Study on Dynamic Hysteretic Nonlinear Property in time-domain of Site Soil from Site strong Response During March 11, 2011 Japan M9.0 Earthquake

SUMMARY: The analysis of hysteretic nonlinear property in time domain of site soils are rare at home and abroad for the complexity of soil dynamic nonlinear constituted relations, low efficiency of implicit integral formula, and low performance of optimized method. In view of these questions, this paper using soil dynamic double- parabola constitute model, which can consider the soil test damping ratio and can character main characteristic of soil’s hysteretic constituted relationship, associating with the highly effective explicit integral method with the high accuracy computation acceleration response, basing on 201103111446 M9.0 and its strong foreshock 201103091145 M7.2. The hysteretic nonlinear characteristic in time domain of the clay and the granite at FKSH19 borehole array are analyzed. The results indicated that, the modulus and the damping ratio of clay and the granite are consistent with the lab test results of Seed-Idriss. It is different that viscous damping effects in the strong earthquake and weak ground motion. The mechanism and the history of hysteretic nonlinear constituted relationship under seismic strong motion are reproduced. The results reveal the permanent displacement mechanism. Simultaneously, velocity history and displacement history of ground strong motion are forecasted and estimated.