Abstract
One of the most important problems encountered during construction of structures on earthquake-suspected sites is to identify whether the site is liquefiable or not. Whenever a dynamic load such as an earthquake occurs, the strength of granular loose saturated soils decreases tremendously in a very short period of time. The shear strength of soils vanishes, and the soil changes from solid to liquid phase. This problem causes significant damage to both the structure and the foundation. Thus, it is important to determine an index which defines whether a site is liquefied. In this article, three-dimensional wavelet spectra of different earthquakes are drawn, and based on changes in the frequency contents of these earthquakes, a new index is developed in order to identify liquefied and non-liquefied sites. The proposed method is simple and efficient and is able to distinguish whether soil liquefaction occurs in a site just by using recorded earthquake accelerations available at the site.
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