Example for calculations of seismic loads through a basic box structure. Only the primary elements are computed here, assuming a wood-framed structure with flexible roof diaphragm.
I am an Aerospace Engineer working a unique Civl Engineering project with seismic assesment requirements and found your lecture very informative and straightforward to understand, thank you very muc for your contribution for us in the technical world!
Excellent article, congratulation, Could you give a lecture of Example for calculation of seismic loads for a conventional valve., like Globe valve as it may be useful for valve enginers
excellent! I really enjoyed it, very clear presentation. @ 20.08 for wind loads, you had mentioned the wind loads be the same. But the wall length are different, can you comment on that? @ 4.52, would the weight be the same if it were wind loads, 1/2 of 2-walls plus roof weight? thanks
Thanks...glad it was helpful. The wind load *pressure* is assumed to be the same in all directions. The total wind *force*, however, depends on how long the wall is to accumulate that pressure. For the second question, the wall and roof dead loads are what generate the seismic forces in a building by virtue of their inertia. Wind loads in contrast act externally to the wall, so the wall weights are not part of load computation.
Sorry, that's a question outside the scope of things here. I make these specifically for my students in architecture but post them here for general info. The process here also is using older code provisions that have been superseded. The basic principles would be the same for a storage tank, though, that seismic forces come from inertial mass of whatever is being stored in the tank. I suggest you look at other more technically-based structures links. Dr. Structure here on TH-cam might be a good place to start.
Hi professor Deb. Do you have an example for designing cast-in-drilled-hole (CIDH) steel reinforced concrete piers? I have software to design the pier itself, but not sure how to establish horizontal seismic force for each pier (lateral loads near slopes already provide by my Geotech). I was proposing that I could take the tributary total dead load and simply multiply it by the calculated base shear factor of approximately .14W here in California zone 4. This is for my own residential foundation repair design. Thanks so much ! Ted
Hi Ted...sorry no, that's really outside the scope of the type of videos I make for my students. For a real project on your own house subject to the seismic loads you really need to consult with a licensed structural engineer. So much depends on the soil type of your foundations as well as the dead load of the house. 14% of your dead load may or may not be high enough for your location. The resonant interaction between the natural periods of vibration of the building and soil are a critical concern. Designing for seismic resistance is NOT a do-it-yourself job! This is not to even mention the necessary anchors and straps required throughout the house to maintain a continuous load path from the roof to the foundation.
I am new to the structural analysis. Roof DL (North-South) should be calculated 15 psf * 1 ft (12" strip a.k.a tributary width) which indicates the linear load along 60' long section?
I'm not quite sure if that's a question or a statement. If it's a question, maybe you could rephrase it as I'm not quite sure what is being asked. The loads computed in the N-S direction are those that accumulate (plus the wall DL) along the 100' width of the building, That force is then in turn resisted the the exterior N-S walls on the east and west faces that carries it to the foundation,
Professor how do i find the earthquake load that we put in to load the combination equation is that the base shear value or the resultant value of all floor or each story? which value do I use to check the earthquake load combination? Thanks.
In multistory structures the base shear is the total due to the inertial forces accumulating from top to bottom of the structure. This base shear then gets distributed to each level of the structure as a percentage of the total. Codes have a formula for that that also consider the mass of each floor level and period of vibration, all of which is beyond the scope of what I cover here in this basic example.
This is based on an old code in the United States (the Uniform Building Code of 1998), which is quite simplified from current codes. The intent of this example is to explain the basic principle of how seismic loads are generated and move through a structure without getting overly complex.
I am an Aerospace Engineer working a unique Civl Engineering project with seismic assesment requirements and found your lecture very informative and straightforward to understand, thank you very muc for your contribution for us in the technical world!
Thank you so much. Made for my basic architectural structures class, but glad it was helpful for you!
Please continue for more examples
Well laid out and clearly explained. Please try to upload more educational videos.
Amazing, clear and to the point explanation. Thank you @professordeb!
Thank you Proffesor. Best explanation On the Internet.
Thank you so much...glad it wad helpful. 😊
Very good, simple way to explain how to get the forces. Thanks!
Wonderful presentation.
This helped me so much at work, thank you!!
This video was everything I was looking for and more. Awesome job explaining everything!
Glad it's helpful!
Beautiful calculator
Thank you....One of the most iconic calculators, the venerable HP 11C! Been using it since the early '80s.
Excellent explanation Maam
Thank you for this great Video Professor
You’re welcome...glad it was helpful.
Thank you for uploading this video! Very clear and easy to follow.
thanks a ton maam, more power to you from india
Well Expalined for Structural Engineers!
Thanks, that was a great and clear video, I certainly learnt
GREAT THANKS, PROF. DEB. COULD YOU PLEASE EXPLAIN TO US THE DISTRIBUTION OF SEISMIC LOADS ON STORAGE TANKS, THANKS A LOT
This was a very good video. Excellent step-by-step explanations with clear diagrams. Thank you!
Thanks...glad it was helpful.
nice presentation
Excellent article, congratulation, Could you give a lecture of Example for calculation of seismic loads for a conventional valve., like Globe valve as it may be useful for valve enginers
Thank you, glad it helps. As far as valves are concerned, that's really outside of my expertise, sorry!
excellent! I really enjoyed it, very clear presentation.
@ 20.08 for wind loads, you had mentioned the wind loads be the same. But the wall length are different, can you comment on that?
@ 4.52, would the weight be the same if it were wind loads, 1/2 of 2-walls plus roof weight?
thanks
Thanks...glad it was helpful. The wind load *pressure* is assumed to be the same in all directions. The total wind *force*, however, depends on how long the wall is to accumulate that pressure. For the second question, the wall and roof dead loads are what generate the seismic forces in a building by virtue of their inertia. Wind loads in contrast act externally to the wall, so the wall weights are not part of load computation.
Really appreciated!
simple and clear, thanks
Excellent video thanks to upload.
Glad it helps! Thanks for your comment.
Good day maam if im going to calculate a seismic load on vertical storage tank? Still the same formula or what is the difference?
Sorry, that's a question outside the scope of things here. I make these specifically for my students in architecture but post them here for general info. The process here also is using older code provisions that have been superseded. The basic principles would be the same for a storage tank, though, that seismic forces come from inertial mass of whatever is being stored in the tank. I suggest you look at other more technically-based structures links. Dr. Structure here on TH-cam might be a good place to start.
Hi,
Thank you for posting this.
Could you please post a video of Seismic for a multi story building and one of wind loads.
Thank yiu
Excellent
yes!
Hi professor Deb. Do you have an example for designing cast-in-drilled-hole (CIDH) steel reinforced concrete piers? I have software to design the pier itself, but not sure how to establish horizontal seismic force for each pier (lateral loads near slopes already provide by my Geotech). I was proposing that I could take the tributary total dead load and simply multiply it by the calculated base shear factor of approximately .14W here in California zone 4. This is for my own residential foundation repair design. Thanks so much ! Ted
Hi Ted...sorry no, that's really outside the scope of the type of videos I make for my students. For a real project on your own house subject to the seismic loads you really need to consult with a licensed structural engineer. So much depends on the soil type of your foundations as well as the dead load of the house. 14% of your dead load may or may not be high enough for your location. The resonant interaction between the natural periods of vibration of the building and soil are a critical concern. Designing for seismic resistance is NOT a do-it-yourself job! This is not to even mention the necessary anchors and straps required throughout the house to maintain a continuous load path from the roof to the foundation.
At the end when you find reaction R, why you divide the value by 2? Is it because we have 2 walls on that row or something else?
Because it acts like a simple-span beam...half the load goes to each end reaction.
Thanks
I am new to the structural analysis. Roof DL (North-South) should be calculated 15 psf * 1 ft (12" strip a.k.a tributary width) which indicates the linear load along 60' long section?
I'm not quite sure if that's a question or a statement. If it's a question, maybe you could rephrase it as I'm not quite sure what is being asked. The loads computed in the N-S direction are those that accumulate (plus the wall DL) along the 100' width of the building, That force is then in turn resisted the the exterior N-S walls on the east and west faces that carries it to the foundation,
@@professordeb Why was the Roof DL(15 psf) multiplied by "60ft" for N-S?
nice
Professor how do i find the earthquake load that we put in to load the combination equation is that the base shear value or the resultant value of all floor or each story? which value do I use to check the earthquake load combination? Thanks.
In multistory structures the base shear is the total due to the inertial forces accumulating from top to bottom of the structure. This base shear then gets distributed to each level of the structure as a percentage of the total. Codes have a formula for that that also consider the mass of each floor level and period of vibration, all of which is beyond the scope of what I cover here in this basic example.
What is the program you are using for the demo?
The 3D graphics are Rhino, the 2D illustration was done with Illustrator.
Which code does this example follow?
This is based on an old code in the United States (the Uniform Building Code of 1998), which is quite simplified from current codes. The intent of this example is to explain the basic principle of how seismic loads are generated and move through a structure without getting overly complex.
@@professordeb Understood. Thank You.!
Beautiful calculator