thanks a lot sir, learned a lot from this video alone than in my 3hrs Sat class
@iLLMaSTa35
2 жыл бұрын
Very Clear & Concise! Thank you.
@FindleyDaniel
2 жыл бұрын
Thanks for the kind feedback. If it's helpful, I have organized similar videos in playlists on this page: sites.google.com/ncsu.edu/daniel-findley/educational-resources
@kavinmalarkannan4755
2 жыл бұрын
hands down the best video
@FindleyDaniel
2 жыл бұрын
That's very kind, thank you!
@creativitychannel3180
Жыл бұрын
@@FindleyDaniel sir Thanks
@chekaniavincent427
5 жыл бұрын
Thank You Sir. Clear explanation
@sarahli2521
4 жыл бұрын
Brilliant video. It helps a lot indeed. Thanks.
@mira-zy9jp
Жыл бұрын
Thanks for your help
@mulugetaalemu2122
2 жыл бұрын
I develop my knowledge of vertical curve elements
@BigMeddy
2 жыл бұрын
Great breakdown
@Podraw
3 жыл бұрын
Very helpful thank you
@patrickwise3127
3 жыл бұрын
Excellent! Good stuff! More examples more examples, I say! WHOO!
@FindleyDaniel
3 жыл бұрын
Thanks for the comment - I recently organized my highway design related videos into better playlists on youtube. I've also summarized them here - sites.google.com/ncsu.edu/daniel-findley/educational-resources
@zEre326
Жыл бұрын
New subscriber right here! thank you
@FindleyDaniel
Жыл бұрын
Thanks! Glad you liked the video - I have organized the engineering-related videos into playlists on this page, if it's helpful for you: sites.google.com/ncsu.edu/daniel-findley/educational-resources
@vincentkosgei7166
2 ай бұрын
Subscribed and downloaded
@FindleyDaniel
2 ай бұрын
Thanks!
@RedwanMhammud
Жыл бұрын
Very good
@alialatar15
6 жыл бұрын
thank u thats help me a lot
@vaibhavpatil6488
3 жыл бұрын
Why do we take e=y... we are taking y as elevation whereas e is clearly difference of elevation between elevation of PVI and Point on curve right below PVI. Wouldn't that be.. e= PVI-y= (G1*L/2) - AL/8
@FindleyDaniel
3 жыл бұрын
This referring to the lowercase "y" which is the tangent offset that is described at 3:21 (kzitem.info/news/bejne/0pCMwK2cmGujZaA).
@mira-zy9jp
Жыл бұрын
اللهم صل على محمد وعلى اله وصحبه اجمعين
@eminashindahouse
3 жыл бұрын
Does the PVI always at the center of the vertical curve length? I am confuse..for instant, i will exaggerate the grade value to explain this. Let say the entry grade is 5% while the exit grade is 30%..isnt that obvious that the PVI will be at the right hand side of the middle vertical curve distance?
@FindleyDaniel
3 жыл бұрын
Yes, that's correct - for a symmetric, parabolic curve, the PVI will always be at the center. This is the most common and default type of vertical curve, so you should be safe with this assumption unless otherwise stated.
@eminashindahouse
3 жыл бұрын
@@FindleyDaniel well explained. Thank you Prof Findley 👍🏻👌🏻
@user-pw5xl7sh6t
5 жыл бұрын
Thank You Sir
@mulugetaalemu2122
2 жыл бұрын
Please give me a video of the following example sir
@FindleyDaniel
2 жыл бұрын
Absolutely, here is a playlist of vertical alignment which has a variety of example problems: kzitem.info/door/PLQ2tBMRKXROZsDv_W9Ax-ytgp5x3y2BQX
@harpergrace2510
3 жыл бұрын
Why your formula a=(g2-g1)/2L vs CERM r=(g2-g1)/L. Anyone can explain the reason is greatly appreciated. I’m confused why the divisor in your formula is 2L instead of just L🤷🏻♀️ But then CERM eq. 79.47 use your “a” formula with “2” when it’s substituted in the parabola general formula rx^2/2___my assumption is “a” formula to calculate the initial elevation or PVC and “r” is the formula use to determine the succeeding elevations per rate of change in slope 🧐
@FindleyDaniel
3 жыл бұрын
Unfortunately, I don't have my copy of the CERM at home, so I can't see exactly what you're referring to. You can try this method and the CERM method and see if you get the same results - that may help you determine what the difference is.
@zangetsu1597
5 жыл бұрын
I solved a problem where the PVC elevation was greater than the PVI elevation. Looking at the vertical curve, it looks like the PVI should always have the highest elevation. How come this isn't the case?
@FindleyDaniel
5 жыл бұрын
Great question! There are 6 possible scenarios when analyzing a vertical curve. These 6 scenarios fall into either sag or crest curves. Sag curves (with a concave up shape) g1 = negative and g2 = positive OR g1 = postive and g2 = steeper positive than g1 OR g1 = negative and g2 = flatter negative than g1 Crest curves (with a concave down shape) g1 = positive and g2 = negative [this is the scenario in this video] OR g1 = positive and g2 = flatter positive than g1 OR g1 = negative and g2 = steeper negative than g1
@FindleyDaniel
5 жыл бұрын
Of those six scenarios, two could lead to a situation with the PVC elevation greater than the PVI elevation: Sag with g1 = negative and g2 = flatter negative than g1 Crest with g1 = negative and g2 = steeper negative than g1
@Verdolaga52
5 жыл бұрын
Hello and thanks , Do you have an example for positive g1 and g2 or negative g1 and g2 whit lower and higher point in the curve
@FindleyDaniel
5 жыл бұрын
Below is a list of vertical curve videos that I've made, I can't recall exactly what scenarios I created for each though. Vertical Curve Fundamentals - kzitem.info/news/bejne/0pCMwK2cmGujZaA Parabolic Equation - kzitem.info/news/bejne/sICPqpyanIhnfoI Vertical Curve - kzitem.info/news/bejne/lZ2L3qNno5qmZ6g Vertical Curve Example - kzitem.info/news/bejne/mW5qyZVtk3aHrII Passing a Vertical Curve Through a Fixed Point - kzitem.info/news/bejne/z6RsxYaioqGjdKw Passing a Vertical Curve Through a Fixed Point Example - kzitem.info/news/bejne/onqKyKGihqFjiII High /Low Point - kzitem.info/news/bejne/kqZ9s2aqo3eTp2k High /Low Point - kzitem.info/news/bejne/yWZj4Jx4goqSioI
@FindleyDaniel
5 жыл бұрын
The key for this type of problem is to make sure you have the right sign (+ or -) associated with each grade. If you do that, everything should work out!
@junriesatamosa3265
4 жыл бұрын
Can show example,Simplify the example💜
@FindleyDaniel
4 жыл бұрын
This is probably a useful one for you: Vertical Curve Example - kzitem.info/news/bejne/mW5qyZVtk3aHrII Here is my full list of vertical alignment videos: Vertical Curve Fundamentals - kzitem.info/news/bejne/0pCMwK2cmGujZaA Parabolic Equation - kzitem.info/news/bejne/sICPqpyanIhnfoI Vertical Curve - kzitem.info/news/bejne/lZ2L3qNno5qmZ6g Vertical Curve Example - kzitem.info/news/bejne/mW5qyZVtk3aHrII Vertical Alignment Example - kzitem.info/news/bejne/pGye0YadjWp6rWU Vertical Alignment Example - kzitem.info/news/bejne/lnmCm6CpgaaGg4Y Vertical Alignment Information from Google Earth - kzitem.info/news/bejne/2Xev1neufqyoaaA Extracting Vertical Information from Google Earth - kzitem.info/news/bejne/qXufyJpnm5t6dpw Parabolic Equation from Google Earth Information - kzitem.info/news/bejne/moisz5WksYxlp4I L=KA - kzitem.info/news/bejne/tquFtm2kcpWIoZg Passing a Vertical Curve Through a Fixed Point - kzitem.info/news/bejne/z6RsxYaioqGjdKw Passing a Vertical Curve Through a Fixed Point Example - kzitem.info/news/bejne/onqKyKGihqFjiII High /Low Point - kzitem.info/news/bejne/kqZ9s2aqo3eTp2k High /Low Point - kzitem.info/news/bejne/yWZj4Jx4goqSioI
@Call.of.the.mountains
Жыл бұрын
Why do we delve deep into the science and mathematics of different curve types like circular and parabolic for highway design when, in practice, modern software tools render them perfectly identical for vertical crest curves? Isn't the distinction becoming more theoretical than practical, given that most software defaults to a circular representation?
@FindleyDaniel
Жыл бұрын
I'm not familiar with agencies switching to circular arcs instead of parabolic curves for vertical alignment. Parabolic curves fit the terrain better and provide a smoother transition for vehicles (relative to a circular arc). For horizontal curves though, yes, circular arcs are the most common. I have a few videos showing horizontal and vertical curve designs. Here's an example of a vertical curve, using parabolic equations: kzitem.info/news/bejne/256Dk3eBpJOfaII
@Call.of.the.mountains
Жыл бұрын
@@FindleyDaniel thanks for reply - I would agree with you but if you draw curves (circular or parabolic) in C3D or ORD Bentley - they look identical no matter how much you change gradients or exaggeration - I asked Bentley and they told me - It's mostly true that there are no visual differences. One of the differences isn't in what you can see, but in how they behave in combination with other elements - so no point to teach parabola - software doesn't reproduce it sadly
@FindleyDaniel
Жыл бұрын
@@Call.of.the.mountains Interesting, do they show up correctly on design plans (I would assume that one some vertical curves there is a substantial difference based on the elevation increments).
@Call.of.the.mountains
Жыл бұрын
@@FindleyDaniel it used to be like this in MX but now bentley made it too simple sadly. If you can send me an image to show comparison between the two - maybe I can tell them that software is producing design in error
@FindleyDaniel
Жыл бұрын
@@Call.of.the.mountains This video shows one, is that clear enough: kzitem.info/news/bejne/256Dk3eBpJOfaII
@hadeelnasraldeen7468
3 жыл бұрын
What is the usage of crest and sag ?
@FindleyDaniel
3 жыл бұрын
This video helps explain how and when you need to know when a curve is a crest or sag: kzitem.info/news/bejne/tquFtm2kcpWIoZg And, here are some additional vertical alignment topics that might be useful for you: Vertical Curve Fundamentals - kzitem.info/news/bejne/0pCMwK2cmGujZaA Parabolic Equation - kzitem.info/news/bejne/sICPqpyanIhnfoI Vertical Curve - kzitem.info/news/bejne/lZ2L3qNno5qmZ6g Vertical Curve Example - kzitem.info/news/bejne/mW5qyZVtk3aHrII Vertical Alignment Example - kzitem.info/news/bejne/pGye0YadjWp6rWU Vertical Alignment Example - kzitem.info/news/bejne/lnmCm6CpgaaGg4Y Vertical Alignment Information from Google Earth - kzitem.info/news/bejne/2Xev1neufqyoaaA Extracting Vertical Information from Google Earth - kzitem.info/news/bejne/qXufyJpnm5t6dpw Parabolic Equation from Google Earth Information - kzitem.info/news/bejne/moisz5WksYxlp4I L=KA - kzitem.info/news/bejne/tquFtm2kcpWIoZg Passing a Vertical Curve Through a Fixed Point - kzitem.info/news/bejne/z6RsxYaioqGjdKw Passing a Vertical Curve Through a Fixed Point Example - kzitem.info/news/bejne/onqKyKGihqFjiII High /Low Point - kzitem.info/news/bejne/kqZ9s2aqo3eTp2k High /Low Point - kzitem.info/news/bejne/yWZj4Jx4goqSioI
@000DiegoLabarca000
4 жыл бұрын
This can't be correct when you talk about the grades. I've seen a million problems where the grades are put in their decimal form. But I do have one question about grades: I've also seen that sometimes they use their absolute value and sometimes they don't. How do you know when to use the absolute value and when not to?
@FindleyDaniel
4 жыл бұрын
That's correct - it's not impossible to use other units. However, with the equations presented and for the sake of consistency, you should pick a method and stick with it. From a units perspective, having grades in percent and distances in stations works out (each is in 100s), which is why I present the equations that way and recommend that method. In general, the sign (+ or -) of the grade is critical and should be associated with the grade. However, there are cases when the sign isn't necessary, including when calculating the external distance (distance from the PVI to the curve) and when using the formula L=KA (where A is the algebraic difference in grades - though this application still accounts for the grades because the K value is specific to the vertical curve type).
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