Time Response Study of Tall Chimneys,under the Effect of Soil Structure Interaction and Long Period Earthquake Impulse.

Abstract eng:
Time period is an important means of evaluating the structural response of the structure subjected to large scale earthquake vibrations. It is necessary to study the response of tall structures like chimneys at various points rather than evaluation of the structural system on a whole. Seismic design of structures is generally carried out assuming fixed base ignoring the flexibility of soil. But, it has been observed that flexibility of soil medium below the foundation decreases the overall stiffness of the structure resulting in a subsequent increase in natural periods of the system. In the present study a chimney 215m high is studied for its earthquake response for two cases 1) considering rigid base without soil effect 2) considering the effect of subsoil in foundation. The analysis is done using Time History analysis considering Bhuj Earthquake which is a long duration earthquake impulse. The main objective in using this earthquake was, to find out the effect on structure when hit by long duration and see how the response is modified, when soil effects are taken into the consideration. The analysis and results shows that the time period increases with increases with increase in soil flexibility. It remarkably increases up to 9% for soft soil in fundamental mode and up to 80-85% for higher modes.

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