Abstract
In this study, a cyclic torsional shear test using various seismic waveforms observed by the strongmotion seismograph networks, K-NET and KiK-net, was performed. Furthermore, the effect of the waveform and its duration on the liquefaction strength and its characteristics were explored. The test results were analyzed and compared with those obtained using a general sine wave. The used seismic waveforms were typical waveforms of the 2016 Kumamoto earthquake (inland earthquake), and the 2011 Great East Japan Earthquake (subduction earthquake). The weighting factor concerning the irregular nature of seismic wave C2 exhibited a correlation with the significant wave number. Moreover, it proved that the respective C2 values of Mashiki main shockwave and the Haramachi wave differed by a factor of 2. The evaluation of the liquefaction strength property with respect to the cumulative dissipation energy showed that the sine wave becomes nearly identical against the difference in the cyclic number. Meanwhile, the test results concerning the seismic waveforms showed that the cumulative dissipation energy among them differed by a factor of 10.
