Seismic Analysis And Design Of Multi-Storey Rc Building With Viscous Dampers Using Etabs

Abstract

Earthquakes are among the most destructive natural hazards, causing significant damage to structures, especially multi-storey reinforced concrete (RC) buildings. In seismic regions, buildings are subjected to lateral dynamic forces that induce vibrations, leading to structural distress or failure if not properly designed. Conventional seismic design, as per IS 1893 (Part 1): 2016, mainly rely on increasing the strength and stiffness of structural elements. However, this approach can result in uneconomical designs and may not effectively control structural response such as excessive displacement and drift. To address these challenges, modern techniques involve the use of energy dissipation devices like viscous dampers, which helps in reducing seismic effects by absorbing a portion of the input energy. This study aims to evaluate the effectiveness of viscous dampers in improving the seismic performance of multi-storey RC buildings. A multi-storey RC building is modeled and analyzed in ETABS as per IS 1893 (Part 1): 2016 provisions. The analysis is carried out using response spectrum method. Initially, the building is analyzed without dampers to determine parameters such as storey displacement, storey drift, base shear, and member forces. Later, viscous dampers are introduced at suitable locations in the structure. The building is re-analyzed, and the results are compared with the conventional model. The effectiveness of dampers are evaluated based on reduction in displacement, drift, and forces in structural members. The study concludes that the incorporation of viscous dampers significantly enhances the seismic performance of the building. There is a notable reduction in storey displacement and inter-storey drift, indicating improved structural stability and safety. Additionally, the forces in structural members are reduced, leading to more economical and efficient design. Hence, viscous dampers prove to be an effective solution for controlling seismic effects in multi-storey RC buildings and can be widely adopted in earthquake-resistant design practices.