EVALUATION OF LARGE-SCALE SEISMIC TESTING METHODS FORELECTRICAL SUBSTATION SYSTEMS

摘要

To evaluate the feasibility of three groups of experimental techniques to perform large-scale seismictesting for electrical substation systems, we compared quantitatively their waveforms with recordedacceleration records from the Landers and Northridge earthquakes. The three testing methods underinvestigation in this study were: (1) Shake table (10' and 2' displacement limit); (2) Undergroundexplosive blasts based on data from the Nevada Test Institute (NeTI) facility at the Nevada Test Site; (3)Uncontrolled mining explosions based on data from the Black Thunder Mine (BTM) event of April 3rd,1997. Based on the analysis results, it is concluded that full-scale experiments are difficult to perform withsmall (2' displacement limit) shake tables due to their inherent velocity and displacement limitations. ).However, among the three groups of records, the analysis results for the large shake table (10'displacement limit) records are the closest to the results for their corresponding earthquake records.Regarding the NeTI facility, due to the large input energy generated by the detonation of the explosives, itis evident that specimens will dissipate energy through non-linear cyclic response, and will sustainconsiderable structural damage. Finally, the BTM small excitation duration prohibits energy dissipationthrough hysteretic cycles, and as a result the feasibility of large-scale seismic testing with uncontrolledmining explosions remains questionable.