Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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A Study on Simplified Analysis and Estimation Method for Evaluation of Structural Safety in Modular Underground Arch Structure

모듈러 지중아치 구조 안전성 검토를 위한 간략 해석 및 평가방법에 관한 연구

  • 권태윤 (경상국립대학교 건설시스템공학과) ;
  • 조광일 ((주)택한 연구개발팀) ;
  • 이원홍 (경상국립대학교 건설시스템공학과) ;
  • 안진희 (경상국립대학교 건설시스템공학과)
  • Received : 2022.03.18
  • Accepted : 2022.06.24
  • Published : 2022.06.30
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Abstract

A modular underground arch structure using steel and concrete has been proposed as a structure that has a simple construction process and can effectively resist cross-sectional forces generated during construction and use. Structural behavior of modular underground arch was evaluated about span length less than 15m through 3D structural analysis and test. In general, 2D and 3D structural analysis methods may be applied for structural analysis such as underground arch and tunnels. However, if a 2D or 3D structural analysis method is applied to evaluate the structural safety of a modular underground arch structure, it is difficult to model for structural analysis and it may take an excessively long time to interpret. Therefore, it may not be reasonable as a structural analysis method for considering the structural safety and earth pressure in the design process of a modular underground arch structure. In addition, when a modular underground arch structure is configured for span lengths to which the predetermined cross-section is applicable, it may be reasonable to evaluate only the safety of the structure and cross-section according to the cross-section and load conditions. Therefore, in this study, a structural analysis model using frame elements was proposed for efficient structural safety evaluation. In addition, structural analysis results of the 2D structural analysis model and the simplified analysis model using frame elements were compared, and the structural safety of the modular underground arch structure for a span length of 20m was evaluated with a simplified analysis method.

모듈러 지중아치 구조는 시공과정이 단순하며 강재와 콘크리트를 이용하여 시공 및 공용 중에 발생하는 단면력에 대하여 효과적으로 저항할 수 있는 구조로 제안되어 15m 이하의 지간에 대하여 3차원 구조해석 및 실험을 통하여 구조적 거동이 평가되었다. 일반적으로 지중아치와 터널 등의 구조해석의 경우 2차원이나 3차원 구조해석 방법이 적용될 수 있다. 하지만, 모듈러 지중아치 구조의 구조적 안전성 평가를 위하여 2차원이나 3차원 구조해석 방법을 적용할 경우 구조해석을 위한 모형화가 어렵고, 해석시간이 과도하게 오래 걸릴 수 있으므로, 모듈러 지중아치 구조의 설계과정에서 필요한 구조 안전성 및 토압 등을 고려한 구조해석 방법으로는 합리적이지 않을 수 있다. 또한, 사전에 결정된 단면이 적용가능한 지간에 대하여 모듈러 지중아치 구조를 구성하는 경우 지간과 하중조건에 따른 단면과 구조적 안전성만을 평가하는 것이 합리적일 수 있다. 따라서, 본 연구에서는 효율적인 구조 안전성 평가를 위하여 프레임 요소를 이용한 구조해석 모델을 제안하고, 2차원 구조해석모델과 프레임 요소를 이용한 간략해석모델의 구조해석 결과를 비교하였으며, 간략해석 방법을 이용하여 20m지간의 모듈러 지중아치구조의 구조적 안전성을 평가하였다.

Keywords

Acknowledgement

본 연구는 국토교통부 국토교통기술사업화지원사업(과제번호:22TBIP-C162186-02)의 연구비 지원으로 수행되었으며, 이에 감사드립니다.

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