Seismic Retrofitting of Concrete Structures under Earthquake Loads Using Viscous Dampers: Modeling, Analysis, and Performance Evaluation

Seismic retrofitting of concrete structures against earthquake loads is one of the primary challenges in structural design. This paper investigates the impact of using viscous dampers to enhance the dynamic behavior and retrofitting of concrete buildings under seismic loads. Experiments conducted on concrete buildings equipped with viscous dampers demonstrate a significant reduction in applied moments and stresses on the structure compared to buildings without dampers. Specifically, the results showed that the use of viscous dampers reduced the moments by ۳۵% and the stresses in sensitive areas of the structure by up to ۳۰%. Moreover, an improvement in the buildings' natural frequency was observed in the presence of viscous dampers, which significantly enhances the stability and safety of the structures against earthquakes. The experimental results reveal that the natural frequency of buildings reinforced with viscous dampers increased by ۱۸% compared to structures without dampers. Additionally, the acceleration applied to structures with dampers was, on average, reduced by ۲۵%, which decreases the likelihood of structural damage under severe seismic loads. The use of viscous dampers is not only effective in reducing dynamic and structural responses but is also economically viable, as it reduces repair and maintenance costs and increases the lifespan of the structure. Overall, the findings of this study indicate that viscous dampers are an effective and practical option for retrofitting concrete buildings against earthquakes.

کلیدواژه ها:

Concrete building retrofitting ، viscous damper ، seismic loads ، applied moments ، structural stresses ، natural frequency