IJSR - International Journal of Scientific Research

C. Sumitha; C. Ravi Kumar Reddy; M. Satish Kumar

Volume : VII, Issue : VII, July - 2018

SOIL INTERACTION OF BUILDING FRAME RESTING ON DENSE SAND: EFFECT OF CHANGE OF BAY LANGTH

C. Sumitha, C. Ravi Kumar Reddy, M. Satish Kumar

Abstract :

The common practice of obtaining foundation loads from the structural analysis without allowance for foundation settlement may, therefore, result in extra cost that might have been avoided had the effect of soil–structure interaction been taken into account in determining the settlements. This requires that the engineers not only understand the properties of the ground but they also need to know how the building responds to deformation and what the consequences of such deformation will be to the function of the building. This paper presents the analysis of the single bay single storied building frame resting on dense sand. The numerical analysis is carried out using ANSYS by assuming that the base of the frame is resting on dense sand when the length of the bay of the frame changes from 3m to 10m. The conventional analysis which assumes that the frame is resting on rigid support is carried out using STAAD by assuming the fixed base for the columns in the building frame when the bay length changes from 3m to 10m. From the numerical study, it is found that the The shear force value in the column from conventional method less than that of the value from finite element analysis. The percentage difference in shear force is 25.27%. The axial load values in the column and shear force values in the beam for various bay lengths of the frame obtained from both conventional and finite element analysis are not having considerable difference. The maximum percentage difference in values of bending moment in the column and beam from conventional and finite element analysis is 69.34%, 23.03% respectively. The conventional method of analysis is predicting higher values of bending moment in the column when compared to the finite element analysis which considers soil interaction. Hence neglecting soil interaction is uneconomical. The conventional method assumes that the footing rests on a rigid medium hence footing settlements are ZERO. But in reality the footings undergo some settlement. Hence the settlement values obtained from the finite element analysis will help the designer to satisfy the codal requirements on footing settlements.