Abstract
The current trends in steel construction intend to use tapered sections to minimize as much as possible the use of excess material. This can be done by choosing the cross-sections to be as economical as possible, leaving the classical approach of using prismatic members. In addition, it is important to predict the buckling behavior of tapered member with large depth-to-thickness ratio in order to prevent the collapse of PEB system subjected to overloads. An experimental investigation of buckling behavior of tapered beam was presented. The primary test parameter was depth-to-thickness ratio and taper ratio. Using initial stiffness and load-carrying capacity proposed by current provision, the simple plastic hinge method using modified Yoda's model and finite element analysis, the prediction of a moment-rotation curve of linearly tapered member was presented. Moreover, comparisons between analytical and experimental data for moment-rotation curves were accomplished.
저층 장스팬 철골프레임에는 강재절감을 위해 휨모멘트 저항을 극대화 한 판폭두께비가 큰 변단면 부재를 이용한 PEB시스템을 사용하고 있다. 과다한 외력에 의해 PEB시스템의 붕괴에 대한 안정성을 파악하기 위해서는 변단면 부재의 좌굴거동에 관한 실험 및 해석적 예측은 중요하다. 이에 본 연구에서는 변단면의 판폭(춤)두께비(d/t)와 변단면비를 주요 변수로 한 변단면 부재에 대한 실대형 실험을 행하였다. 현행 설계기준, 수정된 Yoda 모델을 이용한 소성힌지해석 및 유한요소해석으로 예측한 초기강성, 내력 및 모멘트-회전각관계에 대해서 실험결과와 비교하였다.
