Diagrid Structural System for Tilted Steel Buildings

The rapid growth of urban population and the limitation of available land, taller structures are preferred for sustainability. When the height of the structure increases, the consideration of lateral load becomes critical and the lateral load resisting system becomes more important than the structural system that resists the gravitational loads. Diagrid structural system is widely used for tall buildings due to its structural efficiency and aesthetic potential provided by the unique geometric configuration of the system. In this paper, the impacts of variation of the angle of tilting on steel diagrid structures are presented. Modal and time history analysis of three, six and nine-storey buildings with a base dimension of 36 m × 36 m is performed using ETABS 2016. The results in terms of the time period, undamped natural frequency, maximum storey displacement, maximum storey drift, storey shear and overturning moment are compared. Tilted 3 storey diagrid building was found to have lateral stiffness very much similar to that of a prismatic diagrid. While the lateral stiffness of 6 storeys and 9 storey tilted buildings up to 2° was found to be similar to that of prismatic diagrid building.