Abstract
The liquefaction resistance of sands depends on the density, and the magnitude and wave form of the shear stress. In this paper, cyclic torsion shear tests and cyclic simple shear tests are conducted to study the influence of the wave form of shear stress on the liquefaction resistance using 11 shear wave forms. The test results are investigated on the load irregularity factor which is the ratio of the liquefaction strength of an irregular wave to that of a sinusoidal wave. The load irregularity factor is analyzed by using the effective wave number which is defined as half the number of half waves of shear stress larger than 60% of the maximum shear stress. Also, the wave form correction factor is proposed using the effective wave number to consider the irregularity of the shear stress wave in the liquefaction prediction method based on the grain size distribution and the standard penetration test N-value.
