Approximate Methods for Analysing the Effects of Creeping and Shrinkage of Reinforced and Prestressed Concrete Constructions

Zejak, Danijela

doi:10.1016/j.proeng.2015.08.199

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…A bunch of diversified articles on the design, analysis, and construction of segmental bridges have been published by many researchers. Prime attention is given to estimating reliable values for the deformations and internal moment redistribution due to creep and shrinkage of concrete as the structural system is changing during successive construction phases [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. In particular, Bishara and Papakonstantinou [11] investigated the time-dependent deformation of cantilever construction bridges before and after closure.…”

Section: Introductionmentioning

confidence: 99%

“…( 1), proposed a slight alteration as reflected in Eq. (2), in order to determine the design moments in bridges constructed by the balanced cantilever method to account for time-dependent creep effects. They claim that there should be some limitations if applying Eq.…”

Section: Introductionmentioning

confidence: 99%

“…( 1): (i) to simulate the cantilevered construction, the term (1 − e −(φt−φc) ) describing the creep behavior of a cantilevered beam has been included in Eq. (2); and (ii) the term φ t /(1 + ρφ t ) in Eq. ( 1) is replaced by the functional f(φ t ) = χφ t /(1 + χφ t ) in Eq.…”

Section: Introductionmentioning

confidence: 99%

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Simulating creep induced moment redistribution in prestressed concrete bridges constructed by the balanced cantilever method: ad hoc traditional formulae versus real time-dependent analysis

Rashed¹,

Mehanny

2023

J. Eng. Appl. Sci.

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Assessing available numerical techniques adopted to determine the design time-dependent moment for prestressed concrete segmental bridges constructed by the balanced cantilever method is of utmost importance to the bridge design community. In essence, despite some apparent diversity, there are basically two key conventional approaches to compute the design time-dependent moment accounting for creep effects for this type of bridges. The first is a family of varied simplified methods typically known to practicing designers and with pre-consensus on their reliability and effectiveness. Time-dependent moments retrieved from these classical methods always reside in an intermediate state falling between the results from “two” time-independent analysis cases, namely, (a) sequentially adding all partial permanent loads and prestressing pertaining to various construction steps using the part-bridge structural system corresponding to each step, and (b) assuming all loads and prestressing forces to be applied at-once to the final completed bridge. The second approach is through performing real sophisticated step-by-step time-dependent analysis using a specialized software. The research primary objective is to assess the validity/reliability of commonly used ad-hoc approaches that evolved over the years relying on simplified analyses/formulae to cater for time-dependent creep effects for this type of bridges. Aiming at realistic conclusions, three case-study real-world segmental balanced cantilever bridges over the Nile River in Egypt are elected. Midas Civil commercial package is used to perform time-dependent finite element analyses for the three bridges. Main parameters considered are, inter alia, time-dependent effects of creep and shrinkage of concrete, relaxation of prestressed steel, losses due to friction and anchor setting of prestressing tendons, sequence of construction, and construction-driven temporary change of support conditions (where applicable). The study concludes that creep-induced moment redistribution from simplified traditional formulae typically adopted in the literature may lead to a considerable error in estimating the design time-dependent moment in balanced cantilever bridges.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simulating creep induced moment redistribution in prestressed concrete bridges constructed by the balanced cantilever method: ad hoc traditional formulae versus real time-dependent analysis

Rashed¹,

Mehanny

2023

J. Eng. Appl. Sci.

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A recurrence algorithm of time-dependent analysis for concrete bridges

Huang,

Yan,

Chen

et al. 2024

Structures

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Creep Coefficient for Self-Compacting Concrete (SCC)

SADIKU,

KAMBERI,

NAFEZI

2024

IJCESEN

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With the development of construction technology, self-compacting concrete hasstarted to be widely used in the construction of buildings. The specific properties of selfcompacting concrete have made it particularly useful for concreting the structuralelements of high-rise buildings. The strains characteristics of concrete are important toknow both in the initial stage of concreting and in the long process, in order to takemeasures to minimize their impact on cracking and reduction of structure elements.In this regard we have conducted an experiment to investigate shrinkage strains andcreep strains in reinforced concrete beams as well as the determination of the creepcoefficient. Given that the shrinkage and creep strains are together, it is necessary toseparate the creep strains from the shrinkage strains to determine the creep coefficient.For the realization of this separation, we have prepared the same samples which havebeen used for the determination of shrinkage strains and samples which have beeninserted into the mechanisms for the realization of adequate force for thedetermination of the creep strains.

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Approximate Methods for Analysing the Effects of Creeping and Shrinkage of Reinforced and Prestressed Concrete Constructions

Cited by 3 publications

References 16 publications

Simulating creep induced moment redistribution in prestressed concrete bridges constructed by the balanced cantilever method: ad hoc traditional formulae versus real time-dependent analysis

Simulating creep induced moment redistribution in prestressed concrete bridges constructed by the balanced cantilever method: ad hoc traditional formulae versus real time-dependent analysis

A recurrence algorithm of time-dependent analysis for concrete bridges

Creep Coefficient for Self-Compacting Concrete (SCC)

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