Dynamic Test of Structural Models Using $4m{\times}4m$ Shaking Table

$4m{\times}4m$ 진동대를 이용한 구조모델의 동적실험

  • 이한선 (고려대학교 건축공학과) ;
  • 우성우 (영남대학교 건축공학과) ;
  • 김병현 (한국기계연구원 구조시스템 연구부)
  • Published : 1997.03.01

Abstract

The objective of this study is to review the current state of earthquake simulation tecniques using the shaking table and check the reliability. One degree-of-freedom(d.o.f) and three d.o.f aluminium shear models were used and $4m{\times}4m$ 6 d.o.f shaking table was excitated in one horizontal direction to simulate 1940 El centro earthquake accelerogram (NS component). When the actual acceleration history of shaking table is compared to the desired one, it can be found that the overall histories are very similar, but that the lower frequency range (0~2 Hz) of the actual excitation has generally lower amplitude than that of the desired in Fourier transform amplitude. Free vibration and white noise tests have shown almost the some values for natural frequencies, but shown quite different values for damping rations, that is, 1.37% in case of free vibration test vs 14.76 % in case of white noise test. The time histories of story shear driff show the globally linear elastic behaviors. But the elliptical shape of the histories with one of the axis being the stiffness of the story implies the effect of viscous damping.

References

  1. P.C. 아파트의 내진 설계규준 제정을 위한 실험적 연구 이한선(외 31명)
  2. Structural Dynamics Paz, M.
  3. Dynamics of Structures: Theory and Applications Earthquake Engineering Anil, K.;Chopra, A.
  4. Dynamics of Structures Clugh, R.W.;Penzien, J.