2024 Volume 24 Issue 1 Pages 1_18-1_32
It is important to appropriately set the nonlinearity of subgrade reaction characteristics in seismic calculations of buried pipes subject to ground deformation such as fault displacement etc. In the seismic design guidelines and standards related to buried pipes, the nonlinearity of subgrade reaction characteristics is based mainly on experimental data. On the other hand, in recent years, analysis technology has advanced and it has become possible to analyze elasto-plastic properties up to large deformation regions. Therefore, this paper reports the results of analyzing the mechanical features based on the results of two-dimensional elasto-plastic analysis that reproduces the results of subgrade reaction force experiments of buried pipes. Based on the results of FEM analysis, we consider a simple method for approximating the subgrade reaction force of yielding condition using Rankine's plasticizing stress and the comparing result is shown.
