Abstract
The paper presents the limited study on the evaluation of the response of the dynamic soil structure interaction analysis of a two storeyed building frame resting on raft foundation using finite element method. The components of the building frame such as beams, columns and slabs along with the raft are modeled using 20 noded isoparametric continuum elements. The soil surrounding the foundation is modeled in the simplified manner using discrete independent springs. The interface of soil and raft has been accounted for by incorporating 16 node interface elements in the modeling. Further, the components of the superstructure and substructure are treated to behave in the linear elastic manner whereas the soil media is idealized to behave in the non-linear manner. The effect of raft thickness and soil modulus is evaluated on the dynamic response of the frame. The response is considered in terms of the frequency and amplitude. The result indicates that the dynamic loading and SSI has a considerable effect on the response of the structure.
Highlights
An analyst or a designer is mainly concerned with the analysis and design of a variety of structures
The corresponding percentage increase or decrease in amplitude and fundamental frequencies due to consideration of different raft thicknesses and soil modulus in the context of interactive analysis is indicated in the afore-mentioned table in brackets
Similar trend is observed in the frequency corresponding to maximum amplitudes
Summary
An analyst or a designer is mainly concerned with the analysis and design of a variety of structures. In foundation design, analyses of actual settlements are based upon a flexible loading pattern with no assessment of the effect of the stiffness of the structure on the patterns and magnitudes of foundation settlements This procedure of neglecting the coupling or interaction between soil and structure tends to simplify the mathematical analysis of the problem, it is, an oversimplification of reality. Two important characteristics that distinguish the dynamic soil- structure interaction system from other general dynamic structural systems are the unbounded nature and the non-linearity of the soil media Another effect which is taken into account concerns the interaction of the structure with the foundation, which provides both a more realistic boundary condition as well as damping model due to radiation effect. Of the three widely used methods of SSI analysis, viz. (i) Elimination Method, (ii) Sub-structure Method and (iii) Direct Method, the direct method has become more attractive to researchers and engineers because it can consider the non-linearity of the unbounded soil as long as sufficiently accurate transmitting boundaries can be developed
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