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Materials and Structures

, 51:167 | Cite as

Structural effects of FRC creep

  • Giovanni Plizzari
  • Pedro SernaEmail author
50 years of Materials and Structures
  • 117 Downloads
Part of the following topical collections:
  1. 50 years of Materials and Structures

Abstract

Research studies in the last 20 years allowed to obtain reliable rules for designing structures made of fiber reinforced concrete (FRC). However, design aspects like the long-term behavior of FRC, especially when synthetic fibers are adopted, require further research. Long-term behavior includes aging and creep. Aging represent the change of fiber properties into the concrete environment, which may reduce the structural bearing capacity; when present, it is an important issue for the structural safety, especially when fibers are the only reinforcement. Aging of fibers must be proven by experimental tests. Creep is a complex phenomenon, roughly considered by building codes even for traditional reinforced concrete (RC) structures. The introduction of fibers do not change anything in concrete matrix and, before cracking, in the material concrete creep behavior is not expected any change. After cracking, the structural effect of FRC creep depends on the degree of structural redundancy and on the presence of rebars since creep produces a stress redistribution in the structure or from FRC to the rebars. When FRC post-cracking resistance is necessary for equilibrium requirements, in structures with cracked sections in service conditions the structural deferred response has to be analyzed by considering the FRC creep behavior. When FRC is used for resisting secondary actions and rebars are present for equilibrium requirements, the response of a FRC element (with rebars and fibers) will be identical to a conventional RC; FRC contributes by controlling the crack development under both short and long term loading.

Keywords

Fiber reinforced concrete FRC creep Long term behavior Fiber aging Structural behaviour 

Notes

Acknowledgements

This paper was written independently by the Authors who are grateful to all members of RILEM TC-261 FCC for their constructive discussions on the state-of-the-art on FRC creep as well as on the creep test methodologies.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© RILEM 2018

Authors and Affiliations

  1. 1.University of BresciaBresciaItaly
  2. 2.Universitat Politècnica de ValènciaValènciaSpain

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