In this paper, the dynamic snapping of the 3-free-nodes spatial truss model was studied. A governing equation was derived considering geometric nonlinearity, and a model with various conditions was analyzed using the fourth order Runge-Kutta method. The dynamic buckling phenomenon was observed in consideration of sensitive changes to the force mode and the initial condition. In addition, the critical load level was analyzed. According to the results of the study, the level of critical buckling load elevated when the shape parameter was high. Parallelly, the same result was caused by the damping term. The sensitive asymmetrical changes showed complex orbits in the phase space, and the critical load level was also becoming lowly. In addition, as the value of damping constant was high, the level of critical load also increases. In particular, the larger the damping constant, the faster it converges to the equilibrium point, and the occurrence of snapping was suppressed.

Abstract
1. 서론
2. 3-자유절점 모델의 지배방정식
3. 동적 좌굴과 임계 하중 레벨
    3.1 형상 파라미터에 따른 좌굴 하중 레벨
    3.2 비대칭 하중에 대한 동적 좌굴 특성
    3.3 초기 조건에 따른 동적 좌굴 특성
    3.4 감쇠비에 대한 좌굴 하중 레벨
    3.5 고찰
4. 결론
References

• 손수덕(한국기술교육대학교 건축공학과) | Shon Sudeok (Dept. of Architectural Eng., Koreatech University)
• 황경주(서울시립대학교 건축학부) | Hwang Kyung-Ju (School of Architecture, University of Seoul) 교신저자