Seismic Analysis of Lateral systems In Tall Buildings for Different Soil Type and Seismic Zones

Buildings are subjected to different earthquake loading and behaves differently with diversification in the types of soil condition, such as dense soil, medium and soft soil. Different soil properties can affect seismic waves as they pass through a soil layer. When a structure is subjected to an earthquake excitation, it interacts with the foundation and soil, and thus changes the motion of the ground. It means that the movement of the whole ground structure system is influenced by type of soil as well as zone by the type of structure. As the seismic waves transfer from the ground which consist of alteration in soil properties and performs differently according to soil’s respective properties. Efficient lateral systems, decreases the lateral deformations caused by the seismic forces in the buildings. In this work, it is proposed to carry out an analytical study, on multistory buildings of 15 stories, was carried out accounting for different seismic zones and soil types. The suitability and efficiency of different lateral bracing systems that are commonly used and also that of concrete in fills are investigated. The different bracing systems viz., X-brace, V-brace, inverted V or Chevron brace, Outriggers and in fills, are introduced in the buildings through analytical models. These were analyzed in 45m height, using ETABS software, for the action of lateral forces employing linear static and linear dynamic methods as per IS 1893 (Part I): 2002. The results of the analyses, in terms of lateral deformations and Base shears, Displacement, Drift, storey shear were obtained for all the different conditions discussed above The suitability of the types of lateral system for the buildings is suggested based on the soil type in particular zone.