Seismic evaluation of braced and diagrid structures

Abstract

Now a days Day by day the construction of tall building increases, hence for tall buildings safe analysis and construction should be carried out, and as the height of the structures increases, the Lateral load resistance system becomes very important as the structural resistance system that withstands gravity loads. The widely used internal lateral load resisting structural systems include rigid frame, braced frame, shear wall and outrigger structure whereas the exterior systems constitute tubular, diagrid, pentagrid, hexagrid and octagrid structures. The Diagrid structure is more economical and suitable for high-rise buildings compared to conventional buildings. A constructed system called the Braced Frame was created to withstand the effects of wind and earthquake forces. It is forbidden for members of a braced frame to swing laterally. In This papers the work is done to know the behavior of seismic forces on bare frame, braced frame and diagrid with varying different angles with symmetric plan of 24x24m. An G+15 storey is investigated in which 6 models are prepared out of which one is bare frame, one is braced frame and rest of 4 models are diagrid angles. The equivalent static and time history analysis method are carried out in terms of displacement, storey drift ratio, base shear and time period using ETABS 2020 software. Then comparative study is carried in between bare frame, braced frame and diagrid structure with different angle variations and results are presented. After observation it was found that the diagrid models performing better resistance against the seismic force in terms of all parameters compare to bare and braced frame structure.