주기적 하중을 받는 SCH 40 3-Inch 탄소강관엘보의 소산에너지 기반의 손상지수 평가
Damage Index Evaluation Based on Dissipated Energy of SCH 40 3-Inch Carbon Steel Pipe Elbows Under Cyclic Loading
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초록
지진하중으로 인한 배관계통의 파괴모드는 라체트를 동반하는 저주기 피로파괴이며 비선형 거동이 집중되고 파손이 발생하는 요소는 엘보인 것으로 나타났다. 본 연구에서는 저주기 피로에 의한 SCH 40 3인치 탄소강관엘보의 파괴기준을 정량적으로 표현하기 위하여 한계상태를 누수로 정의하고 면내반복가력실험을 수행하였다. 배관계통에서 지진하중에 취약한 요소인 탄소강관엘보에 대하여 모멘트−변형각의 관계를 이용한 손상지수를 나타내었으며 힘−변위의 관계를 이용하여 산정된 손상지수와 비교·분석하였다. 탄소강관엘보에 대하여 반복되는 외력에 의한 소산에너지에 기반을 둔 손상지수로서 누수가 발생한 한계상태를 정량적으로 표현하였다.
Abstract
The failure mode of piping systems due to seismic loads is the low-cycle fatigue failure with ratcheting, and it was found that the element in which nonlinear behavior is concentrated and damage occurs is the elbow. In this study, to quantitatively express the failure criteria for a pipe elbow of SCH40 3-inch carbon steel under low-cycle fatigue, the limit state was defined as leakage, and the in-plane cyclic loading test was conducted. For the carbon steel pipe elbow, which is the vulnerable part to seismic load of piping systems, the damage index was represented using the moment−deformation angle relationship, and it was compared and analyzed with the damage index calculated using the force−displacement relationship. An attempt was made to quantitatively express the limit state of the carbon steel pipe elbow involving leakage using the damage index, which was based on the dissipated energy caused by repeated external forces.
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