×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Simple horizontal curve

Simple horizontal curve

Simple horizontal curve

(OP)
Here is a question about simple horizontal curves:
To calculate PC Sta, subtract T from PI Sta,  then  add L to PC Sta to get PT Sta.  My question is, isn't stationing based on the roadway, that is, on the curve?  If this is true, how can you subtract T from PI Sta to get PC Sta?  The reason I am saying this is because the length of T and length of one half arc are not the same, therefore I am thinking one has to subtract 1/2L from PI Station.
This is assuming that PI is halfway between PC and PT, which should be correct since T's on both sides are equal to each other and the line from center of arc to PI divides the center angle by two.

RE: Simple horizontal curve

The PI Sta. shown on the table of curve data is the PC Sta. plus the tangent length by definition.   This has nothing to do with the physical location of the PI  relative to the alignment.  This is a carryover from the older methods of staking where the PI would be located by chaining (taping) along the alignment.  Continuing the stationing would lessen the possibility of error.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources