Analytical Evaluation of Blast Resistance of H-shaped Columns Considering Gravity Load

Lee, Kyungkoo; Roh, Jieun; Kim, Seonwoong

Journal of the Korean Society of Hazard Mitigation 2013;13(2):31-36.
Published online April 30, 2013.

중력하중을 고려한 H형강 기둥의 방폭성능에 대한 해석적 평가

이경구, 노지은, 김선웅

Analytical Evaluation of Blast Resistance of H-shaped Columns Considering Gravity Load

Kyungkoo Lee, Jieun Roh, Seonwoong Kim

Abstract

The behavior of columns under blast loading is very important for blast resistance and progressive collapse resistance of frame structures. In this paper, the blast resistance of H-shaped columns considering initial gravity load was evaluated using finite element analysis method. To this end, three-step analyses of intial gravity load analysis, blast analysis, and residual compression analysis, were conducted by varying the amounts of initial gravity load and blast load. Based on the analysis results, the blast resistance of a column was evaluated in terms of the deformation of column and the residual compressive strength of the damaged column. Also, the relationship between the blast-induced deformation and residual compressive strength of a H-shaped column was derived.

Key Words: H-shaped column; Blast resistance; Gravity load; Finite element analysis; Residual compressive strength

요지

골조구조물의 방폭성능과 연쇄붕괴저항성능에 있어서 폭발하중을 받은 기둥의 거동은 매우 중요하다. 본 논문에서는 초기중력 하중을 고려한 H형강 기둥의 방폭성능을 유한요소해석을 통해 평가하였다. 이를 위해, 다양한 중력하중크기와 폭발하중크기를 적용하여 초기중력하중해석, 폭발해석, 잔여압축해석의 3단계 해석을 수행하였다. 해석 결과를 토대로, 기둥의 폭발변형과 폭발 후 잔여압축강도 면에서 기둥의 방폭성능을 평가하였다. 또한, H형강 기둥의 폭발변형과 잔여압축강도의 관계를 유도하였다.

핵심용어: H형강 기둥; 방폭성능; 중력하중; 유한요소해석; 잔여압축강도