Estimation of fundamental period for structures supported on pile foundations |
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| Authors: | Sanjeev Kumar Shamsher Prakash |
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| Institution: | (1) Southern Illinois University - Carbondale, Carbondale, IL, 62901;(2) University of Missouri-Rolla, Rolla, MO, 65401, U.S.A |
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| Abstract: | One of the significant effects of considering soil-structure interaction in the analysis of structures is the increase in
the fundamental natural period compared to the fundamental natural period of a similar structure, fixed at the base. Applied
Technology Council (ATC) originally set forth some provisions to calculate the fundamental natural period of flexible based
structures using the period of a similar structure, fixed at the base, and lateral and rocking stiffness coefficients of the
foundation. These provisions became the basis of current soil-structure interaction recommendations in several building codes.
The fundamental natural periods of structures founded on different types of foundations computed using recommendations of
the ATC are compared with those computed using a simplified model to perform soil-structure interaction of shear-type structures.
Results show that the provisions given in ATC may be used for structures supported on shallow footings but may not be applicable
for structures supported on pile foundations or foundations having the ratio of lateral to rotational stiffness coefficients
different from those of shallow foundations. An equation, similar to the equation recommended by ATC, is presented to estimate
the fundamental natural period of structures supported on pile foundations.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | dynamic period pile foundations soil-structure interaction |
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