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Numerical simulation on structural behavior of UHPFRC beams with steel and GFRP bars

Title
Numerical simulation on structural behavior of UHPFRC beams with steel and GFRP bars
Author
류두열
Keywords
ultra-high-performance fiber-reinforced concrete; flexure; micromechanics; fiber orientation; reinforcement; finite element analysis
Issue Date
2015-11
Publisher
TECHNO-PRESS
Citation
COMPUTERS AND CONCRETE, v. 16, NO 5, Page. 759-774
Abstract
This study simulates the flexural behavior of ultra-high-performance fiber-reinforced concrete (UHPFRC) beams reinforced with steel and glass fiber-reinforced polymer (GFRP) rebars. For this, micromechanics-based modeling was first carried out on the basis of single fiber pullout models considering inclination angle. Two different tension-softening curves (TSCs) with the assumptions of 2-dimensional (2-D) and 3-dimensional (3-D) random fiber orientations were obtained from the micromechanics-based modeling, and linear elastic compressive and tensile models before the occurrence of cracks were obtained from the mechanical tests and rule of mixture. Finite element analysis incorporating smeared crack model was used due to the multiple cracking behaviors of structural UHPFRC beams, and the characteristic length of two times the element width (or two times the average crack spacing at the peak load) was suggested as a result of parametric study. Analytical results showed that the assumption of 2-D random fiber orientation is appropriate to a non-reinforced UHPFRC beam, whereas the assumption of 3-D random fiber orientation is suitable for UHPFRC beams reinforced with steel and GFRP rebars due to disorder of fiber alignment from the internal reinforcements. The micromechanics-based finite element analysis also well predicted the serviceability deflections of UHPFRC beams with GFRP rebars and hybrid reinforcements.
URI
http://121.183.206.200:8080/proto.board/articleContentView?page=article&journal=cac&volume=16&num=5&ordernum=6&site=korschttp://hdl.handle.net/20.500.11754/28636
ISSN
1598-8198; 1598-818X
DOI
10.12989/cac.2015.16.5.759
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ARCHITECTURAL ENGINEERING(건축공학부) > Articles
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