Parametric Study on Seismic Response Control of Tall Building Installed with Friction Dampers

Tall buildings are essential for the vertical growth in urban areas due to lack of available land, allowing efficient and pleasant land use and accommodating increasing populations density. Tall building should withstand lateral forces from wind and seismic activity to ensure the stability and occupant safety. Advanced protection techniques, active, semi-active and passive control being used to ensure resilience against seismic events. This study evaluates the effectiveness of friction damper by varying key parameters such as applied normal forces to determine slip load. By systematically selecting theses variables, the study aims to understand their influence on the various response parameters such as top storey displacement and acceleration counterpart, inter storey drift, storey displacements, base shear and damper’s energy dissipation capacity to determine overall effectiveness in seismic response control. For the study, a 25-storey tall reinforced concrete building is 3D modeled and designed in ETABS to analyses uncontrolled seismic responses under the real earthquake ground motion. Then the controlled responses are derived using numerical simulation in MATLAB using state space method. The uncontrolled responses of ETABS and MATLAB is matched. The controlled response parameters are derived on optimized value of normal force derived from the range values of normal forces and coefficient of friction. The controllability index (R_{e }) is introduced to determine the effectiveness of friction dampers installed at all storey with optimized value of normal forces. The study concludes that optimized, rather than maximized, values of normal force critical to achieving balanced seismic performance in tall building.