International Journal of Emerging Technology and Advanced Engineering Website: www.ijetae.com (ISSN 2250-2459, ISO 9001:2008 Certified Journal, Volume 5, Issue 12, December 2015) 4. More the displacement flexible is the structure and vice versa. Therefore model type 3 is more stiff as compared to other models. 5. For G+7 building with diaphragm discontinuity modal mass participation is almost same for all models. Therefore diaphragm discontinuity does not have much effect on modal mass participation REFERENCES AND STANDARDS   Fig 16 Modal Mass Participation comparison for the six considered G+7 storey models in Y direction  It is observed that when considering modal mass participation in X direction, the participation is zero for all types in 1st and 2nd mode and in 3rd mode it is less in Type 3 when compared with other Types. On the other hand the modal mass participation is zero for all types in 2 nd and 3rd mode and it is almost same for all types in 1 st mode. Diaphragm discontinuity does not have much effect on modal mass participation.     V. CONCLUSION From the linear static analysis of G+7 storey building with plan irregularity following conclusions can be made 1. The behaviour of building is better when diaphragm discontinuity is closer to the centre of the building. 2. Frequency is directly proportional to the stiffness of building. Therefore model type 3 is more stiff than other model considered. 3. More the base shear stiff the building since member will attract more forces. Model type 3 is more stiff than other models considered   135 Indian Standard code IS 18932-2002 Turgut O. (2011) : â A study of the effect of slab gaps in buildings on seismic response according to three different codesâ (Scientific research and essays vol 6) Mohammed Y. and P.M Shimpale (2013) : âDynamic analysis of reinforced concrete building with plan irregularitiesâ (International journal of emerging technology and advanced engineering) Joheb A. and Syed A. (2014): â seismic vulnerability of RC building by considering plan irregularities using pushover analysisâ (International global journal for research analysis) Terry R., PE, SE : â Analysis of horizontally offset diaphragmsâ (World conference on timber engineering) Morteza M. and Behzad R. (2011) : âInvestigation of floor diaphragms flexibility in RC structures and code provisionsâ (Global association of research) Amin A. and Prof. P.S. Rao (2013) : âInfluence of torsional irregularities of RC buildings in High Seismic Zoneâ (Australian journal of basic and applied sciences) Ravikumar C.M and Sujith B V l (2012) : âEffect of irregular configurations on seismic vulnerability of RC buildingâ (Architecture Reasearch) R.G. Herrera and C.G. Soberon (2008) : âInfluence of plan irregularity of buildingsâ (14TH world conference of earthquake engineering.