TY - JOUR
T1 - Lateral torsional buckling of ultra-high-performance fibre-reinforced concrete girders
AU - Lee, Keesei
AU - Andrawes, Bassem
AU - Lee, Jeonghwa
AU - Kang, Young Jong
N1 - Funding Information:
This research was supported by the Basic Science Research Program (grant number NRF-2015R1C1A1A01052250) through the National Research Foundation of Korea, funded by the Ministry of Science, ICT & Future Planning.
Publisher Copyright:
© 2019 ICE Publishing: All rights reserved.
PY - 2020/8/1
Y1 - 2020/8/1
N2 - Ultra-high-performance fibre-reinforced concrete (UHPFRC) is a relatively newly developed construction material that not only has high compressive strength (greater than 150 MPa), but also high tensile strength (10-20 MPa). The use of UHPFRC enables the design of slender structural members; hence, instability could become a major governing failure mode. However, the estimation of buckling strength for a concrete structure is not easy, owing to its material characteristics. In this paper, the lateral torsional bucking behaviour and strength of ultra-high-performance concrete I-beams are discussed. A methodology is introduced to obtain the effective moment of inertia of UHPFRC I-beams, considering tensile cracks. By using the effective moment of inertia, the linear elastic buckling strength can be calculated. In addition, the inelastic lateral torsional buckling behaviour is investigated through finite-element analysis. A generalised buckling strength curve with a slenderness parameter is discussed. As a result, the limitations for classification of compact and non-compact members are defined, and lateral torsional buckling strength equations are suggested for a simply supported UHPFRC I-girder subjected to centre point loading. Several experimental studies were also conducted, and the results are applied to verify the final results.
AB - Ultra-high-performance fibre-reinforced concrete (UHPFRC) is a relatively newly developed construction material that not only has high compressive strength (greater than 150 MPa), but also high tensile strength (10-20 MPa). The use of UHPFRC enables the design of slender structural members; hence, instability could become a major governing failure mode. However, the estimation of buckling strength for a concrete structure is not easy, owing to its material characteristics. In this paper, the lateral torsional bucking behaviour and strength of ultra-high-performance concrete I-beams are discussed. A methodology is introduced to obtain the effective moment of inertia of UHPFRC I-beams, considering tensile cracks. By using the effective moment of inertia, the linear elastic buckling strength can be calculated. In addition, the inelastic lateral torsional buckling behaviour is investigated through finite-element analysis. A generalised buckling strength curve with a slenderness parameter is discussed. As a result, the limitations for classification of compact and non-compact members are defined, and lateral torsional buckling strength equations are suggested for a simply supported UHPFRC I-girder subjected to centre point loading. Several experimental studies were also conducted, and the results are applied to verify the final results.
KW - Beams & girders
KW - Failure
KW - Structural analysis
UR - http://www.scopus.com/inward/record.url?scp=85089513626&partnerID=8YFLogxK
U2 - 10.1680/jmacr.18.00180
DO - 10.1680/jmacr.18.00180
M3 - Article
AN - SCOPUS:85089513626
VL - 72
SP - 820
EP - 836
JO - Magazine of Concrete Research
JF - Magazine of Concrete Research
SN - 0024-9831
IS - 16
ER -