Dynamic Analysis Of Mass-irregular Rc Buildings Subjected To Earthquake Loads

Abstract

This Thesis Investigates The Impact Of Mass Irregularity On The Seismic Performance Of A Reinforced Concrete (RC) Framed Building. Mass Irregularity Occurs When The Seismic Weight Of A Storey Exceeds 200% Of That Of An Adjacent Storey, As Per IS 1893 (Part 1): 2002. A Four-storey RC Building Model Was Analyzed Using STAAD PRO Software, With Mass Ratios Increased From 1.0 To 4.0 In Increments Of 0.5 For Each Storey. Key Parameters Evaluated Include Frequency, Time Period, Spectral Acceleration, Base Shear, Storey Shear, Storey Drift, And Mass Participation Factors. Results Indicate That Mass Irregularity Significantly Affects Dynamic Properties, With Maximum Impacts Observed When Irregularity Is At The Top Storey For Frequency And Drift, And At Lower Storeys For Shear Forces. The Study Highlights The Need For Careful Consideration Of Mass Distribution In Seismic Design To Ensure Structural Integrity.

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