1 A Simplified Method for Dynamic Response Analysis of Soil-Pile-Building Interaction System in Large Strain Levels of Soils －

We propose a simplified model to simulate the dynamic response of soil-pile-building interaction with embedment at large soil strain. The model consists of the Sway-Rocking model and an equivalent linearization method. Results of scalded shaking table tests were used to evaluate the accuracy of the proposed method. A part of the model ground was made of Plasticine and oil, whose stiffness and damping dependency on strain are similar to those of clayey soils. The input motion used are 1968 Hachinohe EW and 1940 El Centro NS and the peak accelerations were set to be 100, 300 600 cm/s2 at the shaking table. Test results show the average maximum soil strain was 0.001 to 0.013 and the natural frequency and the amplification factor decreased by 58 % and 41%, respectively. The transfer functions between the ground surface and the building obtained by the analysis and those obtained from the tests were very close. The difference in peak acceleration at the building obtained from the test and analyses were within 20%