PARAMETRIC STUDY ON TORSIONAL EFFECTS OF IRREGULAR BUILDING WITH STIFFNESS AND MASS IRREGULARITY UNDER SEISMIC ZONE

Due to the expanding population all throughout the world, there is an enormous need for the construction of high-rise structures. One of the most crucial ways to prevent damage from future earthquakes is the construction of engineering structures that are earthquake- resistant. Earthquake forces are irregular forces that may or may not cause structural damage. Failure starts in the weakest area during an earthquake. This weakness might be brought on by the structure’s discontinuity in mass, stiffness, and shape. According to (IS: 18933, 2002), a story inside a building is considered to have mass irregularity only if its mass is greater than 200% of the story next to it. Average lateral stiffness or less than 70% of the stiffness in the level above. This paper presents the analysis conducted on the G+10 RC frame structure from zones II to V with mass and stiffness irregularities (response spectrum). The results show that the mass at the top floor was critical compared to other floors, whereas the stiffness at the ground floor was critical compared to other floors.