International Journal of Advanced Innovative Technology in Engineering (IJAITE)

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Effects Of Staircase On Seismic Performance Of Rc Multi-Storied Frame Buildings For Zone Iii & Zone Iv

PRAFUL R. MOWALE, LAXMIKANT TIBUDE

Abstract :

This paper deals with the effects of staircase during the seismic performance of Multistoried RC Frame Building in zone III & zone IV at various location with or without staircase in plans have been studied. During earthquake as we construct the structure with staircase monolithically, staircase also contributes its performance of the building, due to this structural discontinuity, performance of buildings may result in non-linear behavior. Because of this non-linear behavior, modification in various seismic parameters such as a reduction in the time period, displacement, time period and story drift of the building is essential. Due to the rigidity of inclined slab and of short columns around staircase, beams and columns are often characterized by a high seismic demand. It can be concluded that the effect of a staircase in the analysis and design of RC frame buildings cannot be ignored. In the present study, the effect of staircase position on RC frame structures has been carried out by adopting various location of building models with and without staircase along with or without shear wall in longitudinal and transverse direction. Shear wall is used for lift duct in RC multistoried model. The Linear Response Spectrum analysis of the models has been carried out as per IS: 1893 (Part 1) - 2002 and IS: 456 – 2000 with the help of Etab 15.1 software. The Seismic characteristics in terms of Story Drift, Story Displacement and Time period, have been compared with the seismic characteristics of models with and without a staircase along with or without shear wall. Further, the effect of change in location of the staircase on the behavior of the building has also been observed. The identification of the weakest elements of the structure, the failure type considering the presence of the stairs, and their contribution in the nonlinear performance of RC frame buildings are some of the areas on which the present paper has presented. In addition to these, short column effect, variation in moments of beams and columns that are attached to staircase slab, failure and deformation in staircase models have also been studied.

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