The influence of time-dependent phenomena in segmental construction of concrete cable-stayed bridges

Arici, Marcello; Granata, Michele Fabio; Recupero, Antonino

doi:10.3233/brs-2011-030

Cited by 17 publications

(5 citation statements)

References 8 publications

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“…The proposed methodology is based on the matrix of influence method, and relies on the determination of the cable forces on n+2 elastic models, n denoting the total number of cables. It can be applied in correspondence with any construction phase and can be easily generalized to account time dependent phenomena due, e.g., to material viscosity [21], and/or fracture damage [24]. Such a bridge design technique can also be applied to prestressed concrete structures, arch bridges with suspended decks, and all prestressable structures [25]- [31].…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

On the Optimal Design of Cable-Stayed Bridges

Carpentieri¹,

Modano²,

Fabbrocino³

et al. 2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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This paper studies cable-stayed bridges (CBSs), with special focus on the initial force distributions in cables during construction phases. An algorithm for the optimal design of the pre-tensioning sequence of cables is presented. A procedure for the optimization of cable forces is developed, according to a given objective function. Particular attention is given to the choice of the parameters to be optimized, and numeric examples are provided. The proposed method is employed to study the At Tannumah bridge in Basrah, Iraq; and is suitable for the optimization of the pre-tensioning sequence of arbitrary cable-stayed bridges. We show in the rest of the paper that an initial design (named S 0 configuration) that does not include any pre-tensioning forces in cables can lead to a highly non uniform bending moment distribution over the deck; which is not ideal for an optimal structure. Fort that reason we develop an "optimal design" (named S d configuration), that corresponds to pre-tensioning forces inducing an "optimal" bending moment distribution over the deck.

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Section: Discussionmentioning

confidence: 99%

“…The procedure belongs to the "force equilibrium methods" [11], acting directly on the internal forces and indirectly on the elastic deformations. The proposed procedure is suitable for any construction sequence, and can be generalized to account for time-dependent phenomena [21].…”

Section: Introductionmentioning

confidence: 99%

On the Optimal Design of Cable-Stayed Bridges

Carpentieri¹,

Modano²,

Fabbrocino³

et al. 2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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“…is method has been successfully applied to 10 Advances in Civil Engineering cable-stayed bridges and also to arch bridges with cantilever construction supported by temporary stays [26]. Arici et al [27] also proposed a methodology of stay stressing with the final target of reaching a continuous beam on rigid supports behavior for the dead load configuration. Some practical suggestions are given to designers, in order to minimize time-dependent effects on deck and stay internal forces and to reach an optimal final configuration.…”

Section: Adjustment Of Tension In New Cable Staysmentioning

confidence: 99%

Replacement of Cable Stays in Yonghe Bridge in Tianjin, China

2020

Advances in Civil Engineering

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Cable replacement is one of the most important approaches for retrofitting an existing cable-stayed bridge. The Yonghe Bridge opened to traffic in 1987 and was the largest concrete cable-stayed bridge in Asia at the time. After nearly 20 years in service, its stay-cable system was completely replaced. The present paper details the key technical points of cable replacement in this bridge, including causes of replacement, cable replacement design, construction monitoring during replacement, and cable tension tuning after replacement. Based on the measurements during construction, the variation in structural condition indexes was thoroughly investigated, such as cable forces throughout the bridge, geometry profile of bridge deck, and tower horizontal displacements. The structural changes due to cable replacement were evaluated, and then, a relatively desirable scheme of cable adjustment was correspondingly put forward. The measured results showed that, influenced by the accumulated tolerances of cable forces during construction, cable replacement may often lead to a further deviation of structural condition. In this instance, cable adjustment is an effective compensation measure to improve the overall structural condition of the bridge. The practice of cable replacement in the Yonghe Bridge has provided some valuable experience or beneficial references for the similar retrofitting cases.

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“…About the first target an acceptable procedure for bridge erection has to be established, because the sequence of stay stressing is of fundamental importance to achieve the desired final state of stress and deformation (Granata et al 2013c;Negrão, Simões 1997). Moreover, in concrete bridges, in which creep effects can be significant, the final state can change with time (Arici et al 2011;Granata et al 2013b). The construction stages of a cable-stayed bridge consist of a sequence of partial schemes in which the cantilever construction is usually adopted.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless it implies a precise determination of displacements at each stage and the introduction of a complex staged construction analysis on a finite element software. Arici et al (2011) solved the problem by stating the so-called "partial elastic scheme (PES) method", applied mainly to concrete cable-stayed bridges and to concrete arches built by the suspended cantilever method (Granata et al 2013c) and by lattice cantilevers (Granata et al 2013a). In some cases a single-phase stressing of each stay is not sufficient to achieve the desired result because the partial schemes are too flexible or the construction sequence is more complex.…”

Section: Introductionmentioning

confidence: 99%

A mixed approach for determination of initial cable forces in cable-stayed bridges and the parameters variability

Recupero

Granata

2015

The Baltic Journal of Road and Bridge Engineering

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The determination of initial cable forces in cable-stayed bridges is an important first step in design and analysis of the structure under external loads. Adjustments of stay forces are often required during construction in order to assure the requested behaviour of the bridge in terms of final geometrical configuration and internal force distribution. An accurate assessment of the stay tensioning system allows designers to obtain a good result at the end of construction, by considering the parameters involved as deterministic quantities, assuring the observance of the execution tolerances during works. Actual loads and their variations need instead a stochastic approach which can give useful indications about the effects of parameter variations. Particularly, the measurement on site of the actual values of stay elongations contains errors and the actual values of prestressing forces and working site loads are subjected to unknown variations. In this paper a procedure is implemented which takes into account the stochastic variation of stay elongations and the related uncertainties. The presented method does not require large computational efforts or computer memory. By approximating the probability density distribution of the variables involved by the Gaussian curve, a closed form expression of the imposed elongations given to stays and their variations during erection is provided. The main aim is to obtain an accurate prediction of the differences between the deterministic quantities found by the design analyses and the actual values of deck deformations and stresses in the erection of steel cable-stayed bridges.

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The influence of time-dependent phenomena in segmental construction of concrete cable-stayed bridges

Cited by 17 publications

References 8 publications

On the Optimal Design of Cable-Stayed Bridges

On the Optimal Design of Cable-Stayed Bridges

Replacement of Cable Stays in Yonghe Bridge in Tianjin, China

A mixed approach for determination of initial cable forces in cable-stayed bridges and the parameters variability

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