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

  • 제28권4호
  • /
  • Pages.1-12
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  • 2024
  • /
  • 2234-6937(pISSN)
  • /
  • 2287-6979(eISSN)
한국구조물진단유지관리공학회 (Korea Institute for Structural Maintenance Inspection)
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강사장교 비선형거동과 하모니 서치 알고리즘에 기반한 사장교 구성 단면 결정

Determination of Structural Member Section based on Nonlinear Behaviors of Steel Cable-Stayed Bridges and Harmony Search Algorithm

  • 마상수 (경상국립대학교 건설시스템공학과, 국토안전관리원) ;
  • 권태윤 (경상국립대학교 건설시스템공학과) ;
  • 이원홍 (경상국립대학교 건설시스템공학과) ;
  • 안진희 (경상국립대학교 건설시스템공학과)
  • Sang-Soo Ma ;
  • Tae-Yun Kwon ;
  • Won-Hong Lee ;
  • Jin-Hee Ahn (Gyeongsang National University)
  • 투고 : 2024.05.16
  • 심사 : 2024.06.18
  • 발행 : 2024.08.31
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초록

본 연구에서는 강사장교의 비선형 거동과 하모니 서치 알고리즘에 기반한 사장교 부재 단면 결정 방법을 제시하였다. 하모니 서치 알고리즘은 초기값 설정, 하모니 메모리 초기화, 새로운 하모니 메모리 구성 및 하모니 메모리 업데이트의 과정을 반복하여 최적값을 탐색함으로써 사장교 부재 단면을 결정한다. 하모니 서치 알고리즘으로 선정된 주요 부재 단면으로 3차원 강사장교의 비선형 초기형상해석을 수행하였으며, 초기장력과 형상을 고려하여 복잡한 거동특성과 각 부재의 비선형성을 반영한 사장교 주요 부재인 주탑, 보강거더, 가로보 및 케이블의 최적 단면을 결정하였다. 사장교 주요 부재의 단면 결정을 위한 목적함수로는 전체 중량을 사용하였으며, 제약조건으로 한계상태설계법을 바탕으로 하중저항능력과 사용성에 대한 제약조건식 및 보강거더와 가로보 단면의 폭과 높이의 비율을 추가적인 제약조건으로 고려하고, 주탑, 보강거더 및 가로보의 기하 및 재료 비선형성과 케이블 부재의 비선형성에 따라 부재 단면을 결정할 수 있도록 하였다. 최적 단면 결정 결과, 제안한 해석 방법은 사장교의 다양한 설치조건에 따라 최적 단면을 결정할 수 있으며, 비선형성을 고려한 사장교 부재 단면제원을 하모니 서치 기법을 통하여 결정할 수 있음을 확인하였다.

In this study, a determination method of structural member section based on Nonlinear behaviors of steel cable-stayed bridges and the Harmony Search algorithm was presented. The Harmony Search algorithm determines the structural member section of cable-stayed bridges by repeating the process of setting the initial value, initializing the harmony memory, configuring the new harmony memory, and updating the harmony memory to search for the optimal value. The nonlinear initial shape analysis of a three-dimensional steel cable-stayed bridge was performed with the cross-section of the main member selected by the Harmony Search algorithm, and the optimal cross-section of the main members of the cable-stayed bridge, such as pylons, girders, cross-beams, and cables, reflecting the complex behavior characteristics and the nonlinearity of each member was determined in consideration of the initial tension and shape. The total weight was used as the objective function for determining the cross-section of the main member of the cable-stayed bridges, and the load resistance ability and serviceability based on the ultimate state design method were used as the restraint conditions. The width and height ratio of the girder and cross-section were considered additional restraint conditions. The optimal sections of the main members were made possible to be determined by considering the geometry and material nonlinearity of the pylons, girders, and cross-sections and the nonlinearity of the cable members. As a result of determining the optimal cross-section, it was confirmed that the proposed analysis method can determine the optimal cross-section according to the various constraint conditions of the cable-stayed bridge, and the structural member section of the cable-stayed bridge considering the nonlinearity can be determined through the Harmony Search algorithm.

키워드

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