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|Title:||Seismic field methods for in situ moduli|
|Authors:||Ballard, Robert F.|
McLean, Francis G.
|Keywords:||Earthquake resistant structures|
Finite element method
|Publisher:||Soils and Pavements Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
Abstract: The design and evaluation of the response of engineered structures to earthquake excitation have increased the current use of seismic field studies to determine soil properties at low strain levels for in situ materials. Buildings, nuclear power plants, major earth structures, locks, and concrete dams are now being studied using finite element techniques and modal or time-step analyses. The validity of these studies and the interpretation of their results depend on a reliable assessment of input values for in situ foundation properties. This report presents procedures for planning seismic field investigations for the determination of soil properties. Emphasis is placed on the selection of appropriate seismic techniques to obtain sufficient redundant data with which to establish internal consistency for reliable assessments of determined properties. A summary of various available methods, as well as recent innovations in equipment and procedures, is presented. Comparisons of data derived from different types of tests are shown, and case histories are presented. Interpretive techniques are reviewed, with special attention to those factors which influence the reliable determination of soil moduli.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Miscellaneous Paper|
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|MP-S-75-10.pdf||4.98 MB||Adobe PDF|