×
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

transverse intermediate stiffener and shear resistance
5

transverse intermediate stiffener and shear resistance

transverse intermediate stiffener and shear resistance

(OP)
Does the transverse intermediate stiffener shown in this pic increase the shear resistance? If so, how? This seems counter-intuitive to me (blame my mechanical background if you wish).

RE: transverse intermediate stiffener and shear resistance

3
There are a couple of options at least, and they are related:

1) One of the shear failure modes is shear buckling of the beam web. The stiffeners can be made to effectively brace the web against that kind of buckling.

2) With properly proportioned and spaced stiffeners, one can utilize tension field theory for the beam shear design. Basically, you treat the beam as a truss with the stiffeners being the compression struts and diagonal strips of beam web being the tension webs. Most steel codes have a section describing this shear model. Certainly AISC and CISC do.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: transverse intermediate stiffener and shear resistance

(OP)
KootK, thanks for the clear and prompt response. The shear buckling makes sense to me. The field theory is over my head.

RE: transverse intermediate stiffener and shear resistance

Don't feel bad... Koot flies over many people's heads.. Him and a few others on this board are on different levels from the rest of us Laymen.

RE: transverse intermediate stiffener and shear resistance

There are several theories.

Basler's theory from the early 1960s is the basis of the AISC and AASHTO strength equations. Like KootK typed, after buckling, the web is idealized as a truss, and the stiffeners are in compression. This is explained in Salmon and Johnson.

Hoglund's Swedish research is from the early 1970s, and is the basis of some European code strength equations. By his theory, stiffeners increase the plate buckling coefficient, so increase the web buckling strength. They also allow frame action in the flanges.

Lee, Yoo, and colleagues have shown that the transverse stiffeners do not resist much axial load, so Basler's model is a bit inaccurate in assuming truss behavior. The stiffeners mostly hold the web in line while web stresses redistribute, including increased web compression stresses near the stiffeners. They provide strength equations in their 1998 paper and talk about behavior in their 2006 paper, among others.

RE: transverse intermediate stiffener and shear resistance

@Jayrod: welcome to the KootK Christmas card recipient list.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: transverse intermediate stiffener and shear resistance

Welcome back, 271828. Haven't seen you around lately.

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