비선형 동적해석을 이용한 축하중과 폭발하중을 동시에 받는 철근콘크리트 부재의 구조 거동 분석
Structural Behavior of Reinforced Concrete Members Subjected to Axial and Blast Loads Using Nonlinear Dynamic Analysis
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본 논문에서는 축하중과 폭발하중을 동시에 받는 철근콘크리트 부재의 구조 거동을 분석하였다. 기본적인 폭발하중을 받는 패널실험 데이터, 축하중과 폭발하중을 받는 철근콘크리트 기둥 실험데이터를 이용하여 비선형 동적해석 모델링을 검증하였다. 축하중의적용에 있어서 Autodyn은 동적해석만을 위한 프로그램이기 때문에 축하중과 같은 정적 하중에 대한 초기 응력 상태를 모사하는 해석절차를 제시하였다. 축하중비 0%~70% 구간과 TNT 등가량에 의존한 환산거리 1.1~2.0에 해당하는 매개변수를 선정하여 총 80개의비선형 동적 유한요소해석을 진행하였다. 축하중비와 환산거리의 변화를 통해 손상정도와 최대 변위 및 회전각으로 구조 거동을 비교 분석한 결과로 원거리 폭발하중에서 축하중을 받는 기둥의 강성 증가로 최대 변위가 감소한다. 결과적으로 축하중비 10%~30%,30%~50%, 50% 이상의 영역 3가지로 구조적 거동 분류가 가능함에 따라 내폭 설계 모델 개발에 활용될 수 있을 것으로 보인다.
Abstract
In this study, the structural behavior of reinforced concrete members under simultaneous axial and blast loads was analyzed. Nonlineardynamic analysis verification was performed using the experimental data of panels under fundamental blast load as well as those of reinforcedconcrete columns subjected to axial and blast loads. Because Autodyn is a program designed only for dynamic analysis, an analysis process isdevised to simulate the initial stress state of members under static loads, such as axial loads. A total of 80 nonlinear dynamic finite elementanalysis procedures were conducted by selecting parameters corresponding to axial load ratios and scaled distances ranging 0%-70% and1.1-2.0 (depending on the equivalent of TNT), respectively. The structural behavior was compared and analyzed with the correspondingdegree of damage and maximum lateral displacement through the changes in axial load ratio and scaled distance. The results show that themaximum lateral displacement decreases due to the increase in column stiffness under axial loads. In view of the foregoing, the formulatedanalysis process is anticipated to be used in developing blast-resistant design models where structural behavior can be classified into threeareas considering axial load ratios of 10%-30%, 30%-50%, and more than 50%.
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