Free Online Education Presentations

Browse from hundreds of recorded presentations from ACI Conventions and other concrete industry events.

This Week's Featured Presentation

Post-Fire Flexural Testing and Rating of Prestressed Concrete Bridge Girders
by Nur Yazdani, University of Texas at Arlington; and Eyosias Beneberu, Bridgefarmer & Associates

Presentation details

Fire and Flood Design, Performance, Mitigation, and Strengthening for Concrete Bridges (ACI Fall 2019 Convention, Cincinnati, OH) Significant investigations have been conducted on the effect of extreme load events, such as earthquake, wind and flood on bridges, as compared to fire hazards, even though fire can cause significant economic and public impacts. To bridge this knowledge gap, a full-scale one span prestressed concrete bridge was tested under a combined hydrocarbon fire and simulated AASHTO live load. The superstructure comprised of three standard I-girders, precast deck panels, cast-in-place deck, and elastomeric bearing pads. One girder was wrapped with carbon fiber reinforced polymer (CFRP), another with CFRP and sprayed fireproofing and a third was without CFRP or fireproofing. The test was conducted for 60 minutes and the fire temperature reached as high as 1131oC. It was found that the fireproofing was helpful in lowering the temperature at the CFRP-concrete interface, thereby preserving the integrity of the CFRP bonding, the concrete substrate, and prestressing steel. Without fireproofing, the CFRP quickly debonded, thereby causing significant concrete spalling and loss of some prestressing strands. Following the fire test, the deck was saw cut and each girder was tested in the laboratory under a three-point bending set-up to determine their residual strengths. The CFRP girder without fireproofing lost 59% of its design flexural capacity, while the one with fireproofing did not experience any reduction in flexural capacity. The results of the load testing and rating of each girder will be presented.

Upcoming Presentation

September 28 - October 4

Blast Response Limits for Load-Bearing Prestressed Concrete Panels
by Thomas Mander, University of Texas at San Antonio

Presentation details

Blast Resistance of Precast Concrete (ACI Fall 2018 Convention, Las Vegas, NV) This presentation proposes design response limits for load-bearing prestressed concrete wall panels, based on a series of full-scale shock tube tests and dynamic analysis. The panels tested included 6 inch thick solid prestressed concrete panels, and prestressed concrete sandwich panels with 3 inch thick wythes separated with 2 inches of rigid insulation. Static axial load was sustained on the top of the panels in the dynamic shock tube tests, ranging from 5 and 10 percent of the gross static axial capacity of each wall. Test results are summarized, along with SDOF analytical comparisons, which were used to develop load-bearing prestressed concrete blast response criteria.

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