Analysis and Design of Diagrid Buildings

The raising level of migration of people to urban cities and unavailability of land to accommodate this migration have given birth to multi-storey buildings or tall buildings. Currently, numerous systems comprising beams with columns, shear walls or bracings either individually or in combinations are used for designing structures of tall buildings. From them diagrid system is one of new trends. Diagrid system is adopted due to architectural limitations of providing vertical elements, as in this system only diagonal members in form of grids are provided to support both gravity as well as lateral loads. In present study, behavioural investigation of different diagrid buildings is assessed using ETABS software. Three RCC buildings 6, 12 and 18 storied are considered for this study. The objective of the study is to compare the conventional frame (CF) system with diagrid (DG) system with respect to varying number of storeys. To elaborate the comparison, diagrid system is further divided into three types as per diagrid angles, i.e. 33.42°, 52.85° and 63.2°. From comparison of results, it is concluded that, for 6-storey buildings adopting CF system reduces construction cost and time, for 12-storey buildings any system except 33.42°DG system can be adopted as per construction cost, time and aesthetical appearance and for 18-storey buildings 63.2°DG system is preferred. Hence, diagrid structural system can be adopted for buildings above 40 m height approximately.