×
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

Academic Example of Direct Analysis Method?

Academic Example of Direct Analysis Method?

Academic Example of Direct Analysis Method?

(OP)
Are there any online academic (single frame) examples using the direct analysis method? Unfortunately I went to school before it existed and I haven't been able to find any good hand (non-computer) examples that I can work through and check my understanding.

RE: Academic Example of Direct Analysis Method?

Take a look at chapter C of the AISC design examples V14.1 Link
Also steel design guide 28 Link
DAM works great with cp´s, doing it by hand reduces most of the benefits it has as you will have to use approximate second-order analysis of appendix 8.

RE: Academic Example of Direct Analysis Method?

Josh Plum of RISA has a good paper on their web site.

RE: Academic Example of Direct Analysis Method?

(OP)
LQQD: Thank you, this AISC example is helpful.

oldrunner: Thank you, I didn't find his paper on the RISA website, I'll have to keep looking.

Due to the time length, I am wondering if the DAM will need to be utilized on the SE exam?

RE: Academic Example of Direct Analysis Method?

(OP)
It seems one of the main benefits of the direct analysis method is to eliminate ambiguities from the calculation of the effective length factor, K. However, doesn't K still has to be calculated to determine the nominal compressive strength of the column?

RE: Academic Example of Direct Analysis Method?

Example C.1A of the Design Examples V14.1 uses K = 1 at the final column check.

Quote (AISC 360-10 pg 16.1-25)

C3. CALCULATION OF AVAILABLE STRENGTHS
For the direct analysis method of design, the available strengths of members and connections shall be calculated in accordance with the provisions of Chapters D, E,
F, G, H, I, J and K, as applicable, with no further consideration of overall structure stability. The effective length factor, K, of all members shall be taken as unity unless a smaller value can be justified by rational analysis.

"It is imperative Cunth doesn't get his hands on those codes."

RE: Academic Example of Direct Analysis Method?

(OP)
MacGrubber22: Thank you very much, I was looking directly at the ΘPn charts for the KL/r values. If this analysis was being performed on an actual structure I assume more than just the gravity load case would need to be considered.

RE: Academic Example of Direct Analysis Method?

The RISA white paper on the Direct Analysis Method is on the Downloads - Technical Papers page of our website.

http://www.risa.com/d_techpapers.html

These aren't really worked examples. More like a white paper, a power-point presentation and a couple of "benchmark" problems. Specifically, those benchmark problems assess the validity of RISA's 2nd order analysis capabilities, they don't represent worked examples.

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