The IUP Journal of Structural Engineering
Seismic Response of Shear Wall Buildings with Rigid and Flexible Foundations

Article Details
Pub. Date : Jan, 2020
Product Name : The IUP Journal of Structural Engineering
Product Type : Article
Product Code : IJSE20120
Author Name : Shradha Patil, Kiran Koraddi
Availability : YES
Subject/Domain : Science and Technology
Download Format : PDF Format
No. of Pages : 13

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Abstract

The significance of incorporating Soil Structure Interaction (SSI) effect in the analysis and design of RC framed structure is increasingly recognized but still has not penetrated to the large level owing to various complexities involved. It is a well-established fact that the SSI effect considerably influences the design of high-rise storey buildings subjected to lateral seismic loads. The shear walls are often provided in such structure to increase the lateral stability to resist seismic lateral loads. The paper presents a linear soil structure analysis of a G + 15 storey RC shear wall building frame resting on isolated footing and raft foundations and supported by deformable soil. The modeling and analysis is carried out using ETABS 2015 software under gravity loads and seismic loads. The interaction work analysis is carried out with and without shear wall to study the effect of inclusion of shear wall on the forces in the footing due to settlement of soil mass. Both the frame and soil mass are considered to behave in a linear elastic manner. It is observed that the SSI effect significantly alters the time period, base shear, stiffness, storey drift and storey forces of the building due to soil settlement. The non-interaction analysis of space frame shear wall suggests that the presence of shear wall significantly reduces time period and displacement of the building but the interaction effect causes restoration of time period and displacement to a great extent.


Description

Most of the civil engineering structures involve different varieties of structural components with direct contact with ground. When external forces such as earthquake act on these structures, neither the structural displacements nor the ground displacements are independent of each other. This process in which the response of the soil influences the motion of the structure and also the motion of structure influences the response of the soil is termed as Soil Structure Interaction (SSI) (Jenifer et al., 2012). At present, SSI is the most flourishing area of research in the field of structural engineering. Normally, the structural analysis of an RC space edge is completed assuming base of building frame to be fixed and by ignoring the impact of soil flexibility. Waves from an earthquake reach a structure, produce the motion in structure and these motions depend on structural vibration characteristics and its layout. SSI has been perceived as a vital parameter that may altogether influence the movement of base, relative building reaction and movement of soil. In any case, building frames dependably rest on deformable soil bringing about redistribution in strengths and moment because of SSI impact caused by the reaction of the superstructure, as well as by the reaction of the subsoil underneath. Accordingly, convention examination is unrealistic and might be unsafe. Applying SSI impacts empowers the structural designer to assess and evaluate the realistic performance of soil structure system under seismic motion. It is observed that the SSI impact is more pronounced if there is an occurrence of high storied structures laying on soft soil and may turn out to be additionally irritated when such structures are subjected to seismic impact.


Keywords

Shear wall, Soil Structure Interaction (SSI), Base shear, Fixed base, Flexible base, Storey drift, Natural period, Storey force, Storey stiffness

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