RTRI REPORT February 1999

Dynamic Analyses of Surface Soil and Design Seismic Motion on Ground Surface

Shinji NAGATSUMA, Haibo WANG
Yoshitaka MURONO, Akihiko NISHIMURA


  Assessment of seismic response of ground is very important for the aseismic design of structures, especially for very strong input motion, known as Level 2 seismic motion. Many analytical methods have been proposed, in which nonlinear behaviors of soil are investigated with either equivalent linear model or nonlinear model. But there are still many unsolved problems associated with the nonlinear behaviors of soil at large strain level. In the first part of this paper, both equivalent linear and nonlinear model are used in numerical simulations of shaking table test with a large scale laminar box, where the maximum strain in the soil is over 3%. The applicability of each method at large strain level is verified with experimental results. In the second part, surface grounds were classified into eight kinds of representative surface grounds based on the characteristic period. And the design seismic motion was set for each surface ground for the convenience of design.



Copyright (c) 1999 Railway Technical Research Institute