Significance of cracking uncertainty on predicting deflection of FRC-RC beams

J. J. Kim, A. M. Said, M. M.Reda Taha

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

2 Scopus citations


This paper presents an alternative approach to examine uncertainty in predicting deflections of fiber-reinforced polymer-reinforced concrete (FRP-RC) beams. The use of nonspecificity of concrete cracking as a measure of cracking variability is proposed. Non-specificity is a type of uncertainty associated with having multiple alternatives to define variables (e.g. modulus of rupture, tensile strength to describe cracking). Nonspecificity in cracking can be described by considering cracking strength interval. Using a cracking strength interval, deflection intervals of FRP-RC beams are calculated. Deflection is modeled using cracked plane frame analysis integrated with recent models describing concrete tension stiffening with fiber reinforced polymers (FRP) reinforcement. A deflection database of FRP-RC beams is developed and examined. The uncertainty in deflection prediction is evaluated by comparing the measured deflection from the database with respect to the predicted deflection interval. The significance of deflection prediction parameters on the uncertainty in predicting deflection of FRP-RC beams was analyzed. It is shown that when the applied moment to cracking moment ratio gets close to unity, the uncertainty in predicting deflection of concrete beams reinforced with FRP increases.

Original languageEnglish (US)
Title of host publicationServiceability of Concrete Members Reinforced with Internal/External FRP Reinforcement - Session at the ACI Spring 2009 Convention
Number of pages14
Edition264 SP
StatePublished - 2009
EventACI Spring 2009 Convention - San Antonio, TX, United States
Duration: Mar 15 2009Mar 19 2009

Publication series

NameAmerican Concrete Institute, ACI Special Publication
Number264 SP
ISSN (Print)0193-2527


OtherACI Spring 2009 Convention
Country/TerritoryUnited States
CitySan Antonio, TX

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)


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