Msc Kl/R

Home Back Issue Archives Reader Resources Subscriptions Advertising Reader Feedback About MSC
Search MSC ...

Steel Interchange
Gusset Plate Buckling
My question is regarding compression buckling of gusset plate attached to a beam and column. For example, if my brace is in compression, how do I check the KL/r for the effective section of the gusset plate? Question sent to AISC 's Steel Solutions Center

My Profile
Register Login

Reader Resources
Steel in the News Industry happenings, auctions, firms for sale, and notable events. SteelWise Practical technical articles produced by AISC 's Steel Solutions C enter. Quality Corner Insights into AISC 's Quality C ertification program. Career Resources A collection of articles relating to professional development. Steel Utilities A forum for posting and downloading software tools. Steel Interchange Answers to technical questions posed by MSC readers and others to the AISC Steel Solutions C enter. Steel Availability Find structural shapes in common grades of steel. Career Classifieds Employment opportunities and career services. Product Directory Find software, products, and services. Industry Links C ontact information for professional organizations. Twitter Follow us on Twitter. Photo Gallery Browse images in addition to those printed in the magazine.

Answer
There are guidelines pertaining to gusset plate buckling in the 3rd edition LRFD Manual. For instance, the effective length factor K can be 0.5 if the gusset plate is supported on two edges. If it is supported on one edge, a K of 1.2 would be more appropriate (see page 13-32). With respect to the effective length, it is usually conservative to take the perpendicular distance of the Whitmore section 's spread end to the interior corner of the gusset plate. Alternatively, there is a method discussed in the new manual that uses the average of three distances to determine the effective length of the gusset plate. The radius of gyration is determined by

Links: C ontact information for professional organizations. Twitter Follow us on Twitter. Photo Gallery Browse images in addition to those printed in the magazine. Answer There are guidelines pertaining to gusset plate buckling in the 3rd edition LRFD Manual. For instance, the effective length factor K can be 0.5 if the gusset plate is supported on two edges. If it is supported on one edge, a K of 1.2 would be more appropriate (see page 13-32). With respect to the effective length, it is usually conservative to take the perpendicular distance of the Whitmore section 's spread end to the interior corner of the gusset plate. Alternatively, there is a method discussed in the new manual that uses the average of three distances to determine the effective length of the gusset plate. The radius of gyration is determined by taking the square root of I/A about the weak-axis of the gusset plate. The term pertaining to the width of the plate is cancelled in the calculation, as it is used in both the numerator and denominator. This is handy, as a tapered gusset plate does not complicate the calculation for r. Tables 3-36 and 3-50 in the 1999 LRFD Specification can be used to determine the design critical stress of the gusset plate for various KL/r values. Sergio Zoruba, Ph.D. American Institute of Steel Construction Chicago, IL Posted on May 1, 2002 Please feel free to submit a question/answer to [e-mail] Home | Advertising | Contact Us © 2011 Modern Steel Construction. A ll Rights Reserved A merican Institute of Steel Construction, Inc. O ne East Wacker Dr., Suite 700 Chicago, IL 60601 converted by Web2PDFConvert.com