Uncertainty Analysis of Creep and Shrinkage Effects in Long-Span Continuous Rigid Frame of Sutong Bridge

Pan, Zuanfeng; Fu, Chung C.; Jiang, Yong

doi:10.1061/(asce)be.1943-5592.0000147

Cited by 54 publications

(19 citation statements)

References 7 publications

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“…The importance of creep and shrinkage in reinforced concrete beams is well recognized . Over its lifetime, the local strain within a cross section can attain values several times larger than the initial elastic strain, and this can cause undesired serviceability problems in structural members where deflections or crack widths are excessive . Serviceability failures of concrete structures involving excessive cracking or deflection are not uncommon, even in structures that comply with code requirements .…”

Section: Introductionmentioning

confidence: 99%

Long‐term data of reinforced concrete beams subjected to high sustained loads and simplified prediction method

Reybrouck

Criel

Mullem

et al. 2017

Structural Concrete

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In 1967-1985, a research campaign comprising a unique set of long-term experimental data on concrete beams was conducted in joint collaboration with four Belgian research institutes to determine the influence of creep and shrinkage on the long-term behavior of reinforced concrete members. The main aim of the research campaign was the determination of the long-term behavior of cracking and deformations subjected to permanent loads considering the influence of the magnitude of the loads and various reinforcement ratios. The objective of this article is twofold: to provide an overview of the measured data of the reinforced beams of the research campaign, which has never been published before, and to propose a simplified calculation method based on available models in literature that can predict the available measurement data. A simplified calculation model is proposed, which accounts for nonlinear creep strains due to high stresses, shrinkage, aging, and cracking in reinforced concrete beams. This numerical method is based on a cross-sectional analysis formulated using the layered Euler-Bernoulli beam theory, allowing fast and accurate predictions of strains, stresses, and deflections as a function of time based on fib Model Code 2010 and EN1992-1-1. The measurements of the beams subjected to high permanent loads during a time period of 4 years are compared to the results evaluated with the proposed simplified calculation model. The results show that the proposed simplified calculation method based on the current models of EN1992-1-1 and fib Model Code 2010 can predict the long-term behavior of reinforced concrete beams subjected to high loads in good agreement with the measurements.

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Section: Introductionmentioning

confidence: 99%

Long‐term data of reinforced concrete beams subjected to high sustained loads and simplified prediction method

Reybrouck

Criel

Mullem

et al. 2017

Structural Concrete

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“…Bazant and Kim (1989, 1991) investigated the random long-term deflection and internal forces of prestressed concrete (PSC) segmental box-girder bridges with LHS. Subsequently, Yang (2005, 2007), Pan et al (2011), and Ma and Wang (2013) extended those previous research works into practical engineering application. On serviceability reliability analysis, Li and Melchers (1992) and Stewart (1996) analyzed the uncertainty of creep and shrinkage using Monte Carlo simulation (MCS).…”

Section: Introductionmentioning

confidence: 86%

Stochastic long-term behavior of a reinforced concrete arch bridge

Yang

Xiang

2017

Advances in Structural Engineering

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Beipanjiang Bridge, a railway-reinforced concrete arch bridge with span of 445 m, is located in Guizhou, China. The self-shored technology with a frame of concrete-filled steel tube is applied in this construction, in which the frame performs as the falsework for casting concrete into arch ring and also serves as the major reinforcement of the permanent structure. The time-variant behaviors of long-span concrete arch bridge may be sensitive to the creep and shrinkage of concrete, especially when the staged construction is applied. Owing to the random property of concrete creep and shrinkage, the stochastic analysis is necessary to be employed in order to give a more rational and objective evaluation about the structural long-term behaviors. A hybrid approach including Monte Carlo sampling based on response surface method is developed in this study, based on which the statistical results of long-term deflection and time-variant stress are discussed. Finally, the stochastic contributions of input variables to structural responses are investigated with the sensitivity analyses.

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“…The results of the scaled specimen in the field gave information about the losses that could be expected for the actual bridge, but it must be noted that the measurements were only carried out over 1 year. The reason for carefully estimating the prestress losses for the Sutong Bridge is that the collapse of the Koror‐Babeldaob bridge in Palau has been attributed to excessive creep and prestress losses, and that the maximum deflection at midspan after 7 years in service of the Huangshi Yangtze River Bridge in China was 32 cm higher than predicted. Similar problems have been observed in Switzerland, where long‐term monitoring of prestressed concrete balanced cantilever bridges using hydrostatic leveling showed that these structures had undergone large deformations and required strengthening .…”

Section: Literature Reviewmentioning

confidence: 99%

Long‐term material and structural behavior of high‐strength concrete cantilever bridge: Results of 20 years monitoring

Lantsoght

Veen

Boer³

et al. 2018

Structural Concrete

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In 1997, the Second Stichtse Bridge was built in the Netherlands using the balanced cantilever method. The use of high‐strength concrete was proposed. At that time, the long‐term behaviour of this material was not known, and no code provisions were applicable. Therefore, it was proposed to monitor the material behaviour and the deflections of the bridge. To evaluate the development of the concrete compressive strength and the concrete splitting tensile strength over time, concrete cubes were cast at the same time as each of the cantilever segments, and stored inside the bridge. These samples have been tested at different points in time to study the development of the strength as a function of the elapsed time. Creep and shrinkage measurements were carried out on samples stored inside the bridge as well as in the laboratory. Temperature and moisture were monitored as well. The deflections of the bridge superstructure have been measured periodically. These measurements can be compared to predictions from finite element models. Based on the available data, it is found that the concrete compressive and splitting tensile strength remain constant. The deflections are small, and the advanced finite element models resulted in good predictions.

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Uncertainty Analysis of Creep and Shrinkage Effects in Long-Span Continuous Rigid Frame of Sutong Bridge

Cited by 54 publications

References 7 publications

Long‐term data of reinforced concrete beams subjected to high sustained loads and simplified prediction method

Long‐term data of reinforced concrete beams subjected to high sustained loads and simplified prediction method

Stochastic long-term behavior of a reinforced concrete arch bridge

Long‐term material and structural behavior of high‐strength concrete cantilever bridge: Results of 20 years monitoring

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