Abstract
Previous earthquakes have shown that structural damage depends not only on the behavior of the structure, but also on the foundation and subsoil below. The behaviour of pile foundations under seismic load is a very important factor affecting the performance of the structure. The primary aim of the research is to study the effect of the dynamic soil-pile-structure interaction on the response of a five-storey scaled-down model structure by conducting laboratory Shake table tests. The response of the model structure was investigated for both fixed base condition and supported by model piles embedded in soft clay. A rigid soil container with absorbing boundaries was used in the study along with a synthetic clay mix. The structural system was subjected to harmonic loading at different frequencies. From the experimental measurements, it can be observed that the soil pile structure system amplifies the lateral deflections and the storey drift of the superstructure in comparison with the fixed base structure. Building frames with varying height and lateral dimension were analysed numerically for both fixed and SSI with pile foundation in order to assess the effect of building configuration for the seismic response. The interaction of the soil pile structure system increases the lateral response of the structure. As the height of the structure increases, the amplification of response in SSI condition also increases, which can change the performance level of the structure, and hence Soil Pile Structure Interaction plays a significant role in the aseismic design of the structure.
Highlights
In the analysis of civil engineering structures, the super structure is usually analysed by treating it as independent from foundation and soil by providing fixity at the base on the assumption that no interaction takes place
Similar experiments were conducted on the Soil pile structure system
An effort has been made to investigate the effect of soil pile structure system on its seismic behaviour
Summary
In the analysis of civil engineering structures, the super structure is usually analysed by treating it as independent from foundation and soil by providing fixity at the base on the assumption that no interaction takes place. The main purpose of the foundation is to safely transfer the loads on to the soil due to which the state of stress in soil is greatly altered which will intern affect the response of the structure. It becomes imperative to consider soil foundation and structure as components of a single system for analysis and design. It is evident from the past earthquakes that the damage to the structure depends on the behaviour of the super structure and on the foundation and sub-soil below it. Many researchers have studied the behaviour of the soil-pile-structure system subjected to dynamic loading. The behaviour of pile foundations under Seismic loading is a very important factor affecting the performance of the superstructure. Piles in firm soils have generally performed well during past earthquakes, while piles in soft and liquefiable soils have been a cause of major concern
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