時代の要請に応える土の繰返しせん断変形特性試験の確立を(<特集>地震時応答解析と耐震性評価)

概要

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A need for research on the test method of cyclic shear deformation characteristics meeting the demands of the times is presented. Following the brief review on the development of the conventional method, the limitation of the conventional method is shown to be up to 0.1% strain or a little larger with several evidences. This strain range is much smaller than required at present because very large earthquake motion is used in the design. At the same time, method for processing the test data is discussed and is shown not to be relevant when considering the large strain. Then, shortages in the constitutive models are discussed from two standpoints; the one is definition of the skeleton or backbone curve and the other is consideration of the initial stress. Finally, some suggestions to develop a new testing method that responds the demands of the times are shown.
2010-02-01