In this quarterly IBT/ABC-UTC Research Seminar, Royce Floyd, Ph.D., P.E., S.E., Principal Investigator and Associate Professor of Civil Engineering and Environmental Science, University of Oklahoma; and Omar Yadak, Graduate Research Assistant, School of Civil Engineering and Environmental Science, University of Oklahoma, present work related to the Prestress Losses in UHPC and Hybrid Precast, Prestressed Bridge Girders.

Earn 1-hour Certificate of Attendance (https://abc-utc.fiu.edu/webinars/certificates-of-attendance/)

Click to Register 

Description:
Precast, prestressed concrete bridge girders are used extensively in conventional and accelerated bridge construction. End region behavior of prestressed concrete girders has been a significant concern warranting numerous studies over the years focused on stress limits, prestress transfer length, cracking caused by the prestress, and shear capacity. Ultra-high performance concrete (UHPC) is a relatively recent advancement in cementitious composite materials with mechanical and durability properties far exceeding those of conventional concrete. These improved mechanical properties have the potential to mitigate the impacts of high stresses in prestressed girder end regions and to provide greater overall girder capacity. However, little research has been conducted on the behavior of hybrid girders using UHPC in the end region or as a stay-in-place formwork shell. A total of five hybrid, four full UHPC, and two UHPC shell prestressed girder specimens were cast and instrumented to measure prestress losses over time. The results are being used to develop predictions for prestress loss behavior and recommendations for girder end region detailing.

Presenters:

Presentation Graphics:

Figure 1. Beam formwork showing insert to reduce the web thickness and vibrating wire strain gage

Figure 2. UHPC end region cast simultaneously with conventional self-consolidating concrete

Figure 3. Trial UHPC shell to evaluate bond between shell and infill concrete 

Figure 4.  Failure of trial UHPC shell specimen showing no debonding between the materials

Question & Answer Period: Submit your questions when you register for the seminar and also in the question box during the seminar. (15 minutes)

Certificate of Attendance: Each site registered for this seminar will receive an email for your response. Just click the first link in the email to obtain a certificate. For multiple participants at a site, the point-of-contact registrant for that site also clicks the second link in the email, logs in, and clicks “Attendees” to provide first name, last name, and email address for each participant at that site; each participant will then receive an automatic email with link to print an individual certificate. Accessing the second link in the email will also allow participants to print certificates for past seminars that were attended by simply clicking the seminar title. Please let Ms. Ankitha Arvan at FIU know if you have questions or need assistance with receiving your certificate. Ankitha’s email address is ejuarez@fiu.edu.

For more information: Please contact us by sending an email to abc@fiu.edu.