| Summary: | 碩士 === 國立臺灣大學 === 土木工程學研究所 === 106 === The isolation systems are used to improve seismic capacity of the structure, increasing period makes the acceleration of superstructure decrease. Therefore, adding isolators can decrease the input energy, so that the superstructure keeps elastic under design earthquake, but the isolator will get lager displacement. In far-fault region, isolation system have been proven to be an effective way to improve structural seismic capacity. The difference between near-fault and far-fault earthquake is that near-fault record has pulse-like signal with a long period of velocity pulse (pulse period, Tp), the signal is able to make the isolator displacement be larger and lead isolation system damage.
This study would perform shaking table tests on a structure with frictional pendulum bearings in the second lab of NCREE (National Center for Research on Earthquake Engineering). The advantage of the shaking table in the second lab of NCREE is that the shaking table has powerful performance, long-stroke and high-velocity, so that it can simulate the characteristics of pulse-like records. The selected records divide into 5 groups: 10 pulse-like records with short Tp (group 1), 10 pulse-like records with medium Tp (group 2), 10 non-pule records (group 3), 10 record of artificial ground motions (group 4), and 5 records of famous earthquakes in Taiwan (group 5). To discuss the effect that the response of the isolation system when the records of different groups hit.
The results show that pulse period Tp is an important parameter for the response of isolation system; if the average response spectrum are similar, the average response of the isolation system are larger as the pulse-like records hit than as the non-pule records hit; even if the response spectrum of the artificial records is similar to the one of the pulse-like records, the response of the pulse-like record is larger than the one of the artificial records corresponding to the pulse-like record. In addition, the analytical model, FPBearingPTV, in OpenSees is used to compare with experimental results.
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