's all very real.
Per "higher mode effect", professor are you referring to the higher modes (with small participation factor and modal mass) or the higher modal period (1st mode typ)? Thanks!!!
Hi Darth, By "higher modes" I am referring to the 2nd, 3rd, 4th modes, etc. As you stated, the ones with smaller modal mass participation.
@@dirkbondy Mr. Bondy, I'm confused about how the design diaphragm force and design shear force can be different for the roof of the steel building? The diaphragm design force is 394 kips and and story shear is 231 kips. But the roof diaphragm is only acted on by the story below, so where are the extra 163 kips that are acting on the diaphragm coming from?
Hi Ryan, The 394 kips is the minimum diaphragm force required by the code for this case, regardless of the actual force calculated.
@@ryanfleming3091 Unfortunately, we engineers are forced to use the building code specified minimum forces blindly UNTIL they are changed. Look at the bright side, every time new edition building code comes out, there will be wave of new projects!
Thank you so much.
thank you so much
Love from Pakistan
What an elaborate lecture, you couldn’t have done it better. Well done Sir🙏🙏🙏🙏
I request for an entire set of notes, how may I get them please.
thats why we are better than anybody else, hehehe😆