ARE 5.0 PDD/PPD Formulas and Concepts
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- Опубліковано 21 жов 2024
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In this video I am sharing 4 concepts that you will likely be tested on in the PPD and PDD exams.
I'm going to cover bending formulas, moments, vapor barriers and solar orientation. I'm also going to share the only four structural equations I had memorized for the exams.
at 0:55 - bending, moments and section modulus
at 6:40 - vapor barriers
at 9:00 - solar orientation for passive heating
at 10:45 - deflection, modulus of elasticity and moment of inertia
Free ARE and Revit resources
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ARE 5.0 PDD/PPD Playlist: goo.gl/bBhSoF
Books:
Architectural Graphic Standards: amzn.to/2K258QD
Architect's Studio Companion: amzn.to/2F1M6pF
Links from this Video
2012 IBC: codes.iccsafe....
2012 IECC: codes.iccsafe....
Passive Solar Strategies: www.nrel.gov/d...
Section Modulus: en.wikipedia.o...
Thank you so much for the tips. this is incredibly helpful. Any chance you can do electrical and mechanical?
You're welcome! I'm not sure if I am the best to do electrical, maybe mechanical though. Email me through my website if you have any questions and maybe I can help.
I know this old but I want to point out that the vapor barrier should go on the "warm in winter" side of your wall. Basically if you're usually heating the building during winter (like most places in the US) then you'll want the VR/VB on the inside of the studs. Unless the exam specifically says "hot climate" I would assume that to be the case.
Thank you. What a flashback to structures. Easy to understand.
Awesome! Presented in a straightforward + straight-to-the-point manner.
I just bought your PPD/PDD study materials. I like your straightforward approach. One comment on a statement you make in this video, namely that vertical fins are superior to horizontal overhang or fins on the east/west façade. I have seen this claim in other sources, like (I think Ballast) but there are different opinions on this to say the least. Check out Lechner's Heating, Cooling, and Light chapter on shading, for example. He is unequivocal that horizontal shading is better on these facades, with a preference for horizontal louvers to allow heat to rise through and not be trapped. I think his main reasoning is that vertical block too much of the view, but I think even if we went with vertical fins here, there would have to be more of them and not angled 90deg to the wall. The vertical fins you have drawn would not be of much use in the summer when in many latitudes the hot lower eastern/western sun would by pass them. Do you have a counter-argument here? Anyway, generalizations are always difficult, so there may be no "right" answer at this level of analysis.
Hi Clark, thanks for signing up!
Lechner is great, and HCL is one of my favorite PPD books, highly recommended. I don't think he is unequivocal that horizontal shading is better East and West. He is just clear that vertical fins can limit views...this is true.
The issue with East/West sun is that is tends to be lower and extra glare-ey. A horizontal overhang would have to be really long to be effective, Lechner says this as well. I missed the part about heat rising, but that's not really what shading devices are for...they are trying to limit direct solar radiation through windows, and maybe working to limit glare on the East and West.
The real answer is that it is dependent on the site, the program, the wishes of the client, etc. But on the ARE, where you have 2 minutes to solve every problem and we have to speak in general terms, I think vertical shading devices are correct on the East and West. And angled to the north is better. If it comes up, just see what the question is asking you to do.
And...you can always play around with this in Revit or Sketchup. Build some simple walls to act as fins and turn the sun path on.
@@HyperfineArchitecture Hey Ben. First, I LOVE these tip videos. Thanks for making them. As for the overhang question, Lechner summarizes chapters with key ideas. In chapter 9, key idea #9 is "On the east and west facades, the horizontal overhang is preferred over vertical fins". I think that's pretty unequivocal. He also discusses it in the text. He doesn't like vertical fins much. But he's just one voice.
BTW, what I am claiming is that the vertical fins in your example will not block much solar radiation in the summer early morning and especially in the afternoon when it is really hot. I did a quick SketchUp study to prove the point to my satisfaction. As for the heat dissipation comment, in this context the microclimate around the window IS important because the reason for the overhang is to reduce heat gain, so the heat dissipation of a horizontal fin over solid overhang would be important...if you chose that design direction. Anyway, I do agree with you that this is all about the specific site and other variables. For example, in many situations a large horizontal overhang is a real advantage. It's called a porch.
BUT as you say, this is about the ARE, not geeking out on the details. I actually feel for the folks writing these exams. To cover these topics, you have no choice but to generalize, but that often just doesn't work well. That makes your advice to generally look to the architectural context very useful. Thanks for that! Ok, back to studying :)
You are better than 3rd party study material! Thank you.
Ha, you're welcome! I'm not getting into the test prep business anytime soon :-)
HI- thanks for your videos! I noticed at 2:37 you referred to an equation of wL^2/8 as a moment for cantilevered beam. However I think that is actually a fixed on one end, other end is supported equation.
You are very welcome, and you're right, thanks! I said the wrong thing, but the correct beam condition is what's shown on the image, same as what you just mentioned.
Thaank you sir
Thank you for this vid, clear lucid and precise! Washington, DC!
You are very welcome!
Determine appropriate documentation of building design (A/E)
Architects must identify a drawing and documentation approach based on project complexity, materials and assemblies,
delivery method, and other project or construction related requirements. Throughout project documentation, you must
know how to refine, update, and make adjustments to the drawings to align with new or changing project requirements.
Documentation must also indicate final selections of building materials, assemblies, and finishes.
Totally.
I'm pretty sure I had a questions specifically on the stress strain curve. Asking me to define whichever point they called out... just a heads up
Thank you for making this video! Very helpful!
Thanks, good stuff ! for those who think he is fast, I changed my setting to a .75 speed and its perfect for me.
I am having hard time to understand something. In the first example, 30 lbs/ft2 is given and while calculating W you multiply 30 lbs with only 10ft. If it is 30 lbs per square foot shouldn't we need to calculate the weight per whole surface and calculate it as 30x10x10? Or it is only a simple mistake, 30 lbs is per linear foot not square foot? Thanks!
I did the 30*10 to account for the weight of 1 linear foot. I think that's what you need to do to account for the different spacing. Then the L^2 will end up giving you the total weight as part of the equation. We are looking at this in plan, so we see the weight of the system as 30lb/sf but we can also see the joist spacing. If we were looking at this one beam in a free body diagram we wouldn't know about the spacing, but we would probably be given the weight as 300lbs/ft.
At 4:40, M shall be 3,750 in lieu of 3,500 ft-ib.
You are right! Thanks for the correction.
Well done! What program do you use to record your screen?
Thanks, Darguin! For screen recording I use Debut Pro: goo.gl/EW8dm6
My webcam is a Logitech C615: amzn.to/2JYgYuk.
theres a terrible audio buzz in the background
@4.40 10 ft supported mid-span my calculation came to M=3,750 and not M=3,500 why? what am I doing wrong?
You are right, I messed that one up. See some earlier comments as well.
in cold climate, does the vapor barrier go on the interior side of the building? For, example from Inside to out, 1 layer of gyp, vapor barrier, wood stud with insulation, exterior sheathing, and exterior cladding?
Yes, the wall assembly you describe would work for a cold climate, at least as far as the ARE is concerned!
@@HyperfineArchitecture Thank you!
@@HyperfineArchitecture where is the "vapor" then? Is there a ventilation system? Humidification?
@@piezoification you can assume the vapor will be wherever the warm air is. In the summer, an air conditioning system can provide dehumidification, obviously this will not be on in the winter in cold climates though.
Love this video. Just wanted to note that there is a discrepancy between your statement regarding shading devices on the E/W facades. Heating, Cooling, Lighting, Section 9.3 states "Although
less effective, the horizontal overhang is also the best on the east, southeast, southwest, and west orientations." This is also what Elif references in her practice questions. Do you have any further insight on this?
Thanks! I don’t agree with HCL. The sun is too low in the west and east. For best shading you will need to incorporate vertical fins.
Why do we need to memorize structures formulas? The free body diagrams are given as structural references in the exam along with deflection properties!
You can choose for yourself what you want to memorize, but the formulas I discuss here are concepts you need to know. Even if you don't memorize them you need to understand enough to know what you're supposed to go look up. Also, the exam references load slowly, and there are dozens of pages of references provided. Memorizing a few key formulas will save you a lot of time on the exam, and time is at a premium. If you are unsure of where to look for these formulas on the exam, check out this video: ua-cam.com/video/WkjyZsutnC0/v-deo.html
True about the exam loading part. It feels like I'm browsing on a 90s computer.
thanks for your youtube and PDF study guide resources tho- best one I've seen!
Thanks and you are very welcome! I agree, the exam is given on computer setups that are far below the standards most of us are used to working with every day.
Nicely Done!
Hi
Why are you talking so fast? Slow down so people can follow you.
I was probably just really excited to talk about formulas. I'll do better next time, thanks!
@@HyperfineArchitecture Also, I disagree and think it's a good speed. But each person to their own :)
@@erinp8635 Thanks! Someone on a different video suggested watching on .75 speed.
@@HyperfineArchitecture i watch you on 2.0 speed