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http://dx.doi.org/10.4334/JKCI.2010.22.6.777

An Experimental Study on Flexural Behavior of Steel Fiber Reinforced Ultra High Performance Concrete Prestressed Girders  

Yang, In-Hwan (Dept. of Civil Engineering, Kunsan National University)
Joh, Chang-Bin (Dept. of Structures & Bridges, Korea Institute of Construction Technology)
Kim, Byung-Suk (Dept. of Structures & Bridges, Korea Institute of Construction Technology)
Publication Information
Journal of the Korea Concrete Institute / v.22, no.6, 2010 , pp. 777-786 More about this Journal
Abstract
This paper examines the flexural behavior of full-scale prestressed concrete girders that were constructed of steel fiber reinforced ultra high performance concrete (UHPC). This study is designed to provide more information about the bending characteristics of UHPC girders in order to establish a reasonable prediction model for flexural resistance and deflection for future structural design codes. Short steel fibers have been introduced into prestressed concrete T-girders in order to study their effects under flexural loads. Round straight high strength steel fibers were used at volume fraction of 2%. The girders were cast using 150~190 MPa steel fiber reinforced UHPC and were designed to assess the ability of steel fiber reinforced UHPC to carry flexural loads in prestressed girders. The experimental results show that steel fiber reinforced UHPC enhances the cracking behavior and ductility of beams. Moreover, when ultimate failure did occur, the failure of girders composed of steel fiber reinforced UHPC was observed to be precipitated by the pullout of steel fibers that were bridging tension cracks in the concrete. Flexural failure of girders occurred when the UHPC at a particular cross section began to lose tensile capacity due to steel fiber pullout. In addition, it was determined that the level of prestressing force influenced the ultimate load capacity.
Keywords
ultra high performance concrete (UHPC); steel fibers; prestressed girders; crack; deflection;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
연도 인용수 순위
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