Hybrid use of HPFRC in slab: column connections under cyclic lateral loading

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Abstract

Punching shear reinforcement has already proved to be a reliable solution to improve the deformation capacity of flat slab – column connections subjected to seismic actions. Alternative approaches are becoming attractive with the development of materials such as High-Performance Fibre Reinforced Concrete (HPFRC) with better performance in tension and compression compared to conventional concrete. Motivated by the promising results obtained during an experimental campaign on hybrid HPFRC flat slabs under monotonic centred vertical loading, this paper investigates the possibility of using HPFRC to improve the behaviour of flat slabs under lateral loading (such as during earthquakes). Four reversed horizontal cyclic loading tests, under constant gravity loads, are presented. The flexural reinforcement ratio, the extent of HPFRC zone from the face of the column and the gravity load were the experimental variables considered. Results show that HPFRC can be a promising alternative to conventional punching shear reinforcement in slab column connections subjected to seismic actions, leading to increased deformation capacity. Furthermore, the results show that even a small extent of the HPFRC zone (up to 1.5 times from the face of the column) can lead to significant benefits in terms of seismic behaviour of slab – column connections, opening the possibility for an optimization of use of HPFRC.

Original languageEnglish
Title of host publicationProceedings for the 6th fib International Congress, 2022
Subtitle of host publicationConcrete Innovation for Sustainability
EditorsStine Stokkeland, Henny Cathrine Braarud
Publisherfib. The International Federation for Structural Concrete
Pages1880-1889
Number of pages10
ISBN (Print)978-294064315-8
Publication statusPublished - 2022
Event6th fib International Congress on Concrete Innovation for Sustainability, 2022 - Oslo, Norway
Duration: 12 Jun 202216 Jun 2022

Publication series

Namefib Symposium
Publisherfib. The International Federation for Structural Concrete
ISSN (Print)2617-4820

Conference

Conference6th fib International Congress on Concrete Innovation for Sustainability, 2022
Country/TerritoryNorway
CityOslo
Period12/06/2216/06/22

Keywords

  • cyclic loading
  • flat plate
  • flat slab
  • high performance fibre reinforced concrete
  • HPFRC
  • punching
  • seismic loading
  • shear
  • slab – column connection

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