Pasarela de hormigón de muy alto rendimiento sobre el Barranco de las Ovejas (Alicante)

Serna, Pedro; López, Juan; Coll, Hugo; Camacho, Esteban; Navarro‐Gregori, Juan; Galán, Fernando

doi:10.1016/j.hya.2014.12.001

Cited by 9 publications

(11 citation statements)

References 1 publication

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“…The cost of concrete structures is also more predictable as steel material prices are very volatile, with price fluctuations that are several times larger those of cement. Many new solutions for concrete support structures are currently being developed [31][32][33]. Consequently, it is necessary to examine these developments with respect to offshore wind turbines, taking into account the conditions under which future offshore wind farms will be constructed and operated.…”

Section: Introductionmentioning

confidence: 99%

Concrete Support Structures for Offshore Wind Turbines: Current Status, Challenges, and Future Trends

2021

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Today’s offshore wind turbine support structures market is largely dominated by steel structures, since steel monopiles account for the vast majority of installations in the last decade and new types of multi-leg steel structures have been developed in recent years. However, as wind turbines become bigger, and potential sites for offshore wind farms are located in ever deeper waters and ever further from the shore, the conditions for the design, transport, and installation of support structures are changing. In light of these facts, this paper identifies and categorizes the challenges and future trends related to the use of concrete for support structures of future offshore wind projects. To do so, recent advances and technologies still under development for both bottom-fixed and floating concrete support structures have been reviewed. It was found that these new developments meet the challenges associated with the use of concrete support structures, as they will allow the production costs to be lowered and transport and installation to be facilitated. New technologies for concrete support structures used at medium and great water depths are also being developed and are expected to become more common in future offshore wind installations. Therefore, the new developments identified in this paper show the likelihood of an increase in the use of concrete support structures in future offshore wind farms. These developments also indicate that the complexity of future support structures will increase due to the development of hybrid structures combining steel and concrete. These evolutions call for new knowledge and technical know-how in order to allow reliable structures to be built and risk-free offshore installation to be executed.

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Section: Introductionmentioning

confidence: 99%

Concrete Support Structures for Offshore Wind Turbines: Current Status, Challenges, and Future Trends

2021

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“…There are various types of fibers designed for the reinforcement of concrete: steel, glass, polymeric and natural ones, among others. Among of them, steel and polyolefin fibers provide structural characteristics to concrete [3][4][5][6][7]. Some concrete Standards [8][9][10][11][12] include the use of steel and polymer macro fibers for structural purposes if certain requirements are met.…”

Section: Introductionmentioning

confidence: 99%

“…This may enable the reduction of the rebar reinforcement ratio in reinforced concrete, both for bending and shear [13][14][15], while reducing cracking [16,17], and in particular the width of macro cracks. Some examples of structural fibers can be seen in [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

New Methodological Approach towards a Complete Characterization of Structural Fiber Reinforced Concrete by Means of Mechanical Testing Procedures

et al. 2020

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This work proposes a novel methodology for the complete characterization of fiber reinforced concrete (FRC). The method includes bending tests of prismatic notched specimens, based on the Standards for FRC, tensile and pure shear tests. The values adopted by the standards for designing FRC are the obtained from bending tests, typically fR3, even for shear and pure tension loading. This paper shows that the remaining strength of FRC, supplied by the fibers, depends on the type of loading. In the case of shear and tensile loading the prescriptions of the standards may be unsafe. In this work, the remaining halves of specimens subjected to bending test are prepared and used for shear and tension tests. This means significant savings in specimen preparation and a greater amount of information for structural use of FRC. The results provide relevant information for the design of structural elements of FRC compared with the only use of data supplied by bending tests. In the case of tensile tests, fLOP values are 42% of the strength of the equivalent bending results, being 31% the average reduction in remaining resistance in comparison with the bending test. Pure shear tests showed, for 0.5 mm shear displacement, that the shear resistance is greater than 160% of that expressed according to bending tests. In addition, a video-extensometry system was used to analyze the crack generation and cracking patterns. The video-extensometry applied to shear tests allowed the assessment of the sliding values and crack opening values at the crack discontinuity. These values may be quite relevant for the study of the FRC behavior when subjected to shear according to the shear-friction model theories.

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“…There are various types of fibers designed for the reinforcement of concrete: steel, glass, polymeric and natural ones, among others. Some of them might provide structural characteristics to FRC [3][4][5][6][7]. Some concrete Standards [8][9][10][11][12] include the use of steel and polymer macro fibers for structural purposes if certain requirements are met.…”

Section: Introductionmentioning

confidence: 99%

New Methodological Approach Towards a Complete Characterization of Structural Fiber Reinforced Concrete by Means of Mechanical Testing Procedures

Alberti¹,

Iranzo²,

Gálvez³

et al. 2020

Preprint

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This work proposes a novel methodology for the complete characterization of fiber reinforced concrete (FRC). The method includes bending tests of prismatic notched specimens, based on the Standards for FRC, tensile and pure shear tests. The values adopted by the standards for designing FRC are the obtained from bending tests, typically fR3, even for shear and pure tension loading. This paper shows that the remaining strength of FRC, supplied by the fibers, depends on the type of loading. In the case of shear and tensile loading the prescriptions of the standards may be unsafe. In this work, the remaining halves of specimens subjected to bending test are prepared and used for shear and tension tests. This means significant savings in specimen preparation and a greater amount of information for structural use of FRC. The results provide relevant information for the design of structural elements of FRC compared with the only use of data supplied by bending tests. In addition, a video-extensometry system was used to analyze the crack generation and cracking patterns. The video-extensometry applied to shear tests allowed the assessment of the sliding values and crack opening values at the crack discontinuity. These values may be quite relevant for the study of the FRC behavior when subjected to shear according to the shear-friction model theories.

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Pasarela de hormigón de muy alto rendimiento sobre el Barranco de las Ovejas (Alicante)

Cited by 9 publications

References 1 publication

Concrete Support Structures for Offshore Wind Turbines: Current Status, Challenges, and Future Trends

Concrete Support Structures for Offshore Wind Turbines: Current Status, Challenges, and Future Trends

New Methodological Approach towards a Complete Characterization of Structural Fiber Reinforced Concrete by Means of Mechanical Testing Procedures

New Methodological Approach Towards a Complete Characterization of Structural Fiber Reinforced Concrete by Means of Mechanical Testing Procedures

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