How to adjust origin of vertical curve into specific elevation while keeping radius not changing

RE: How to adjust origin of vertical curve into specific elevation while keeping radius not changing

Tuan — Fri, 24 Jun 2022 10:09:20 GMT

Thank you a lot, Jan.

RE: How to adjust origin of vertical curve into specific elevation while keeping radius not changing

Tuan — Fri, 24 Jun 2022 10:09:04 GMT

Thank you so much, Paul.

RE: How to adjust origin of vertical curve into specific elevation while keeping radius not changing

Tuan — Fri, 24 Jun 2022 10:08:12 GMT

Thank you, MaryB.

RE: How to adjust origin of vertical curve into specific elevation while keeping radius not changing

Jan Blaasse — Fri, 24 Jun 2022 08:57:33 GMT

If the curve can be designed as a single element before you add the preceding and following elements, you could use Profile Curve Between Points, using option HighLow\End. This will allow you to place a curve at a point using a given radius.

RE: How to adjust origin of vertical curve into specific elevation while keeping radius not changing

Paul Cusack — Fri, 24 Jun 2022 02:35:08 GMT

If the entrance and exit grades are fixed and you have a circular vertical curve with a fixed radius then there is only one mathematical solution to create the curve tangential to the entrance and exit grades so the curve could not be adjusted without changing either the radius or the grades

RE: How to adjust origin of vertical curve into specific elevation while keeping radius not changing

MaryB — Thu, 23 Jun 2022 18:57:09 GMT

It may not be possible. While I don't know about this specific maneuver, ORD is very bad about not allowing us to lock any values. You may need to adjust the VPC first, then redefine your radius. This also may depend on whether your VPT has some kind of constraint on it (because that will need to change when you do what you ask).