ANALYSIS OF HIGH-RISE BUILDING WITH DIAGRID STRUCTURE SUBJECTED TO LATERAL LOADING

Abstract

The term "diagrid structure," which is short for "diagonal grid," refers to a particular kind of architectural structural system. It is distinguished by diagonal members that create a grid-like pattern on the building's façade (often in the form of diagonal beams or columns). Usually used in place of conventional vertical columns, these diagonal components produce a more open and attractive appearance. Around the world, there is a substantial increase in the construction of tall structures, and these buildings are affected by lateral loads due to wind or earthquake. There are several construction techniques available to withstand these lateral stresses. Among them, the diagrid structural system has gained popularity for tall buildings due to its unique geometric configuration, offering both structural efficiency and aesthetic appeal. Currently, the latest trend in diagrid structures involves using diagonal grids at specific angles around the building's perimeter and across its height in modules. Unlike traditional orthogonal structures, diagrids employ triangulated grids in place of vertical columns at the periphery, making them more efficient in providing stiffness against lateral loads. As a result, these systems are increasingly favoured for the design of tall buildings. In this work, we analyse a G+15-story RCC building with a regular floor plan of 30mx30m situated in seismic zones IV & V. With the objective to investigate a G+15 story, 10 models were made, of which 1 is a bare frame, 4 are diagrid angles that are analyzed in zone 4, and the same 5 models are analyzed in zone 5. We employ the Etabs 2020 software for structural simulation and analysis, considering wind loads based on IS 875 part 3 and seismic factors according to IS 1893(Part 1): 2002. Through a comparative assessment of the results from both the diagrid and conventional building analyses, we evaluate story displacement, story drift, base shear, and time period. This study provides insights into the performance of diagrid structures compared to traditional methods in the context of lateral load resistance and overall structural stability.