Abstract
Nowadays, using infill isolators in Reinforced Concrete (RC) structures is very common. In earlier research this infill isolators are usually considered as non-structural elements, but in recent researches it was demonstrated that infill has considerable effects on natural period, stiffness, strength and overall behavior of structure specially when it is subjected to seismic ground motions. In this study a one-bay two-story masonry infilled RC frame is considered for a laboratory sample and various layouts of Carbon Fiber Reinforced Polymer (CFRP) layers have been used to retrofit and strengthen of masonry infill wall. These specimens have been modeled in ABAQUS and analyzed under cyclic loading with Finite Element Method (FEM). FEM analysis have been carried out using ABAQUS/Explicit software and analysis type have been chosen dynamic explicit. Finally, results of Finite Element Analysis have been compared against the experimental results. The effect of different CFRP configurations of retrofitting on ductility, ultimate lateral load capacity, stiffness and energy dissipation capacity of specimens have been discussed. Thereupon the best configuration has been proposed in terms of cost effectiveness and ductility. The results showed that in the frame with infill wall comparing with bare frame, load capacity increased about 277.35% and by comparing infilled frame with or without CFRP, it can be concluded that using CFRP can increase lateral load capacity of masonry infilled RC frames.
Highlights
Earthquakes over a long time has been identified as the most destructive natural disasters in all over the world
The range of height was from 400 mm to 2000 mm. He retrofitted two samples with Glass Fiber Reinforced Polymer (GFRP) sheets and reinforced with GFRP and Carbon Fiber Reinforced Polymer (CFRP) bars in order to compare the behavior of Reinforced Concrete (RC) beams
By comparing the hysteresis curves of samples and 2, it can be concluded that in the case of infill wall, the specimen 2 has an increase in the bearing capacity in the first and second floors, respectively, by 69.41% and 70.75% compared without infill wall
Summary
Earthquakes over a long time has been identified as the most destructive natural disasters in all over the world. El-Dakhakhni et al (2004) evaluated seismic retrofitting of unreinforced concrete-masonry infilled steel frames using glass fiber reinforced polymer laminates under cyclic loading. Erol and Karadogan (2016) did an investigation about the seismic strengthening of non-structural brittle masonry infill walls of reinforced concrete frames by Carbon Fiber Reinforced Polymers (CFRP). Akin et al (2011) retrofitted 8 reinforced concrete frames; one frame by two stories with two different ratio dimensions, 1.3 scales with (CFRP) carbon fiber reinforced polymer layers and tested under cyclic loading condition. The range of height was from 400 mm to 2000 mm He retrofitted two samples with GFRP sheets and reinforced with GFRP and CFRP bars in order to compare the behavior of RC beams. Sakr et al (2017) investigated the behavior of CFRP retrofitted infilled RC frames with a finite element micro model. The FRP thickness for all models is 0.5 mm
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