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http://dx.doi.org/10.7734/COSEIK.2012.25.3.245

Simplified Analysis Formula for the Interaction of the Launching Nose and the Superstructure of ILM Bridge  

Lee, Hwan-Woo (부경대학교 토목공학과)
Jang, Jae-Youp ((주)대한콘설탄트)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.25, no.3, 2012 , pp. 245-258 More about this Journal
Abstract
ILM(incremental launching method) is a way of construction, installing a girder producing spot behind the abutment, making the bridge girder infilled with concrete continuously and launching with using by jack. The superstructure of the bridge constructed by this method is temporarily located on the center of the span and the supporting points under construction. Therefore, the sections are structurally undergone maximum positive moment, maximum negative moment, and maximum shear force arising from self weight. On the other hand, launching nose is attached to the front of the girder to decrease the cantilever effect. The magnitude of this temporary stress creating on the upper section is dependent upon the launching nose's characteristics. This study has proposed an analysis formula simplified on the assumption that the launching nose section is a quasi-equivalent section(rigid; equivalent section, weight; tapered section) in order to ensure the accuracy of the analysis formula and improve its usage with reference to the interaction between the launching nose and the upper section; and a prismatic analysis formula modified by displacing a diaphragm's weight by a concentrated load in order to improve the accuracy of the existing analysis formula that assumes the launching nose section as the equivalent section. To judge the accuracy and usage of two analysis formulas proposed, we have compared and analyzed computational structural analysis programs and existing analysis formulas based on actual ILM bridge data. As a result, all of two reveal the superior accuracy and also their usage has been improved by the simplification of analysis formulas.
Keywords
ILM bridge; launching nose; simplified analysis; quasi-equivalent section;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 김광수 (2008) 파형강판 PSC 박스거더 교량의 설계 및 시공 중 안전관리,한국안전학회지, 23(2), pp.87-97.
2 안태욱, 이환우, 정두회 (2006) 변단면 압출추진코와 ILM 교량 상부단면의 상호작용 해석, 한국전산구조공학회 논문집, 19(2), pp.139-150.
3 이환우, 장재엽 (2010) 상부단면과의 상호작용을 고려한 ILM 교량용 압출추진코의 최적화 설계식, 한국전산구조공학회 논문집, 23(1), pp.53-60.
4 최항용, 서석구, 오명석, 오세환 (2008) 압출가설시 발행사는 휨모멘트의 최소화 조건을 통한 압출노즈의 최적설계, 대한토목학회 논문집, 28(4A), pp.487-495.
5 (주)마이다스아이티 (2009) MIDAS Civil 2009, (주)마이다스아이티.
6 Renaud, F., Marc, B., Olivier, B., Pierre, L. (1999) Design of a Curved Incrementally Launched Bridge, Journal of the International Association for Bridge and Structural Engineering, 9(2), pp.128-132.
7 Rosignoli, M. (1998). Nose-Deck Interaction in Launched Presstressed concrete bridge. Bridge Engineering, 3(1), pp.21-27.   DOI
8 Rosignoli, M. (1999). Presizing of Prestressed Concrete Launched Bridge. ACI Structural Journal, 96(5), pp.705-710.
9 Rosignoli, M. (2000). Thrust and Guide Devices for Launched Bridges, Bridge Engineering, 5(1), pp.75-83.   DOI
10 Rosignoli, M. (2002) Bridge Lunching, Thomas Telford Ltd., London.
11 Sasmal, S., Ramanjaneyulu, K., Srinivasm, V., Gopalakrishnan, S. (2004) Simplified Computa- Tional Methodology for Analysis and Studies on Behaviour of Incrementally Launched Continuous Bridges, Structural Engineering and Mechanics, 17(2), pp.245-266.   DOI
12 Sasmal, S., Ramanjaneyulu, K. (2006) Transfer Matrix Method for Construction Phase Analysis of Incrementally Launched Prestressed Concrete Bridges, Engineering Structures, 28, pp.1897-1910.   DOI