Long-term deflections of cantilever segmental bridges

Navrátil, Jaroslav; Zich, Miloš

doi:10.3846/bjrbe.2013.24

Cited by 14 publications

(11 citation statements)

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“…For a statically indeterminate bridge structure, which will experience the process of system transformation during construction, the influence of creep and shrinkage on the structural behavior is more complicated. Of the many analysis methods, the method of step‐by‐step recurrence can easily handle this complex process and can be combined with the existing general finite element method (FEM) software; thus, this method has been widely used in practical engineering . Equation indicates that the creep strain at t n and t n + 1 can be expressed as

C ((),,, t_{n + 1}, t_{j}, σ_{t_{j}}) - C ((),,, t_{n}, t_{j}, σ_{t_{j}}) = \frac{1}{(1 - d (t_{j}))} \sum_{i = 1}^{m} a_{i} ((), t_{j}) e^{- λ_{i} ((), t_{n} - t_{j})} ([], 1 - e^{- λ_{i} normalΔ t_{n + 1}}) .

…”

Section: D Creep and Shrinkage Calculation Model Based On Materials Nmentioning

confidence: 99%

“…Owing to their merits in construction, maintenance, and cost, long‐span prestressed concrete (PC) box girder bridges with the balanced cantilever method are widely used around the world. However, such bridges have generally suffered excessive deflection, cracking, and other diseases during their service lives . Bazant et al collected the excessive deflection histories of 56 PC box girder bridges around the world and found that the deflection of the bridges would last for a long time; thus, it was inferred that many other bridges suffer the same issue.…”

Section: Introductionmentioning

confidence: 99%

“…Even worse, the increased deflection will further promote the expansion of existing cracks and the emergence of new cracks. The unexpected deflection and cracking have profound impacts on the serviceability and safety of PC box girder bridges, and many researchers agree that the creep and shrinkage effects of concrete are the main causes of this phenomenon …”

Section: Introductionmentioning

confidence: 99%

“…For creep, in addition to the different effective thicknesses, simultaneously, the stress–strain distribution of box girders has obvious spatial characteristics under loads such as gravity and temperature. Therefore, it is necessary to consider the influence of the shear lag effect on the creep law . Using linear creep theory, Huang analyzed the long‐term deflection of the Jiangyin Yangtze River Bridge and found that the long‐term creep deformation value increased by 24.5% if the shear lag effect in box girders is considered.…”

Section: Introductionmentioning

confidence: 99%

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Three‐dimensional nonlinear creep and shrinkage effects of a long‐span prestressed concrete box girder bridge

Yang

et al. 2018

Structural Concrete

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To analyze the impacts of creep and shrinkage effects on the behaviors of long‐span prestressed concrete box girder bridges, a new nonlinear analysis model of creep and shrinkage effects that comprehensively considered three‐dimensional (3D) characteristics and girder damage evolution was presented. A corresponding numerical analysis method was implemented into the ABAQUS user‐supplied subroutine; this method was verified by comparing the analytical results to the classical experimental results. Finally, a continuous rigid frame bridge with a main span of 220 m was taken as an engineering example, and the analysis results and in situ measured data of long‐term deflection were compared. The results show that the 3D characteristic and the nonlinear property of creep have significant impacts on the prediction of long‐term deflection.

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C ((),,, t_{n + 1}, t_{j}, σ_{t_{j}}) - C ((),,, t_{n}, t_{j}, σ_{t_{j}}) = \frac{1}{(1 - d (t_{j}))} \sum_{i = 1}^{m} a_{i} ((), t_{j}) e^{- λ_{i} ((), t_{n} - t_{j})} ([], 1 - e^{- λ_{i} normalΔ t_{n + 1}}) .

…”

Section: D Creep and Shrinkage Calculation Model Based On Materials Nmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Three‐dimensional nonlinear creep and shrinkage effects of a long‐span prestressed concrete box girder bridge

Yang

et al. 2018

Structural Concrete

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“…In the following model, an example of a bridge pier (Strasky et al, 2001;Navratil, 2004;CNI, 2005;Parke and Nigel, 2008;Navratil and Zich, 2013;Sucharda and Brozovsky, 2013) is considered. To analyse interaction between the basement rock and foundation (see, e.g.…”

Section: Introductionmentioning

confidence: 99%

Influence of Contact Stress Model on the Stability of Bridge Abutment

Čajka¹,

Pustka²,

Sekanina³

2017

Proceedings of the 2nd Czech-China Scientific Conference 2016

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This chapter deals with the behaviour of an abutment pier on subsoil subjected to lood changes. The loods increase the cross-section of the river bed and change the properties of the foundation soil under the foundation. First, the soil saturates with water. Then, ine-grained particles will wash away and inally parts of the basement rock will be washed of. Finite element method has been used for the calculation of the interaction between the foundation and the subsoil. The foundation has been modelled in a 2D environment using spatial components. For the subsoil, an element with efects of an elastic foundation has been used. The stifness of the bedrock has been characterized by the C parameter. The chapter describes situations related to the collapse of the structure.

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