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TRB Webinar: Using 0.7-inch Strands for Better Bridge Design

March 20, 2023

3:00 PM - 4:00 PM (EDT)

Past

Topics

For the first time, AASHTO Load-and-Resistance Factor Design (LRFD) Bridge Design Specifications will permit the use of 0.7-inch strands. The use of 0.7-inch strands could cut down on the number of strands in a girder, reduce the number of girders in a bridge, achieve longer spans, and allow the use of shallower girders for the same span length. TRB hosted a webinar on Monday, March 20, 2023 from 3:00 PM to 4:00 PM Eastern that presented the results of a multi-year, multi-organizational research program leading to AASHTO’s revision. Presenters discussed the benefits and considerations of moving to 0.7-inch strands, compared to 0.6-inch strands. Presenters also shared the challenges to application and special attention to end region detailing.

This webinar is based on NCHRP Research Report 994: Use of 0.7-in. Diameter Strands in Precast Pretensioned Girders.

This webinar was sponsored by TRB’s National Cooperative Highway Research Program.

The slides are linked in the meeting materials. View the recorded webinar below.

Webinar agenda and presenters

  1. Design case studies and overview of full-scale girder tests – Bahram Shahrooz, University of Cincinnati

  2. End region detailing and stability considerations – Kent Harries, University of Pittsburgh

  3. Question and answer session moderated by Richard Miller, University of Cincinnati

The first 40 minutes of the webinar were for presentations and the final 20 minutes was reserved for audience questions.

Learning Objectives

At the end of this webinar, participants are able to:

  1. Determine the cases for which 0.7-inch strands offer advantages over 0.6-inch strands

  2. Detail the end regions when 0.7-inch strands are used

  3. Identify the research leading to the revisions to AASHTO LRFD Bridge Design Specifications

Professional Development Hours

This webinar was delivered as a scheduled – e-learning live event and is categorized within RCEP as Technical, Health and Safety.

Professional Development Hours (PDHs) earned on completion of this program were reported to the Registered Continuing Education Program (RCEP). Certificates of Completion are issued to all participants via the RCEP.net online system. Complaints about registered providers may be addressed to RCEP, 1015 15th Street, NW, 8th Fl., Washington, DC, 20005.

Disclaimer

It is essential to the National Academies mission of providing evidence-based advice that participants in any of our meetings or events avoid political or partisan statements or commentary and maintain a culture of mutual respect. The statements and presentations during our meetings or events are solely those of the individual participants and do not necessarily represent the views of other participants or the National Academy of Sciences, which is a non-partisan, tax exempt organization that includes under its Charter the National Academy of Engineering and National Academy of Medicine, and that operates the National Research Council.

Contact

Contact us

TRB Webinar Program
trbwebinar@nas.edu

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