Seismic Retrofitting Strategies for Soft-Ground-Storied Building
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Seismic Retrofitting Strategies for Soft-Ground-Storied Building Johneo Pasi1
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Avik Samanta1
Received: 17 September 2018 / Accepted: 3 September 2020 The Institution of Engineers (India) 2020
Abstract During seismic events, high-rise buildings with soft ground storey are vulnerable to damage as there is a sudden change of stiffness along its height. In this study, different types of energy dissipation devices, which include lower toggle bracing, double-bracing fluid viscous damper, single-bracing fluid viscous damper and single-bracing friction damper, and traditional infill wall are implemented in a 12 storied soft-storey building to assess their influences on reduction of building’s responses during seismic events. These retrofitted buildings are analysed bi-directionally with various ground motion time history of Kolkata region, India. It is seen that energy dissipation devices proved to be better than traditional infill wall due to the fact that the devices enhance the damping capacity as well as stiffness strengthening to the building while traditional infill wall enhances only stiffness strengthening to the building. Keywords Soft storey High-rise building Energy dissipation devices Fluid viscous damper Friction damper Infill wall Retrofitting Scaling
Introduction In the urban areas throughout the world, multi-storied buildings have been constructed abundantly keeping the ground storey open. Such opening has been often kept for using the ground floor as parking and social gathering. & Johneo Pasi [email protected] Avik Samanta [email protected] 1
Indian Institute of Technology Patna, Patna, India
Performances of such building have been very poor in past earthquake [10, 16]. The soft-ground-storied buildings are vulnerable to damage during seismic events due to the fact that their ground storeys have major weak points which cause the lateral force to concentrated more than in any other parts of the buildings. This issue is due to the sudden change of stiffness along the height of these buildings, leading to sudden alteration of transmission of force in the building. The bare frame resists the loads through frame action only while in case of a soft-ground-storey frame; its upper storeys resist the applied lateral loads both through frame action as well as through infill walls while its ground storey resists the loads only through frame action. This sudden alteration of transmission of force in the structure leads to the creation of soft storey mechanism in the building. Many researchers have proposed and implemented various strategies in improving the seismic performance of the structures. There have been many proposals on the improvement of the performances of these soft-storey buildings during seismic events by increasing the stiffness, strength, and ductility of its structural elements. These strategies generally are classified into two categories: local strategies and global strategies [26]. These local strategies allow one or more under-strength eleme
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