Author : Meghna 1
Date of Publication :13th June 2019
Abstract: Many structural systems are available for constructing stable tall buildings. The diagrid structural system has proved to be better performing due to its structural efficiency and aesthetic potential. As the name depicts ‘Diagrid’ refers to diagonalized grid arrangement of members mainly on periphery of the structure. It basically works on the principle of triangulation as a result of which the diagonal members have the ability to carry both gravity as well as lateral loads effectively. The main objective of this research is to analyse the seismic performance of diagrid building in order to find out its feasibility for high rise constructions. In this study structural analysis of 48-storey steel diagrid building with 4-storey module of diagonal member for both square and circular plan was done to evaluate their performance. The plan considered for study was 36m x 36m and the method used for analysis was Response Spectrum Method. All the members were designed as per IS456:2000 and IS1893(Part I):2016.The modelling and analysis were done by using ETABS 2017 software. The performance of both square and circular diagrid modelwas evaluated and compared from various seismic parameters i.e. time period, base shear, storey displacement, storey drift and storey stiffness. The results obtained were expressed in the form of graphs and the values were compared with the limitations as per codes.It was founded that storey displacement and storey drift lies within the permissible values as per IS1893(Part I):2016 and EU-8(2004). Comparing the specified parameters, it was observed that circular diagrid model performs better than the square diagrid model. It was observed that diagrid structural system is found to be effective for high-rise structures due to their high stiffness and aesthetic potential. Overall it was concluded that the diagrid building can be considered as sustainable solution in terms of resources and production of waste.
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