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논문 기본 정보

자료유형
학술저널
저자정보
Pegah Behinaein (Heriot-Watt University) Demetrios M. Cotsovos (Heriot-Watt University) Ali A. Abbas (University of East London)
저널정보
한국계산역학회 Computers and Concrete, An International Journal Computers and Concrete, An International Journal Vol.22 No.3
발행연도
2018.1
수록면
337 - 353 (17page)

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The present study focuses on examining the structural behaviour of steel-fibre-reinforced concrete (SFRC) beams under high rates of loading largely associated with impact problems. Fibres are added to the concrete mix to enhance ductility and energy absorption, which is important for impact-resistant design. A simple, yet practical non-linear finite-element analysis (NLFEA) model was used in the present study. Experimental static and impact tests were also carried out on beams spanning 1.3 meter with weights dropped from heights of 1.5 m and 2.5 m, respectively. The numerical model realistically describes the fullybrittle tensile behaviour of plain concrete as well as the contribution of steel fibres to the post-cracking response (the latter was allowed for by conveniently adjusting the constitutive relations for plain concrete, mainly in uniaxial tension). Suitable material relations (describing compression, tension and shear) were selected for SFRC and incorporated into ABAQUS software Brittle Cracking concrete model. A more complex model (i.e., the Damaged Plasticity concrete model in ABAQUS) was also considered and it was found that the seemingly simple (but fundamental) Brittle Cracking model yielded reliable results. Published data obtained from drop-weight experimental tests on RC and SFRC beams indicates that there is an increase in the maximum load recorded (compared to the corresponding static one) and a reduction in the portion of the beam span reacting to the impact load. However, there is considerable scatter and the specimens were often tested to complete destruction and thus yielding post-failure characteristics of little design value and making it difficult to pinpoint the actual load-carrying capacity and identify the associated true ultimate limit state (ULS). To address this, dynamic NLFEA was employed and the impact load applied was reduced gradually and applied in pulses to pinpoint the actual failure point. Different case studies were considered covering impact loading responses at both the material and structural levels as well as comparisons between RC and SFRC specimens. Steel fibres were found to increase the load-carrying capacity and deformability by offering better control over the cracking process concrete undergoes and allowing the impact energy to be absorbed more effectively compared to conventional RC members. This is useful for impact-resistant design of SFRC beams.

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참고문헌 (32)

참고문헌 신청
ABAQUS / 2018 / Version 6.12-3 Documentation google schola Abbas, A.A. / 2010 / Structural response of RC wide beams under low-rate and impact loading / Mag. Concrete Res. 62:723~740 Crossref Abbas, A.A. / 2016 / A simplified finite element model for assessing steel fibre reinforced concrete structural performance / Comput. Struct. 173:31~49 Crossref Abbas, A.A. / 2014 / Seismic response of steel fibre reinforced concrete beam-column joints / Eng. Struct. 59:261~283 Crossref Abbas, A.A. / 2014 / Shear behaviour of SFRC simply-supported beams / ICE Proc. Struct. Build. 167(SB9):544~558 Crossref

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