Seismic Behaviour of Gfrg-Ogs Building System - a Computational Study

Abstract eng:
Glass Fibre Reinforced Gypsum, abbreviated as GFRG, is a light-weight load-bearing building panel, manufactured using gypsum plaster, glass fibre rovings and other special additives. In GFRG construction, the design demands all the walls to start from the foundation itself. The current demand from the housing sector for the urban community in India is open ground storey GFRG building (GFRG-OGS) in order to have parking space for vehicles at the ground or basement storey of the building. For this vertically irregular structure, columns can potentially collapse by soft storey mechanism with the formation of plastic hinges under the action of seismic forces. This paper analyses the performance of such building systems under gravity and lateral loads. The load path and the behaviour of the structure was studied by carrying out finite element analysis. The gravity loads were found to get transferred to columns by arching mechanism through walls. Lateral pushover analysis of the system revealed very less force demand on the beams. The hinges were in the elastic range owing to the higher number of columns given to utilize the arching mechanism for the Design Basis Earthquake (DBE) whereas for the Maximum Considered Earthquake (MCE), hinges went to the life safety level. The behaviour of the system was also verified by non-linear time history analysis incorporating material and geometric nonlinearities in the system and for seven different earthquake acceleration data. Based on this, a pushover load pattern different from the codal equivalent static load pattern was proposed for the analysis. The drift of the structure was found to be within the permissible limit. Hence the system behaviour is basically dictated in terms of strength based limit state. The results from the computational studies will be verified experimentally.

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