Influence of Characteristics of Ground Motions on the Behaviour of Diagrid Buildings

Abstract

The diagrid structural system, employed in constructing buildings and roofs, can be characterised as diagonal members built as a framework produced by joining various materials such as metals, concrete, or wooden beams. Today's high-rise constructions and large-span structures typically employ diagrid, particularly for complex geometries and curved shapes. Triangles have a natural tendency to remain stable, as has been known since the earliest days. There is still much research being done in this area to get the finest results with improved performance and dependability despite its recent rise in popularity. As a result, experts have utilised them frequently and are well-liked by engineers and architects. Concrete-Filled Steel Tubular (CFST) diagrids can rectify the main disadvantage of diagrid structures over conventional buildings as they are less brittle and more ductile. The poured concrete effectively keeps the steel tube in the CFST from buckling inward. The steel tube causes a tri-axial state of stress in the concrete, which improves the concrete's compressive strength. The steel tube also serves as longitudinal and lateral reinforcement for the concrete core. This paper aims to study the behaviour of CFST diagrid buildings of different heights subjected to earthquake ground motions. The focus is to investigate the influence of ground motion characteristics on the behaviour of steel diagrid buildings and CFST diagrid buildings when subjected to ground motions of varied classes. The response parameter considered is top-storey displacement.