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PERFORMANCE ASSESSMENT OF BUILDINGS DESIGNED WITH SSI AND WITHOUT SSIAuthor: e.keerthana Date: 2020-10-15 Report no: IIIT/TH/2020/90 Advisor:Pradeep Kumar Ramancharla AbstractSoil act as supporting medium for buildings as loads from the buildings transfer to soil. Ability of soil to resist these loads depends on type of building and on type of soil. Existing soil tests and geotechnical investigations in practice according to code show the behavior of soil based on only type of soil and discuss results before construction of building. Behavior of soil under the action of these building loads requires attention. This study initiated to considered magnitude of load based on height of buildings and type of soil based on IS 1893 (Part-1)-2016. From earlier studies this study categorized geotechnical investigations based on each low, medium and highrise structures founded on hard, medium and soft soils respectively. Combined behavior of soil and sub-structure of building plays an important role in building safety. Soil-structure interaction (SSI) is important phenomenon which consider soil and substructure behavior together. In past case studies SSI in many of structures studied only under seismic events where behavior of soil becomes complex. It is seen that respective seismic design of these building according to IS code is not sufficient for building safety as type of soil is not considered to required extent in building design. Not only in seismic design even in general design of buildings type of soil is ignored and base of building is assumed to be fixed. This study compare fixed base and flexible base by considering low, medium and high-rise buildings founded on hard, medium and soft soils designed for IS 1893 (Part-1)-2016, fixed base and flexible base respectively. This study considered low (5-storey), medium (10-storey) and high-rise (20-storey) buildings founded on different type of soils according to IS code as hard, medium and soft soils. These 9 buildings designed for base shear obtained from IS 1893 (Part-1)-2016, fixed base and flexible base respectively show that buildings are over designed when compare with flexible base. In hard soil, building designed for IS Code is 11%, 21%, 33% overdesigned than flexible base building, in medium soil it is 9%, 21%, 33% overdesigned and in soft soil it is 25%, 45%, 59% overdesigned in all low, medium and high-rise buildings respectively. Buildings with overdesign are assumed to be safe, to check the safety of these overdesigned buildings linear dynamic analysis and pushover analysis were performed, from these analysis it is proved that flexible base design is safe and economic than IS code and fixed base design except for high-rise buildings on soft soil. For these high-rise buildings soil improvement techniques are suggested as mentioned in Appendix B. Full thesis: pdf Centre for Others |
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