Nose-Deck Interaction in Launched Prestressed Concrete Bridges

Rosignoli, Marco

doi:10.1061/(asce)1084-0702(1998)3:1(21)

Cited by 24 publications

(9 citation statements)

References 1 publication

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“…압출추진코의 최적설계를 위한 최적화 기법 (Fontan et al, 2011)이나, 상부구조와 압출추진코의 상호작용이 고려 된 ILM 상부구조 단순 해석식 (Rosignoli, 1998;Lee et al, 2006;2012) 및 예비설계용 최적화 설계식 (Lee et al, 2006;Choi et al, 2008)에 관한 연구가 수행되었다.…”

Section: Ilm 교량 상부구조물 단면의 최적설계를 위해서는 압출 추진코와의 상호작용이 고려된 해석과 압출추진코의 최적설unclassified

Simplified Analysis of Superstructure Section Considering Diaphragm and Optimum Design Conditions for ILM Bridge

Lee

Park²

2014

jcoseik

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ILM(Incremental Launching Method) bridges pass both the middle of spans and supports during launching. The launching noses are used to minimize the maximum positive moments and negative moments of the superstructure occurring during launching for ILM bridges. In this study, the simplified analysis formula considering diaphragm to calculate the bending moment that occurs during launching is induced and analyzes the optimum design conditions considering diaphragm. The accuracy of the proposed simplified analysis formular compared to the MIDAS Civil has an error of less than 5%. There is a difference up to 13% in the moment between the cases when the diaphragm is considered and is not. In addition, the criteria for deciding the unit weight of equivalent cross section and average stiffness value of equivalent cross section that can be applied to the simplified analysis formula is proposed. In this study, an effective way to optimize the launching nose is proposed that the optimum design is taken in the condition of minimizing the negative moment because of the mechanic characteristic of ILM bridges.

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Section: Ilm 교량 상부구조물 단면의 최적설계를 위해서는 압출 추진코와의 상호작용이 고려된 해석과 압출추진코의 최적설unclassified

Simplified Analysis of Superstructure Section Considering Diaphragm and Optimum Design Conditions for ILM Bridge

Lee

Park²

2014

jcoseik

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“…Because the significance of this construction procedure, public bodies (AASHTO 2007) and researchers all over the word have been interested in providing rules and presenting improvements on this type of bridges (Rosignoli 1997(Rosignoli , 1998(Rosignoli , 1999a(Rosignoli , 1999b(Rosignoli , 2000(Rosignoli , 2002Bouchon et al 1999;Göhler and Pearson 2000;Marzouk et al 2007;Sasmal et al 2004;Sasmal and Ramanjaneyulu 2006;Wang et al 2010;Choi et al 2009). Designing launched bridges requires not only the dimensioning of the bridge deck, that is usually a concrete box, but also the launching nose needs to be defined efficiently as the length of this device influences the distribution of bending moments in the bridge.…”

Section: Figure 2 Examples Of Launching Bridgesmentioning

confidence: 99%

Cost Optimization in Bridge Construction: Application to Launched Bridges

Hernández

Fontán

2014

Structures Congress 2014

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Launched bridges are a usual typology for medium span length up to 100 m approximately. An important device in this construction procedure is the launching nose that is a steel structure located in front of the deck and intended to decrease the bending moments of the cantilever portion of the bridge during launching. The research conducted by the authors on this type of structures was aimed to decrease the amount of material and thus the cost of the bridge. Two different problems were tackled out. First the length of the launching nose was chosen as the objective function with the aim of diminish the bending moment in the bridge. Secondly an optimization problem was defined considering both the length of the launching nose and the internal dimensions of bridge deck as design variables and defining the weight of the bridge and the launching nose as objective function. To make easier for practitioners to deal with this design procedure a graphical interface was written and is also presented.

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“…2 In addition, the webs increase the cost of materials and labour, since they are the most difficult element to cast of the whole cross-section. 13. External prestressing produces a first improvement of the cross-sectional efficiency and reduces the cost of materials and labour.…”

Section: Folded-plate Prestressed Composite Sectionmentioning

confidence: 99%

Prestressed Concrete Box Girder Bridges With Folded Steel Plate Webs.

Rosignoli¹

1999

Proceedings of the Institution of Civil Engineers - Structures

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In a prestressed concrete box girder bridge, the need to contain and deviate the longitudinal tendons of the internal prestressing increases the web thickness and the self-weight of the deck. As the span increases, the reduction of dead load is a primary need. It is the most important load, resisted first by the construction equipment, and then by the structure itself. Reductions to dead load permit savings in equipment costs while creating a reserve for service loads. External prestressing allows the combination of conventional materials to create innovative prestressed composite structures. Compared with conventional prestressed concrete box girders, these structural schemes are lighter and more efficient, and may extend the field of application of several conventional construction techniques.

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Nose-Deck Interaction in Launched Prestressed Concrete Bridges

Cited by 24 publications

References 1 publication

Simplified Analysis of Superstructure Section Considering Diaphragm and Optimum Design Conditions for ILM Bridge

Simplified Analysis of Superstructure Section Considering Diaphragm and Optimum Design Conditions for ILM Bridge

Cost Optimization in Bridge Construction: Application to Launched Bridges

Prestressed Concrete Box Girder Bridges With Folded Steel Plate Webs.

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