FAILURE ANALYSIS OF GEOGRIDS WITH SUDDEN LOADING TO CO NSIDER SEISMIC SITUATION BY STEPPED ISOTHERMAL METHOD AS ACCELERATED CREEP TEST

초록

Accelerated creep test, the stepped isothermal method (SIM), can typically be performed in one day and use a single specimen, loaded continuously whilst being exposed to a sequence of timed isothermal events of increasing temperature. The development of the SIM test provides an opportunity to study the effect of simulated seismic events or the influence of other additional loads, occurring at different intervals of the life of the structure, on the long-term strength of geosynthetic reinforcement. In this paper, two simulated seismic SIM Tests were performed, one with a simulated seismic event at 23℃ step, the other tests carried out after 79℃ step. The reason for varying the time of application of the simulated seismic load was to study the effect of the timing of real life earthquakes. The purpose of this experiment is to assess the SIM procedure to identify the effect of simulated seismic events on the creep mechanism of geosynthetic reinforcement. The second was to quantitatively calculate creep reduction factor considering seismic event and to reflect this in the design property.