ANALYSIS OF DIAGRID STRUCTURE IN COMPARISON WITH EXTERIOR BRACED FRAME STRUCTURE

Abstract

Over the last 10 years, diagrid structures have proven to be highly adaptable in structuring a wide range of building types, spans and forms. In most applications, diagrids provide structural support to buildings that are non rectilinear, adapting well to highly angular buildings and curved forms. The origin of the diagrid structural technology lies at the crossroads of engineering and architecture. The term “diagrid” have come from perimeter diagonals which have good structural efficiency and is gaining new interests in designing of tall structures because of its lattice like look. The term “diagrid” is a blending of the words “diagonal” and “grid” and refers to a structural system that gains its structural integrity through use of triangulation. In the diagrid structures, the vertical columns from the periphery are eliminated and this constructs the main difference between diagrids and exterior braced frames. Having triangulated configuration, the diagrids are able to carry the gravity and lateral loads. They also effectively minimize shear deformation as the diagonals carry the loads axially. The diagrid structural system is adopted these days for tall buildings because of its stiffness and flexibility in the architectural planning. This paper presents the study of 20storey diagrid structure in comparison with exterior braced frame structure.Analysis results and design of both the models are presented in terms of storey shear, displacement, drift and summary of lateral and gravity forces.