Title:
Flexural Behavior of Ultra-High-Performance Fiber-Reinforced Concrete Moment Connection for Precast Concrete Decks
Author(s):
Jun Ki Lee and Seung Hoon Lee
Publication:
Structural Journal
Volume:
112
Issue:
4
Appears on pages(s):
451-462
Keywords:
closure pour; deck; joint; precast concrete; splice length; steel fiber; ultra-high-performance fiber-reinforced concrete
DOI:
10.14359/51687657
Date:
7/1/2015
Abstract:
This paper presents an experimental investigation of the flexural behavior of precast concrete moment connections filled with ultra-high-performance fiber-reinforced concrete (UHPFRC). The experimental program consisted of two phases. First, the bonding performance of steel reinforcing bars embedded in the UHPFRC was evaluated using lap-spliced beam specimens with three different volumes of steel fibers. Second, the flexural behavior of the UHPFRC moment connections was investigated using 14 precast concrete beam specimens. The precast connections had a narrow joint width ranging from 250 to 100 mm (10 to 4 in.) and included three feasible noncontact splice details: straight bars, 90-degree hooked bars, and U-loop bars. Test results demonstrated the remarkable bonding characteristics of UHPFRC. The precast
specimens with a joint width larger than 150 mm (6 in.) exhibited flexural behavior equivalent to that of a monolithic concrete beam specimen. Also, the anchorage provided by the hooked bars and U-loop bars did not appreciably contribute to the bonding strength.