×
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

Approach and Departure Angle Design for Fire Trucks

Approach and Departure Angle Design for Fire Trucks

Approach and Departure Angle Design for Fire Trucks

(OP)
The local fire department has established a standard that sets the maximum approach/departure angle at 10.5%. I understand this to mean that I can not have an instantanious grade change of more than 10.5%. Lets say I need to transition between 2% and 15% grade at a residential driveway. I will no doubt need a vertical curve of some length. It is the determination of that length that I am wanting help with. It would seem that the mimimum limit of the VC length would be equal to a distance greater than the wheelbase of the longest wheelbase fire engine that the department would expect to fight a residential structure fire with. If the wheelbase were to be assumed to be 30', then a fire truck "centered" on a vertical curve g1=2% g2=15% with a VC length of 30'would be at a grade of (15-2)/2 = 6.5%. If the max rate of grade change of a VC is at the Midpoint of the VC then that would be the "worst case". 15%-6.5% = 8.5% comfortably under the 10.5%.

Does any of this hold water? Sorry for being so long winded?

Thanks for your thoughts,
CFCivil

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