×
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

ASCE 113 base plate design substations

ASCE 113 base plate design substations

ASCE 113 base plate design substations

(OP)
I have a question regarding the formulas given in ASCE 113 regarding determining the thickness required for a base plate. Here is the link to ASCE 113 showing the the base plate formula: http://files.engineering.com/getfile.aspx?folder=3... . I am working on a spread sheet to design base plates. I am trying to verify that I have calculated the C value correctly. I am confident with the BL value. Here is a sketch of the base plate http://files.engineering.com/getfile.aspx?folder=5... . A weep hole will be added to the base plate but it is not shown. Any comments/ suggestions are appreciated.

RE: ASCE 113 base plate design substations

What C value are you talking about the formula, as I read it is:

Bolt Load = (P / total area + Mx*y/Ix + My*x/Iy)*Bolt Area

I don't see a C in that formula... The distance from the reference axis would be the distance from the centroid of the section.

RE: ASCE 113 base plate design substations

(OP)
See Eq. 6-5 on page 104 of the attachment (also see page 103).

RE: ASCE 113 base plate design substations

C is the distance from the bolt to the assumed yield line. They give several options for yield lines in the document, but yours is going to be at the face of the column.

RE: ASCE 113 base plate design substations

(OP)
My issue is since it is an assumed line, what is the proper method to determine the distance? If the bend line is tangent to the column then the c value can be determined by subtracting the width of the HSS column from the d1 or d2 distance then using those values to determine the length. But if the assumed line is closer to the bolt hole then the c value is much shorter.

RE: ASCE 113 base plate design substations

As the engineer, you need to determine what location of the bend line will govern your design.

By inspection, a longer bolt moment arm C will generate a larger plate stress, so you're looking for the longest bolt arm for that given orientation of bend arm. Of course, the plate can't bend through the HSS section, so as mike says, the worst case bend line location is at the face of the column.

(For a square column and 4 bolt base plate as shown, you'll need to check bend lines in one or both orthogonal directions, plus a diagonal bend line across the corner)

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