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COMPARISON BETWEEN FORCE BASED SEISMIC DESIGN AND DISPLACEMENT BASED SEISMIC DESIGN OF TALL RC STRUCTURES
Author Name

Tank Raj M, Priyanka Dubey and Ashwin Hardiya

Abstract

Most of forced based seismic (FBD) design codes are intended to provide design and analysis such that, structure will resist small earthquakes without damage, moderate earthquake without major structural damage, severe earthquake without collapse. These current provisions attempt to achieve all three performance objective by specifying only one design earthquake level. The Force Based Design (FBD) include the determination of the required strength based on estimated stiffnesses which in fact depend on the final allocated strength. In the force-based codal method of design, the base shear is computed based on perceived seismic hazard level, importance of the building and the appropriate force reduction factor. The emphasis is made on that, the structure should able to resist design base shear. Performance based design methods are viable alternative for seismic design and are emerging as latest tool in which, the design is done for an intended displacement or, an intended performance under a perceived hazard level. A displacement-based design of buildings for seismic forces is better able to meet the desired performance criteria than a force-based design. Direct Displacement-Based Design (DDBD) was firstly proposed by M.J.N. Priebstley (1993). The theoretical formulation of DDBD is done confirming to IS code provisions. Illustrative problem for R.C. buildings of 16, 20 and 25 storey building with varying bay side are considered for study. Base shear and lateral load distribution are obtained as per FBD and DDBD. The performance evaluation of frames designed by FBD & DDBD s done using Static Push- over Analysis and Non-Linear Time History Analysis in Seismostruct. The P-M and M-ϕ non-linear parameters are considered as per Indian Standards.The parameters like Base Shear, Lateral Load Distribution, Reinforcements in Structural Members, Interstorey Drift Ratio and Displacement Profile of the Structure are compared for DDBD and FBD. The work carried out determines that displacement-based design is suitable for low-rise to mid-rise buildings. However, for tall structures, the applicability of displacement-based method is questionable..



Published On :
2023-01-21

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