Effect of Soil Flexibility on Analysis and Design of Building
Journal Title: International Journal of engineering Research and Applications - Year 2017, Vol 7, Issue 6
Abstract
Generally in the analysis and design of multi-story building frame it is assumed that the base is fixed but in actual the structure is ultimately supported on soil which is flexible in nature. This flexibility of soil may vary due to load-settlement characteristics of soil, variation in soil strata below the foundation level, seasonal variation of soil property etc. The flexible nature of soil causes differential settlement between foundations on application of loads which in turn redistribute the structural forces as well as design. The present paper attempts to acknowledge the effect of soil flexibility in analysis and design of structure. A G+7 4-bay by 4-bay RCC residential building frame supported on sandy soil and situated in seismic zone V as per IS: 1893(part 1)-2002 is analysed usingStaad pro software. Initially the building frame is modelled and analysed assuming fixed base and support reactions are determined for different load cases. The foundation sizes for different supports are calculated by using Staad foundation software. The fixed support is replaced by a spring of equivalent foundation stiffness to perform flexible base analysis. In flexible support analysis the maximum total settlement and differential settlement between footings is found to be 44.19 mm and 8.14 mm respectively which is neglected in conventional analysis. The variation in values of settlement is more critical in case of seismic loading. Soil flexibility causes significant variation in values of support moment compared to vertical support reaction. The flexibility of soil also affects the forces in beams and columns. The requirement of steel reinforcement is reduced by nearly 7% in flexible support system compared to fixed base. The study shows that the soil flexibility redistributed the structural forces and affects the analysis and design of structure. In present study analysis and design of structure assuming flexible base is found to be more accurate and economical.
Authors and Affiliations
Gagan Malviya, Vivek Garg
Keywords
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- EP ID EP391401
- DOI 10.9790/9622-0706017178.
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