In the conventional effective stress method of site seismic response analysis

the changes of small strain shear modulus Gmax are only with the effective stress and void ratio. While the latest experimental studies show that under large amplitude vibration

there exists additional attenuation of Gmax. 298 groups of Gmax data of different types of soil under large amplitude vibration are collected and analyzed

based on which the computational equations corresponding to two additional attenuation modes of Gmax are provided. A one-dimensional site seismic response analytical program has been compiled based on effective stress principle

to account for the influence of additional attenuation of Gmax. A typical example and a dynamic centrifuge model test of sand field are separately simulated using the compiled program. It turns out that

the additional attenuation of Gmax has influence on both the response of accelerations and shear stresses. Besides

it can speed up the liquefaction of site and expand the final liquefied range. Numerical simulation of the centrifuge model test shows that

the acceleration and pore pressure responses are in good agreement with the experimental results when considering additional attenuation of Gmax. However

in case of strong acceleration

liquefaction comes soon

and the influence of additional attenuation of Gmax on site dynamic response becomes weakened instead.