Application of hybrid SHCC and GFRP strips for enhancing structural performance of RC beams with cut web opening

Mohamed Ghalla , Jong Wan Hu , Galal Elsamak , Moataz Badawi , Ramy I. Shahin , Fathi A. Abdelmgeed

Abstract

The introduction of web openings in reinforced concrete (RC) beams to accommodate modern building utilities often compromises their structural performance due to stress discontinuities and reduced stiffness. This study investigates a novel hybrid strengthening approach combining strain-hardening cementitious composites (SHCC) with glass fiber-reinforced polymer (GFRP) strips to enhance the capacity and ductility of beams with web openings. Nine beams were tested under various configurations, including anchored and non-anchored systems with single and double strengthening layers. Results indicate significant improvements in load-bearing capacity, crack control, and ductility for strengthened specimens, particularly in configurations utilizing double-layer anchored strips. Beams strengthened with double-layer anchored configurations exhibited the highest improvement in load-bearing capacity and crack control, achieving up to 82% enhancement in ultimate load. Finite element modeling validated the experimental findings, enabling detailed parametric studies. The hybrid system demonstrates a cost-effective and practical solution for retrofitting RC beams, paving the way for advanced rehabilitation practices in structural engineering.

Key Words

crack control; finite element analysis; glass fiber-reinforced polymer; load bearing capacity; strain hardening cementitious composite; web openings

Address

Mohamed Ghalla — Civil Engineering Department, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh, Egypt
Jong Wan Hu — 1)Department of Civil and Environmental Engineering, Incheon National University, Incheon 22012, South Korea 2) Incheon Disaster Prevention Research Center, Incheon National University, Incheon 22012, South Korea
Galal Elsamak — Civil Engineering Department, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh, Egypt
Moataz Badawi — Civil Engineering Department, College of Engineering and Architecture, Umm Al-Qura University, Makkah, Saudi Arabia
Ramy I. Shahin — Civil Engineering Department, Higher Institute of Engineering and Technology, Kafrelsheikh, Egypt
Fathi A. Abdelmgeed — Civil Engineering Department, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh, Egypt

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