SEISMIC RESPONSE OF SOFT STOREY BUILDINGS WITH SHEAR WALLS

1.                Vertical stiffness irregularity increases the fundamental time period, displacement, and storey drift. 2.                Both-corner solid shear walls provide the most effective and consistent seismic performance for both L- and C-shaped buildings. L-shaped buildings are more vulnerable to displacement and torsional effects than C-shaped buildings due to their irregular geometry. 3.                Both-corner shear walls significantly reduce displacement: L-shape: 16.03 -13.17 mm (17.84% reduction) C-shape: 13.80 -12.52 mm (9.27% reduction) 4.                Soft-storey conditions increase structural flexibility and displacement, while both-corner shear walls effectively control these effects. 5.                For alternate soft-storey L-shape, displacement reduced from 17.21-13.43 mm, showing approximately 21.96% improvement. 6.                Adjacent and one-corner wall arrangements are less effective because they create unbalanced stiffness and greater torsional effects. Both-corner walls increase structural stiffness significantly and reduce the fundamental time period. 7.                All models satisfy the IS 1893:2016 drift limit, but both-corner configurations provide the lowest drift values.  Wall openings cause only a slight reduction in performance compared with solid walls and remain effective when properly designed. 8.                Higher stiffness increases base shear, creating greater force demand on shear walls and foundations. Four-direction response-spectrum analysis is important, as RS45 and RS135 govern several irregular models. Overall, balanced perimeter/corner shear wall placement is the most effective strategy for controlling displacement, drift, torsion, and soft-storey effects in irregular buildings.

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