WUF-B 접합부 및 합성슬래브로 설계된 철골모멘트골조의 에너지 기반 근사해석을 이용한 연쇄붕괴 저항성능 평가

Abstract

본 연구는 WUF-B 접합부 및 합성슬래브로 설계된 철골모멘트골조를 대상으로 GSA 2003에 따른 연쇄붕괴 저항성능을 평가하였다. 대상구조물은 1, 2차원의 저감모델로 모델링하였고 기둥제거에 따른 동적효과가 고려된 에너지 기반 근사해석을 통해 구조 강건성 및 민감도를 평가하였다. 그 결과, 기준에 따른 연쇄붕괴 저항성능을 모두 만족하였다. 이는 합성슬래브가 구조물의 강성을 향상시킨 것으로 판단되었다. 내부기둥 제거 시 기둥제거로 인한 내력성능의 저하가 가장 크게 나타났으나 기준하중의 2.5배를 초과하여 저항하는 것으로 평가되었다.

The progressive collapse resistance performance of a steel structure constructed using the moment frame with the WUF-B connection and the composite slabs was evaluated. GSA 2003 was adapted for the evaluation. Additionally the structural robustness and the sensitivity against the progressive collapse were analyzed. In the numerical analysis, a reduced model comprised of the beam and spring elements for WUF-B connection was adapted. The composite slab was modeled using the composite-shell element. Instead of the time-consuming dynamic analysis for the effect of the sudden column removal, the equivalent energy-based static analysis was effectively applied. The analysis results showed that the structure was the most vulnerable to in the case of the internal column removal, however it satisfied the chord rotation criterion of GSA 2003 due to the contribution of the composite slab which improved the stiffness of structure. In the robustness evaluation, the structural performance showed more than 2.5 times of the requirement according to GSA 2003, and the structural sensitivity analysis indicated the decrease of 33% of the initial structural performance.