Analysis of the Measured Seismic Accelerograms and Response Analysis on the Polder Reclamation Embankment

A study on the vibration analysis of the polder reclamation embankment (II)

Abstract

In the previous paper (1) the authors conducted an embankment microtremor measurment at Iya Reclamation Land under construction, Naka-Umi Polder Reclamation Project, Shimane Prefecture, and decided on particular site of the embankment for making calculation of vibration.In this paper, the authors first investigated the characteristics of the measured seismic accelerograms and used these for response calculation.Secondly based on the various earthquake data on the site during more than last one hundred years, the authors computed the maximum acceleration value of a one hundred year probability and calculated the response values under the estimated magnitude to take into account the characteristics of measured accelerograms and discussed the possibility of liquefaction etc. The results are as follows;
(1) Measured seismic accelerograms considerably show nonstationary state.The authors conducted response calculation using these, so that it could be shown that the proposed model is capable of calculating the response values and taking the time history of measured record.
(2) As results of the response calculation of a so called'one hundred year probability earthquake', it was shown that nonlinearity and non-homogeneity of the vibration system affect the response values, and it is clear that the shear strain and shear stresses do not become great enough to harm the embankment.