Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Optimal Design of Linear Viscous Damping System for Vibration Control of Adjacent Building Structures

인접구조물의 진동제어를 위한 선형감쇠시스템의 최적설계

  • 박관순 (동국대학교 건축공학부) ;
  • 옥승용 (서울대학교 교량설계핵심기술연구단) ;
  • 고현무 (서울대학교 지구환경시스템공학부)
  • Published : 2006.06.30
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Abstract

This paper proposes an optimal design method of linear viscous dampers for the seismic performance of two adjacent structures with different heights. Accordingly, connection method using diagonal bracing between two floors and connection method between two structures are considered, and the effectiveness of the latter method is confirmed through the comparison of the frequency response functions with respect to damping capacity. Moreover, optimal damping to minimize the response of the adjacent structures in the frequency domain is found. The sensitivity of natural frequency and modal damping according to the damper capacity at each floor is obtained for the optimally designed system. From the sensitivity analysis, the modal damping is evaluated to be very sensitive to the damper installed at higher floor. Therefore, sensitivity-based damping distribution method is proposed. Diagonal bracing connection method, uniform distribution method and sensitivity-based distribution method are compared to each other in terms of seismic performance. The comparative results demonstrate that the proposed method is an effective seismic design method for the adjacent structures.

이 논문에서는 서로 다른층 높이를 갖는 인접한 두 빌딩의 내진성능을 효율적으로 향상시킬 수 있는 선형 점성 감쇠기의 최적 설계방법을 제시하고자 한다. 이를 위하여 층간 대각 브레이싱 형태의 에너지 소산장치 연결방법과 인접 구조물간 에너지 소산장치 연결방법을 고려하였으며, 두 가지 연결방법을 적용한 시스템에 대한 감쇠용량별 주파수응답함수 비교를 통하여 구조물간 연결방법의 효율성을 확인하였다. 아울러 구조물간 연결방법에서 주파수응답함수를 최소화하는 최적 감쇠용량이 존재하는 것을 보이고, 최적 설계된 시스템에 대하여 감쇠용량별 구조물의 고유주파수 및 등가감쇠비의 민감도를 분석하였다. 민감도 분석 결과로부터 고층부에 설치되는 에너지 소산장치가 구조물의 등가 감쇠비를 효율적으로 증가시키는 것을 확인하였다. 따라서 민감도에 비례하는 새로운 감쇠기 설계방법을 제시하고, 대각 브레이싱 연결방법과 구조물간 연결로서 균등분포 및 제시하는 민감도 기반 분포에 따른 연결방법을 적용한 시스템들의 내진성능을 비교 분석하였다. 지진응답의 비교결과, 제시하는 방법이 인접 구조물의 효과적인 내진설계방법이 될 수 있음을 입증하였다.

Keywords

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