topic Re: Tan(Δ/2) in the Alignment Grid View details in Civil 3D Forum

Tan(Δ/2) in the Alignment Grid View details

gaurkarv9 — Mon, 29 Nov 2021 12:54:26 GMT

Dear community members,

I 've copied the details of horizontal alignment using the "Alignment Grid View" option. Thus I created my MS excel file of horizontal alignment attributes. The excel file is attached herewith. My question is, how can I find ready-made Tan(Δ/2) value. I have to find Ts for the horizontal alignment curve box.

Thanks in advance.

Re: Tan(Δ/2) in the Alignment Grid View details

KirkWM — Mon, 29 Nov 2021 18:42:18 GMT

If I understand the situation, T (stated as RTan(Δ/2)) should be the same as the "External Tangent" column in the alignment data panorama.

Re: Tan(Δ/2) in the Alignment Grid View details

KirkWM — Mon, 29 Nov 2021 18:45:50 GMT

OH wait, are you talking about spirals?

Re: Tan(Δ/2) in the Alignment Grid View details

gaurkarv9 — Tue, 30 Nov 2021 04:50:59 GMT

Yes...Its about spirals

Ts=((Radius+Shift)*Tan(Δ/2))+k...

Any solution to find Tan(Δ/2) quickly from that excel file ?

Re: Tan(Δ/2) in the Alignment Grid View details

wfberry — Tue, 30 Nov 2021 19:03:49 GMT

Why not explain what you are wanting to do. Are you trying to draw this layout or what?

Bill

Re: Tan(Δ/2) in the Alignment Grid View details

gaurkarv9 — Wed, 01 Dec 2021 05:17:23 GMT

I have drawn the alignment. I want to create the horizontal curve boxes (which I have to give to draftsman). The details like super elevation, speed, radius, shift, deviation angle etc. have been done. The remaining thing is Tan(Δ/2). If I go to find it out manually, its going to consume much time. So I am asking (with the help of excel file), how to find this Tan(Δ/2) with minimum time and effort ?

Re: Tan(Δ/2) in the Alignment Grid View details

wfberry — Wed, 01 Dec 2021 14:09:52 GMT

If you have drawn everything, the easiest way to find "delta" is to label the deflection angel at the main P.I.

Bill