Buffeting Analysis for the Evaluation of Design Force for Temporal Supports of a Bundle Type Cable-stayed Bridge

번들 사장교 가설 구조물 설계력 산정을 위한 버페팅해석

  • 이호 (서울대학교 교량설계핵심기술연구단) ;
  • 박진 (서울대학교 건설환경공학부) ;
  • 김호경 (서울대학교 건설환경공학부)
  • Received : 2011.10.28
  • Accepted : 2011.11.21
  • Published : 2011.12.31

Abstract

Temporal supports is proposed for the large block construction of a double-deck truss girder of a bundle type cable-stayed bridge. The design force of the temporal bents cannot be evaluated by a conventional design procedure with gust factored static wind loads. The uplift forces in BS5400 also can not estimate the design forces of the temporal bents properly for the turbulent wind loads. A frequency-domain buffeting analysis is performed to evaluate the design forces of the temporal bents considering the interactions between the girder and temporal supports. Two cases of modeling are compared to estimate the stiffness contribution of temporal supports in determining design forces, i.e., an analysis model including temporal bents in the structural analysis modeling and an analysis model with fixed supports at the bent tops neglecting the stiffness of temporal bents. The consideration of bent stiffness usually generates smaller reaction forces than rigid support modeling. Consequently, the effectiveness and usefulness of the buffeting analysis procedure with full modeling of temporal supports are demonstrated for the design of a temporal bents of the construction of a bundle type cable-stayed bridge.

Acknowledgement

Supported by : 국토해양부

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