THE SHAKING TABLE TEST ON AN SDOF MODELSTEEL STRUCTURE FOR SIMULATED CRITICAL EARTHQUAKEUSING TARGET EARTHQUAKE

摘要

Using the NS component of acceleration record with peak acceleration (PA) of 818 cm/s2 observed byJapan Meteorological Agency (JMA) in the 1995 Kobe earthquake as target earthquake, a criticalearthquake which causes greater response on a 1:8 SDOF model steel structure accompanied with adamper was simulated and shaking table test was carried out. Through static experiment nonlinear asbilinear parameters of the model were determined and used in the simulation process. By free vibrationtest the natural period (0.2 s) of the model was confirmed and the damping ratio (2%) was determined.The simulation was conducted by the product of artificial wave generated from modified power spectraldensity (PSD) function and envelope function at consecutive time intervals of target. The modificationwas performed by amplifying the PSD graph of target at each time interval in a specified widthcorresponding to the structural response and reducing it in the other parts in which the areas under thePSD-frequency diagrams in the original and modified ones to be same.Because of inevitable difference between an input wave to shaking table and the output wave, shakingtable experiments were carried out five times for each case of target and critical earthquakes. The resultsshowed good agreement with those of theoretical analysis.