Behaviour of steel-fibre-reinforced concrete beams under high-rate loading

Article


Abbas, A., Cotsovos, Demetrios M. and Behinaein, Pegah 2018. Behaviour of steel-fibre-reinforced concrete beams under high-rate loading. Computers and Concrete, An International Journal. 22 (3), pp. 337-353.
AuthorsAbbas, A., Cotsovos, Demetrios M. and Behinaein, Pegah
Abstract

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 fully-brittle 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.

JournalComputers and Concrete, An International Journal
Journal citation22 (3), pp. 337-353
ISSN1598-8198
1598-818X
Year2018
PublisherTechno-Press
Accepted author manuscript
License
Digital Object Identifier (DOI)doi:10.12989/cac.2018.22.3.337
Publication dates
Print25 Sep 2018
Publication process dates
Deposited22 Oct 2018
Accepted13 Sep 2018
Accepted13 Sep 2018
Copyright information© 2018 Techno-Press
Permalink -

https://repository.uel.ac.uk/item/84693

  • 15
    total views
  • 8
    total downloads
  • 3
    views this month
  • 2
    downloads this month

Related outputs

Ductility of Steel-Fibre-Reinforced Recycled Lightweight Concrete
Al-Naimi, H. and Abbas, A. 2019. Ductility of Steel-Fibre-Reinforced Recycled Lightweight Concrete. in: Papadrakakis, M. and Fragiadakis, M. (ed.) COMPDYN 2019 Proceedings: 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering Institute of Structural Analysis and Antiseismic Research.
A simplified finite element model for assessing steel fibre reinforced concrete structural performance
Abbas, A., Syed Mohsin, Sharifah M. and Cotsovos, Demetrios M. 2016. A simplified finite element model for assessing steel fibre reinforced concrete structural performance. Computers and Structures. 173, pp. 31-49.
Shear behaviour of steel-fibre-reinforced concrete simply supported beams
Abbas, A., Syed Mohsin, Sharifah M., Cotsovos, Demetrios M. and Ruiz-Teran, Ana M. 2014. Shear behaviour of steel-fibre-reinforced concrete simply supported beams. Proceedings of the ICE - Structures and Buildings. 167 (9), pp. 544-558.
Statically-Indeterminate SFRC Columns under Cyclic Loads
Abbas, A., Mohsin, Sharifah, Cotsovos, Demetrios and Ruiz-Teran, Ana 2014. Statically-Indeterminate SFRC Columns under Cyclic Loads. Advances in Structural Engineering. 17 (10), pp. 1403-1418.
Seismic response of steel fibre reinforced concrete beam-column joints
Abbas, A., Syed Mohsin, Sharifah M. and Cotsovos, Demetrios M. 2014. Seismic response of steel fibre reinforced concrete beam-column joints. Engineering Structures. 59 (Feb14), pp. 261-283.