I know this is an old comment. I am responding in case it helps others who are learning this now. The correct answer is 608.00 - (1)(5) = 603+00. This is because we know the exit grade is going down 2%, or -2%. The sign can be ignored as the equation is already taking into account the '-'. Here's a logic check to show you it's correct. If we were to use both negatives, making a positive sign in the equation, the answer would be 613+00 ft. This is saying that the EVC (or PVT) of the vertical curve is higher than PVI, which doesn't make sense.
I am wondering the same thing. In a previous video, he didn't assume the point fell exactly in the middle. On this example, we don't have enough information to use that strategy, so it essentially forces us to solve it assuming that PVI is in the middle.
The example given isnt really correct per real world application. Station 20+00 is 2,000 ft. You simply drop the plus sign, the plus sign is used in the construction industry to help annotate stationing for horizontal location......So, 2000 ft. minus 3000 ft is 1,000ft. That is the length of the vertical curve.
It is a dimension less number and slope value which say eg. for every 100ft in horizontal direction 1ft rise in vertical direction which can be represented as 1ft/100ft = 0.01 = 1% feet cancels out
Thanks2x I thought I would end up for nothing. my prof give us an assignment with lots of missing Given value and we need to find the elevation of BVC and EVC. just the given are g1 & g2, station and elevation of PVI, and "k" factors. thanks for this vids. It really helps, now I better understand how do I get the elevation of BVC and EVC. It comes with the same answer with what my prof teach..it is very cool since its much easier bcoz of the drawing than what my prof teach us and end up imagining for nothing >_
There is hidden information here. He is multiplying by a percentage which doesn't make sense mathematically. What is going on or what I think is going on is that values he is using for horizontal distance is a hundred times the size. For example 5 is actually 5x10^2 . So if you convert the 2% into decimal .02 you can then (.02)(5x10^2) = 10 which is the same thing as (2%)(5) = 10.
Why did you say "608.00'-2(5)=608-10=598.00"??? It should't be like that! because g1 is going upward. Therefore you should put a + sign like so: [608.00'+2(5)=608-10=618.00] Thank you!
that would be incorrect seeing as 608 feet high was stated to be the highest point (Maximum) on the curve it's just the notation don't let it confuse you
all your videos are so helpful and really awesome .. thank u for your effort
I just want to thank you for the way you explain the type, God bless you so much. What a help you been to me.
Great video.... Really helps, keep up the good work
3:09 2 negative signs will give u a positive sign
608.00 - (-1)(5) =?
I know this is an old comment. I am responding in case it helps others who are learning this now.
The correct answer is 608.00 - (1)(5) = 603+00. This is because we know the exit grade is going down 2%, or -2%. The sign can be ignored as the equation is already taking into account the '-'.
Here's a logic check to show you it's correct. If we were to use both negatives, making a positive sign in the equation, the answer would be 613+00 ft. This is saying that the EVC (or PVT) of the vertical curve is higher than PVI, which doesn't make sense.
how can u assume the STA at the high-point being centered when the grades are different ?
g2-g1/2L
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I am wondering the same thing. In a previous video, he didn't assume the point fell exactly in the middle. On this example, we don't have enough information to use that strategy, so it essentially forces us to solve it assuming that PVI is in the middle.
Can you do an example on vertical sag curves please?
Flip your signs.
I clear you
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A very helpful video thankyou.
THANK YOU, KIND SIR! UR AN ANGEL!!!
How to calculate in form of cordinate?
Good question
Very simple question
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Beautiful explanation!!
So the PVI is exactly in the middle, but the max of the curve doesn't necessarily have to be too, correct?
Right going my channel
Top stuff Simmy
I am dumb! Is there an app for this?
Great video.
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I thought you add to find EVC
Why STA 10? Please answer my question
The example given isnt really correct per real world application. Station 20+00 is 2,000 ft. You simply drop the plus sign, the plus sign is used in the construction industry to help annotate stationing for horizontal location......So, 2000 ft. minus 3000 ft is 1,000ft. That is the length of the vertical curve.
What is the G1 and G2 in feet ? Thanks-
Grade 1 and grad 2 good question
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It is a dimension less number and slope value which say eg. for every 100ft in horizontal direction 1ft rise in vertical direction which can be represented as 1ft/100ft = 0.01 = 1% feet cancels out
is these equations match with metric system?
it is good???????????????
More information need
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What about Parabolic Sag Curves? Can you solve a problem like this? Thanks dude. 😊
Parabolic curve
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Slove your question
Thanks2x I thought I would end up for nothing. my prof give us an assignment with lots of missing Given value and we need to find the elevation of BVC and EVC.
just the given are g1 & g2, station and elevation of PVI, and "k" factors.
thanks for this vids. It really helps, now I better understand how do I get the elevation of BVC and EVC. It comes with the same answer with what my prof teach..it is very cool since its much easier bcoz of the drawing than what my prof teach us and end up imagining for nothing >_
Isn't a = (g2 - g2) / L NOT a = (g2 - g1) / 2L?
Nevermind, Dr. Shahin Mansour uses a slightly different approach, but you both arrive to the same answer.
a = (g2 - g1)/2L
that's how i know it
a=g2-g1/2L going my channel I clear to
There is hidden information here. He is multiplying by a percentage which doesn't make sense mathematically. What is going on or what I think is going on is that values he is using for horizontal distance is a hundred times the size. For example 5 is actually 5x10^2 . So if you convert the 2% into decimal .02 you can then (.02)(5x10^2) = 10 which is the same thing as (2%)(5) = 10.
Never mind he clears it later in the video.
Right
2% =0.02=tanβ=opposite/adj = elev/dist
No problem vertical cruve very semple going my channel
Nice
Good
the calculation is confusing. you d better constant use either % or 0.00 through your work.
Why did you say "608.00'-2(5)=608-10=598.00"??? It should't be like that! because g1 is going upward. Therefore you should put a + sign like so: [608.00'+2(5)=608-10=618.00]
Thank you!
that would be incorrect seeing as 608 feet high was stated to be the highest point (Maximum) on the curve it's just the notation don't let it confuse you
I am confused too! Did you find out the correct answer?
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Very simple method going my channel
Is 2% , 0.02
Boring
No I am clear to going my channel