Seismic behavior of slab-column connections with varying flexural reinforcement ratio

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Abstract

This paper presents the results of three flat slab specimens with varying flexural reinforcement ratio tested under constant gravity load and reversed horizontal cyclic loading. The tests are a continuation of the experimental work conducted at FCT/UNL during the last years on specimens with the same overall geometry (4.15 × 1.85 × 0.15 m3) and test setup. In contrast to past tests, in which all the specimens were reinforced with a nearly 1% flexural reinforcement ratio, the new specimens presented herein have a flexural reinforcement ratio varying from 0.64% (two specimens) to 1.34% (one specimen). One of the specimens with low flexural reinforcement ratio was also reinforced with headed studs whereas the other two specimens had no punching shear reinforcement. The magnitude of the gravity loads was chosen such that the ratio between the gravity load and the concentric punching shear resistance remained comparable to that of previously tested specimens at FCT/UNL: around 50%. It is shown that the presence of headed studs leads to a significant improvement of the displacement capacity of slab-column connections, as it was previously observed in tests on specimens with 1% flexural reinforcement ratio. The drift capacity of specimens without punching shear reinforcement was significantly lower.

Original languageEnglish
Title of host publicationConcrete Structures: New Trends for Eco-Efficiency and Performance
Subtitle of host publicationProceedings of fib symposium 2021
EditorsEduardo Júlio, Jónatas Valença, Ana Sofia Louro
Place of PublicationLisboa
Publisherfib. The International Federation for Structural Concrete
Pages987-994
Number of pages8
ISBN (Print)978-294064308-0
Publication statusPublished - 2021
Event2021 fib Symposium of Concrete Structures: New Trends for Eco-Efficiency and Performance - Virtual, Lisbon, Portugal
Duration: 14 Jun 202116 Jun 2021

Conference

Conference2021 fib Symposium of Concrete Structures: New Trends for Eco-Efficiency and Performance
Country/TerritoryPortugal
CityVirtual, Lisbon
Period14/06/2116/06/21

Keywords

  • Cyclic loading
  • Flat slab
  • Flexural reinforcement
  • Punching
  • Seismic behavior

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