"A Study on Seismic behavior of Hexagrid type structural system"

Civil (Structural engineering)

There are a number of high-rise structures constructed all over the world and are being constructed. The analysis and design of high-rise structures is quite different from that of low rise structures because of lateral forces due to wind and earthquake. In high-rise structures the resistance to lateral loading (wind and earthquake loads) will be dominant criteria that have to be considered in the analysis and design and an efficient lateral load resisting system will define the efficiency of tall structures. In order to improve the efficiency of tube-type structures in tall buildings, a new structural system, called "Hexagrid", is introduced in this study. It consists of multiple hexagonal grids on the face of the building. In Hexagrid structural system almost all the conventional columns are eliminated. In this study an attempt has been made to study the Hexagrid structural patterns namely Horizontal hexagrid structural pattern and Vertical Hexagrid structural patterns under the seismic behavior & identify which structural pattern is efficient. The hexagrid resist both gravity & lateral load by the axial action of the diagonal members so, they simply act in tension or compression with no bending, depending upon the direction of the loading. A regular floor plan 36m x 36m is considered, all structural members are designed as per IS 456:2000. Earthquake parameters are considered from 1893-2002. Dead & live loads are considered as per Indian Standards. Here, analysis of hexagrid system will be conducted by using analysis & design software sap (2000). In this research, a set of structures using Hexagrid system having three various diagonal angles 40,50,60, degrees were designed based on plan configuration by computer program, for G+30, Story buildings for two different structural patterns namely horizontal hexagrid structural patterns & vertical hexagrid structural patterns. Finally, seismic behaviors of different hexagrid models based on hexagrid structural patterns is compared in terms of story drift, story displacement, time period, Distribution of load (Total gravity load & EQ as a lateral load), Base reactions, for static analysis & dynamic analysis in the form of response spectrum.

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