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P-DELTA ANALYSIS OF MULTI-STORY BUILDING USING ETABS SOFTWARE

Chandana P1, Dr.D.S.Sandeep Kumar2

1M.Tech student, 2 Assistant Professor , Department of Civil Engineering PES College of Engineering, Mandya, Karnataka, India.

ABSTRACT
Now a day’s tall structures have gained popularity because of urbanization and population increase and land cost being higher day by day. A tall structure should be designed to resist the lateral load like Earthquake force within the permissible limits set by Standards. For tall structure it is necessary to consider nonlinearity, which is generally observed in geometry & materials. Our study is based on “P-Delta” analysis which incorporates geometric nonlinearity in the analysis. The study will be performed on structural software ETABS. P-delta effect is a secondary effect on structure, also known as ‘Geometric nonlinearity effect’. With increase in number of stories, P-Delta effect becomes more important. If the variation within bending moments and displacements is more than 10%, P-delta effect should be considered in design. In this study of multi storey building is studied and both, linear static analysis (without P- delta effect) and second order analysis (with P-delta effect) on multi storey building have been carried out. A building model with constant height (G+24) storeys with and without shear walls is prepared, and in each case linear static (first order) and P-delta (second order) analysis is carried out for gravity and earthquake loads. The maximum response in the building in terms of displacement, drift ratio, moment and shear forces has been found out and compared. The analysis of multistoried RC building have been done using ETABS 2016 structural analysis software.

Keywords: Linear Elastic and Non-linear Elastic Analysis, P-Delta Effects, Geometric Non-linearity, Displacement, Drift, Base shear.