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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국콘크리트학회 International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials Vol.15 No.2
- 발행연도
- 2021.3
- 수록면
- 233 - 253 (21page)
이용수
초록· 키워드
오류제보하기
Prestressed segmentally constructed balanced cantilever bridges are often subjected to larger deflections than those predicted by calculations, especially for long-term effects. In this paper, the case of modular balanced cantilever bridges, which are prestressed segmental bridges obtained through a repetition of the same double cantilever, is investigated. The considered bridges are two typical cases of modular balanced cantilever both subjected to large deformations during their lifetime. In this case, due to the unusual employed static scheme, creep deflections indefinitely evolve over time particularly at the end of the cantilevers and in correspondence with the central joint. These remarkable deflections cause discomfort for vehicular traffic and in certain cases can lead to the bridge collapse. Important extraordinary maintenance interventions were necessary to restore the viability of the bridges and to replace the viaduct design configuration. To this aim, the static schemes of the structures were varied, introducing new constraints, new tendons, and carbon fiber reinforcements. In the present work, time analysis was performed to compare the time-dependent behavior of the bridge according to two different creep models, the CEB-FIP Model Code 2010 and the RILEM Model B3, with the real-time-dependent behavior of the bridge observed during its lifetime. The two different employed models exhibit different behaviors in terms of displacements and bending moments acting on the bridge. Interesting considerations are made on their reliability in simulating the long-term creep effects that evolve indefinitely over time. Moreover, retrofitting techniques have been proposed and modeled to predict their effectiveness in reducing time-dependent deflections.
목차
Abstract
1. Introduction
2. Evolution of Material Properties
3. Description of the Navile and Sa Pruna Bridges
4. Description of the Typical Launch of Balanced Cantilever Bridges
5. Retrofitting of Unbalanced Cantilever Bridges
6. Finite Element Analysis
7. Results
8. Conclusions
References
참고문헌 (57)
참고문헌 신청
Aymerich, F. / 2020 / FE analysis of the fexural behavior of cementitious composites using the concrete damage plasticity model / Proceedings of Italian Concrete Days 2018. ICD 2018. Lecture Notes in CivilEngineering
Bazant, Z. P. / 1966 / Phenomenological theories for creep of concrete based on rheo- logical models / Acta Technica CSAV :82~109
Bazant, Z. P. / 1972 / Numerical determination of long-range stress history from strain history in concrete / Material and Structures 5:135~141
Bazant, Z. P. / 2015 / RILEM Model B4 (2015). Model B4 for creep, drying shrinkage and autogenous shrinkage of normal and high strength concretes with multi-decade applicability / Materials and Structures 48:753~770
Bažant, Z. P. / 1995 / Creep and shrinkage prediction model for analysis and design of concrete structures-model B3 / Matériaux et constructions 28(180):357~365
Bazant, Z. P. / 1966 / Phenomenological theories for creep of concrete based on rheo- logical models / Acta Technica CSAV :82~109
Bazant, Z. P. / 1972 / Numerical determination of long-range stress history from strain history in concrete / Material and Structures 5:135~141
Bazant, Z. P. / 2015 / RILEM Model B4 (2015). Model B4 for creep, drying shrinkage and autogenous shrinkage of normal and high strength concretes with multi-decade applicability / Materials and Structures 48:753~770
Bažant, Z. P. / 1995 / Creep and shrinkage prediction model for analysis and design of concrete structures-model B3 / Matériaux et constructions 28(180):357~365
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