기계식 이음 PE관의 응답변위법 기반 내진성능평가 요령
Seismic Performance Evaluation of Mechanically Jointed PE Pipeline by Response Displacement Method
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초록
지진 시 매설 PE관은 파단시 신장율이 우수하여 상대적으로 우수한 내진성능을 보이는 것으로 보고되고 있다. 국내 융착식 PE관의응답변위법 기반 내진성능평가 절차를 제안한 바 있으나, 기계식 이음 PE관에 대한 절차는 부재한 실정이다. 이에 본 연구에서는 기계식 이음PE관의 응답변위법 기반 내진성능평가 절차를 제시하였다. 기계식 이음 PE관의 경우 분절관의 평가 절차를 따르며, 관체 발생응력, 이음부 신축변형률 및 이음부 휨 각도 평가를 수행하도록 제안하였다. 또한 지반의 축방향 변형률 산정에 필요한 지반의 불균질성 계수를 도입하였다. 지반 액상화 우려가 있는 지반에 대한 측방 변위 및 재압밀 침하량 계산 방법도 함께 제안하였다. 국내 지반 환경을 고려한 민감도 해석 결과, 일정 품질이 확보된 기계식 이음 PE관은 지반 액상화를 고려하지 않을 때, 양호한 구조적 지진 안전성을 보였다. 본 절차는 주로 소규모 관경의 배관 접합에 사용하는 기계식 접합 매설 PE관의 내진설계 및 내진성능평가에 활용할 수 있을 것으로 판단된다.
Abstract
The seismic performance of buried PE pipes is reported to be favorable due to their exceptional elongation capacity at break. Although a seismic performance evaluation procedure based on the response displacement method has been summarized in Korea for fusion-bonded PE pipes, there is currently no procedure available for mechanically jointed PE pipes. This article aims to present a seismic performance evaluation procedure based on the response displacement method specifically designed for mechanically jointed PE pipes in Korea. When employing the mechanical joining method for PE pipes, it is recommended to adhere to the evaluation procedure established for segment-type pipes. This involves assessing the stress induced by the pipe, the expansion and contraction strain of the joint, and the bending angle of the pipe joint. Furthermore, the coefficient of inhomogeneity of the soil, which is necessary for estimating the axial strain of the ground, is introduced. Additionally, a computation method for determining lateral displacement and reconsolidation settlement in soil susceptible to liquefaction is proposed. As a result of the sensitivity analysis considering the typical soil condition in Korea, the mechanically jointed PE pipe with a certain quality was shown to have good structural seismic safety when soil liquefaction was not considered. This procedure serves as a valuable tool for seismic design and evaluating the seismic performance of mechanically joined buried PE pipes, which are primarily utilized for connecting small-diameter pipes.
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