유사동적 하이브리드 지진응답 시뮬레이션 시스템 구축에 관한 연구

Abstract

Recently, frequency and magnitude of earthquakes are continually increasing on earth. Especially, the structures collapsed in Sichuan province (M8.0 earthquake, 2008, China) and Haiti (M7.0 earthquake, 2010) they are not designed considering the seismic loads. In contrast, structures constructed in some regions like in Japan and New Zealand they applied seismic design rules rigorously for most of the structures. Therefore after earthquake occurred, there were just small damaged in structures than same earthquake magnitude occurred in other places. In case of Korea, this region had categorized as seismic safety zone. But small to medium magnitude earthquakes were steady occurred. And frequency of earthquake also shows steady increment. Therefore, many of experts in earthquake engineering speak warning as no more safety in Korea region. Nowadays, many researchers are studying about the inelastic behavior of structures under dynamic load such as earthquake load. The existing test methods for analysis inelastic behavior of structure are quasi-static, pseudo-dynamic and shaking table tests. Quasi-static test is easy to apply to test device and test. But this method cannot consider dynamic effect. On the other hand, shaking table test can satisfy dynamic effect and have high accuracy. But that is very expensive for applying the testing system. And test specimen is also takes high cost to make. Moreover when scale-downed specimen by capacity of testing system, that makes decrease reliability of test results by scale-effect. Therefore, shaking table test is so complex and hard to test. Using quasi-static test system has economical advantage. Pseudo-dynamic test is applying displacement to real structure that calculated from numerical analysis program through connected loading test device. And calculate displacement again for next step using numerical analysis program applying measured restoring force after load. But all of the pseudo-dynamic tests in Korea perfectly dependent on foreign technology and also there are no adequate researches. Therefore in this paper, we developed pseudo-dynamic test method using Korean technologies and established for consistency by pseudo-dynamic test about small steel specimens. And we compare the test results with pure numerical analysis result, pseudo-dynamic online seismic response test method, for verification.