Effect of Fiber Content Variation in Plastic Hinge Region of Reinforced UHPC Flexural Members

Mandeep Pokhrel, Yi Shao, Sarah Billington, Matthew J. Bandelt

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations


Ultra-high performance concrete (UHPC) is used for the construction of resilient structures that can sustain dynamic loadings such as blast, impact, and earthquake loadings, among others. In structural components subjected to such loading, it is essential to ensure the formation of a ductile plastic hinge mechanism for suitable load transfer mechanisms and global stability of the structure. Experimental research is needed to understand the formation of plastic hinges in UHPC materials and the impact of plastic hinges on the rotation capacity of reinforced UHPC structural components. The study presented herein aims to understand the spread of plasticity and formation of plastic hinge regions in reinforced UHPC flexural members. Two reinforced UHPC beams with variation in fiber volume fraction (i.e., Vf = 1% and 2%) were subjected to monotonic loading. The test results demonstrated that the reinforcement plasticity length increased by 26% with a decrease in fiber volume fraction from 2% to 1%. The plastic hinge region of specimens with 2% fiber content had crack localization within the maximum moment region, whereas the specimen with 1% fiber content had a more uniformly distributed localized crack pattern. Further, analytical models and a recently proposed equivalent plastic hinge length equation were used to predict and compare the flexural strength and rotation values at various damage states.

Original languageEnglish (US)
Title of host publicationFibre Reinforced Concrete
Subtitle of host publicationImprovements and Innovations - RILEM-fib International Symposium on FRC BEFIB in 2020
EditorsPedro Serna, Aitor Llano-Torre, José R. Martí-Vargas, Juan Navarro-Gregori
PublisherSpringer Science and Business Media B.V.
Number of pages14
ISBN (Print)9783030584818
StatePublished - 2021
EventRILEM-fib International Symposium on FRC, BEFIB 2020 - Valencia, Spain
Duration: Sep 21 2020Sep 23 2020

Publication series

NameRILEM Bookseries
ISSN (Print)2211-0844
ISSN (Electronic)2211-0852


ConferenceRILEM-fib International Symposium on FRC, BEFIB 2020

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials


  • Fiber content
  • Plastic hinge length
  • Reinforced UHPC
  • Ultimate rotation capacity


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