The Equivalent Number of Cycles of Recorded Accelerograms for Soil Liquefaction Studies

摘要

Four different procedures are studied for determining the equivalent number of cycles of available recorded accelerograms, from the viewpoint of liquefaction of saturated sand deposits. The cyclic shear stresses acting in the soil are assumed to be proportional to the surface accelerations; therefore, the accelerograms are used for the calculations instead of the cyclic stress time histories. The first procedure is based on an equivalence rule for each recorded cycle, derived from a representative cyclic strength curve of sands. The other three methods use the excess pore-water pressure as the equivalence parameter.