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Quasi-Balanced Failure Approach for Evaluating Moment Capacity of FRP Underreinforced Concrete Beams |
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| Authors: | Kyoung-Kyu Choi Girum Urgessa Mahmoud M. Reda Taha Arup K. Maji |
| Affiliation: | 1BK Research Professor, Dept. of Architectural Engineering, Dankook Univ., Suji, Yongin-city, Gyeonggi-do 448-701, Republic of Korea. 2Assistant Professor, Dept. of Civil, Environmental and Infrastructure Engineering, George Mason Univ., 4400 University Drive MS 6C1, Fairfax, VA 22030. 3Assistant Professor and Regent’s Lecturer, Dept. of Civil Engineering, Univ. of New Mexico, MSC01 1070, 124 Tapy Hall, 1 University of New Mexico, Albuquerque, NM 87131-0001. 4Professor and Chair, Dept. of Civil Engineering, Univ. of New Mexico, MSC01 1070, 209 Tapy Hall, 1 University of New Mexico, Albuquerque, NM 87131-0001. |
| Abstract: | Failure of concrete beam sections underreinforced with fiber-reinforced polymer (FRP) is initiated by FRP rupture before concrete crushing. In such a case, the typical rectangular stress block based on the balanced failure mechanism may not apply. In the present study, rigorous sectional analyses are performed implementing existing concrete stress-strain models for a wide range of values of design parameters. Based on the results of the numerical analyses, the variation of parameters of equivalent stress block of concrete was investigated, and an alternative, yet simple, design method for evaluating moment-carrying capacity of FRP underreinforced concrete beam using quasi-balanced failure approach was developed. The proposed design method was verified by comparing the predicted moment-carrying capacity with existing test results. |
| Keywords: | Flexural strength Concrete beams Structural design Nonlinear analysis Fiber reinforced polymers Reinforcement |