TRB Webinar: Classifying Fracture Critical Members

June 07, 2018 02:00 PM - 04:00 PM U.S. Eastern
Cost (for your seat)
Professional Development Hours for this webinar
2.0 hour(s)
Continuing Education Hours for this webinar
AAE: 0.0 hour(s)
AICP: 0.0 hour(s)
CLE: 0.0 hour(s)

TRB will conduct a webinar on Thursday, June 7, 2018 from 2:00 PM to 4:00P M ET that that will discuss the concept of fracture critical members (FCMs) in steel bridges. Over the past decade, there have been various notions about what constitutes an FCM, but it was not clearly defined. This webinar will present recent research and specifications on methods to establish if a member should be classified as an FCM or not.  Presenters will provide background to the development of the proposed guide and provide examples about how to evaluate internal member-level redundancy of mechanically-fastened built-up steel members. This webinar will also explore how the proposed guide specifications could be applied to twin tub girder bridges in the context of system behavior.

This webinar was organized by the TRB Standing Committee on Steel Bridges. 

Some registrants will need to pay $95 to attend this webinarSign into to view registration information.

Webinar Presenters

  • Robert Connor, Purdue University
  • Matt Hebdon, Virginia Tech University
  • Jason Lloyd, Purdue University
  • Tom Murphy, Modjeski and Masters, Inc.

Moderated by:  Francisco Javier Bonachera Martin, Purdue University

Webinar Outline

  1. Overview of FCMs, 3D system analysis, and twin tub bridges
  2. 3D principles for flexure
  3. 3D principles in axial members
  4. Implementation of specifications
  5. Question and answer session

The first 90 minutes of the webinar will be for presentations and the final 30 minutes will be reserved for audience questions. The Registered Continuing Education Program (RCEP) categorizes this webinar activity as relating to health, safety, and welfare including core technical.

Learning Objectives

At the end of this webinar, participants will be able to:

  • Identify the history, issues, and current research on the topic of FCMs
  • Evaluate if a member should or should not be classified as an FCM
  • Describe the proposed American Association of State Highway and Transportation Officials (AASHTO) guide specifications and their objectives, use, and limitations
  • Design and detail main girders of twin tub bridges such that they need not be classified as FCMs

Professional Development Hour Information
A certificate for 2.0 Professional Development Hours (PDHs) will be provided to Professional Engineers (PEs) who register and attend the webinar as an individual. For groups, only the person that registers and attends the session will receive a PDH certificate. Certificates of Completion will be issued only to individuals who register for and attend the entire webinar session.

Individuals registered as Florida PEs are no longer required to email TRB with your license number to report your attendance. Instead, please use your certificate that TRB provides through as verification of your attendance to the Florida Board of Professional Engineers.

Please check with your licensing board to ensure that TRB webinar PDHs are approved by your board.

This webinar was developed in October 2017. TRB has met the standards and requirements of the Registered Continuing Education Program (RCEP). Credit earned on completion of this program will be reported to RCEP by TRB. Complaints about registered providers may be sent to RCEP, 1015 15th Street, NW, 8th Floor, Washington, DC 20005. Website:

Registration questions? Contact Reggie Gillum at