Abstract
Reinforced concrete (RC) walls are extensively used in high-rise buildings to resist lateral loads, while ensuring an adequate level of ductility. Durability problems, including corrosion of conventional steel reinforcements, necessitate exploring alternative types of reinforcement. The use of glass fiber reinforced polymer (FRP) bars is a potential solution. However, these bars cannot be used in seismic applications because of their brittleness and inability to dissipate seismic energy. Superelastic shape memory alloy (SMA) is a corrosion-free material with high ductility and unique self-centering ability. Its high cost is a major barrier to use in construction projects. The clear advantage of utilizing both SMA and FRP to achieve durable self-centering structures has motivated the development of a composite SMA-FRP bar. This paper investigates the hybrid use of FRP bars and either SMA bars or composite SMA-FRP in concrete shear walls. An extensive parametric study was conducted to study the effect of different design parameters on the lateral performance of hybrid RC walls. The seismic behavior of the hybrid walls was then examined. The hybrid walls not only solved the durability problem but also significantly improved the seismic performance.
Highlights
Reinforced concrete (RC) shear walls are commonly used as the lateral load system for residential and commercial buildings [1]
Results showed that GFRP rebars provide very competitive performance in comparison to steel rebars
Tobbi et al [6] examined the effects of key variables including tie configuration, tie spacing, and spalling of concrete cover on the structural performance of GFRP RC columns
Summary
Reinforced concrete (RC) shear walls are commonly used as the lateral load system for residential and commercial buildings [1] During seismic events, they are expected to provide adequate strength, stiffness, and ductility. Mohamed et al [7] conducted experimental tests on concrete walls reinforced with different configurations of FRP bars. Et al [10], Araki et al [11], Qiu and Zhu [12], and Sultana and Youssef [13] explored the use of SMA in the vertical bracing of RC and steel buildings The results of these studies highlighted the benefits of using SMA as a sustainable material. This paper aims to evaluate the seismic performance of concrete shear walls reinforced with hybrid SMA and FRP composites. The following sections provide details about the composite bar, considered walls, modeling technique, parametric study, and dynamic analysis results
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