Thank you so much for this video, am actually using seismosoftware to analyze my building model with regard to earthquakes through the pushover analysis
For a reasonably high house the walls are enough. But for a high rise building or an earth-quake safe building then the pillars are also important, especially if you want to control the resonance frequency of the building.
U r really awesome... ur work or presentation is always on point and u have made structural design very very easy to understand. On the flip side, I have this live project (B+G+2+R) ongoing in the middle East as a project engineer. Join me on UT as I present daily activities of the project. Ur views, observations and questions will be appreciated. Thanks
Thank you Tyler , really ur videos helps a lot, am studying ICC now n I passed the code exam n now preparing for plan exam , can u help me shearing void how to read the plan ( the basics) thanks a lot
Howdy Dr. Ley, From my readings, I always assumed that tributary area was only used for flexible diaphragms, and for rigid diaphragms, the lateral loads were by proportion of the wall stiffness. I noticed you didn't really dig deep into the diaphragms role in this video. Any chance you could make one? Thanks!
Would be interesting to see more dynamic loads on a building, for example explosive, or impact loads (vehicle/aircraft crash) - for structure survivability. Your first diagram reminded me of the structure failure report of the Murrah Federal Building in Oklahoma City. What about static loads underground, and dynamic (seismic?) adversarial loads (landslides, settlement)? Kind of along those lines, what about base-isolation (like a triple-pendulum style isolator)? Given the geopolitical climate, it's a topic of interest to me. I have a lot of books on good building security design, but everything seems to leave the structural design work to some nebulous structural engineer we're supposed to conjure from our 6 o'clock...
i just watched some fema videos on structure assessment after destruction by tornados. many reinforced cmu walls failed at the base where rebar passed up into the grout columns. basically the walls failed as a unit and fell over, leaving 8-12 inches of rebar sticking out of the ground. are these failures preventable with longer rebar poking out of the slab into the grout column or was the grout/rebar bond just too weak. the grout used seems very soupy with a slump of 8--is this the source of the weakness problem or is the rebar just inadequate.
Great video. IMO, I wouldn't put all the lateral loads on the wall because I will not be able to detect the torsional behavior of the entire structure subjected to wind or earthquake loads.
For the case that was shown in the video I totally agree with your comment. However. as long as the center off stiffness of the structure is near enough from center of mass, this torsional effect can be reduced; and this can be achieved by making a symetric structre in terms of stiffness... You can even design a structure whose walls absorb more than 80% of the applied lateral loads as long as it is symetrical enough to reduce torsional effects.
Undoubtedly a critical metric was under specified. The West Seattle Bridge concrete is cracking and all surface traffic stopped. How quickly can steel post tensioning fail when suspended above marine salt water? Surely not less than 10 years when the bridge designer expected 50 years of service life. Undoubtedly a critical factor was in error. Please list the most likely factors which will produce early failure of tensioned structures like a tall bridge on pier columns with the road slabs post tensioned. 1) Wind stresses exceeded steel tensioning allowing movement resulting in Concrete cracking? 2) Support columns under sized allowing to much movement? Or 3) Concrete mix did not withstand freeze-thaw cycling? Or ???
I want to absorb this knowledge like a sponge,.........only problem is my brain is a dripping wet sponge with 50 years of ideas this has to percolate thru.
"you can economically build building with walls", all those stupid people who thought they were buying shelter, they just get the free side product of stiffness!
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Thanks Tyler, You're truly a professor and a professional. Amazing teachings!
Done with application at your university you have motivated me. You so inspiring...
Great explanation, thank you very much! Now I understand clearly how shearwalls work.
I love your passion for your field.
Thank you i like to watch all of your lessons
Thank you so much for this video, am actually using seismosoftware to analyze my building model with regard to earthquakes through the pushover analysis
Amazing teaching professor!!
Wow! Fantastic video, thank you very much professor.
For a reasonably high house the walls are enough. But for a high rise building or an earth-quake safe building then the pillars are also important, especially if you want to control the resonance frequency of the building.
Citicorp building a case in point........
U r really awesome... ur work or presentation is always on point and u have made structural design very very easy to understand. On the flip side, I have this live project (B+G+2+R) ongoing in the middle East as a project engineer. Join me on UT as I present daily activities of the project. Ur views, observations and questions will be appreciated. Thanks
Really mant thanks prof my suggestion Demonstration the same issue on circular tank
Is gonna be good issue
Thank you Tyler , really ur videos helps a lot, am studying ICC now n I passed the code exam n now preparing for plan exam , can u help me shearing void how to read the plan ( the basics) thanks a lot
Howdy Dr. Ley,
From my readings, I always assumed that tributary area was only used for flexible diaphragms, and for rigid diaphragms, the lateral loads were by proportion of the wall stiffness. I noticed you didn't really dig deep into the diaphragms role in this video. Any chance you could make one? Thanks!
Great video, thanks!
Would be interesting to see more dynamic loads on a building, for example explosive, or impact loads (vehicle/aircraft crash) - for structure survivability. Your first diagram reminded me of the structure failure report of the Murrah Federal Building in Oklahoma City.
What about static loads underground, and dynamic (seismic?) adversarial loads (landslides, settlement)? Kind of along those lines, what about base-isolation (like a triple-pendulum style isolator)?
Given the geopolitical climate, it's a topic of interest to me. I have a lot of books on good building security design, but everything seems to leave the structural design work to some nebulous structural engineer we're supposed to conjure from our 6 o'clock...
Brilliant 😍
May i know the software you recommend please
i just watched some fema videos on structure assessment after destruction by tornados. many reinforced cmu walls failed at the base where rebar passed up into the grout columns. basically the walls failed as a unit and fell over, leaving 8-12 inches of rebar sticking out of the ground. are these failures preventable with longer rebar poking out of the slab into the grout column or was the grout/rebar bond just too weak. the grout used seems very soupy with a slump of 8--is this the source of the weakness problem or is the rebar just inadequate.
6:56 Your wall is actually two bays deep against the wind load in plan, not one as shown in elevation.
Can you cast a two way slab in two stages like after the first half is hardened then the other
Great video. IMO, I wouldn't put all the lateral loads on the wall because I will not be able to detect the torsional behavior of the entire structure subjected to wind or earthquake loads.
For the case that was shown in the video I totally agree with your comment. However. as long as the center off stiffness of the structure is near enough from center of mass, this torsional effect can be reduced; and this can be achieved by making a symetric structre in terms of stiffness... You can even design a structure whose walls absorb more than 80% of the applied lateral loads as long as it is symetrical enough to reduce torsional effects.
I'm designing a concrete home for myself in Montana 30x40 with large cantilevered roof. If you want to do a collaborative build
sir how to calculated shear capacity of floor?
Undoubtedly a critical metric was under specified. The West Seattle Bridge concrete is cracking and all surface traffic stopped. How quickly can steel post tensioning fail when suspended above marine salt water? Surely not less than 10 years when the bridge designer expected 50 years of service life. Undoubtedly a critical factor was in error. Please list the most likely factors which will produce early failure of tensioned structures like a tall bridge on pier columns with the road slabs post tensioned. 1) Wind stresses exceeded steel tensioning allowing movement resulting in Concrete cracking? 2) Support columns under sized allowing to much movement? Or 3) Concrete mix did not withstand freeze-thaw cycling? Or ???
👍✌
What about seismic loads?
I want to absorb this knowledge like a sponge,.........only problem is my brain is a dripping wet sponge with 50 years of ideas this has to percolate thru.
Aaah lateral loads. My weakness.
"you can economically build building with walls", all those stupid people who thought they were buying shelter, they just get the free side product of stiffness!
Second
First ...
yes .. it's infantile ... but I've never done it before.
@Wroger Wroger I can neither confirm or deny that self touching took place. (I totally bought myself flowers.)
wind
Are you always this hyper?
Cocaine is a wonderful drug! j/k