### Abstract

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 language | English (US) |
---|---|

Title of host publication | Serviceability of Concrete Members Reinforced with Internal/External FRP Reinforcement - Session at the ACI Spring 2009 Convention |

Pages | 179-192 |

Number of pages | 14 |

Edition | 264 SP |

State | Published - 2009 |

Event | ACI Spring 2009 Convention - San Antonio, TX, United States Duration: Mar 15 2009 → Mar 19 2009 |

### Other

Other | ACI Spring 2009 Convention |
---|---|

Country | United States |

City | San Antonio, TX |

Period | 3/15/09 → 3/19/09 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

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

### Cite this

*Serviceability of Concrete Members Reinforced with Internal/External FRP Reinforcement - Session at the ACI Spring 2009 Convention*(264 SP ed., pp. 179-192)

}

*Serviceability of Concrete Members Reinforced with Internal/External FRP Reinforcement - Session at the ACI Spring 2009 Convention.*264 SP edn, pp. 179-192, ACI Spring 2009 Convention, San Antonio, TX, United States, 3/15/09.

**Significance of cracking uncertainty on predicting deflection of FRC-RC beams.** / Kim, J. J.; Said, Aly Marei; Taha, M. M Reda.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Significance of cracking uncertainty on predicting deflection of FRC-RC beams

AU - Kim, J. J.

AU - Said, Aly Marei

AU - Taha, M. M Reda

PY - 2009

Y1 - 2009

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=77952657011&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77952657011&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:77952657011

SN - 9781615678273

SP - 179

EP - 192

BT - Serviceability of Concrete Members Reinforced with Internal/External FRP Reinforcement - Session at the ACI Spring 2009 Convention

ER -