Abstracto

EFFECT OF SOIL-FLEXIBILITY ON LATERAL NATURAL PERIOD IN RC FRAMED BUILDINGS WITH SHEAR WALL

Jayalekshmi B.R , Chinmayi H.K

Shear walls are the typically used lateral load resisting systems having very high in-plane stiffness and strength which resist large horizontal loads. Flexibility of soil medium underneath the foundation diminishes the overall stiffness of a building resulting in a consequent increase in the natural periods of the system which further leads in the change of seismic lateral response of the structure. The effectiveness of shear walls in resisting lateral forces when placed at different locations in buildings incorporating the flexibility of soil is less discussed in any literature. Hence in the present study, an attempt has been made to find the effectiveness of shear wall locations on RC frame buildings of varying height with raft foundation by noting the effect of soil flexibility on change in lateral natural period. Free vibration analysis of the three dimensional models of these buildings with five different shear wall positions founded on different soils has been carried out using finite element software. And the best location for the least spectral acceleration in the structure is identified