Strengthening Bridges with Prestressed CFRP Strips

Siwowski, Tomasz; Żółtowski, P.

doi:10.2478/v10299-012-0021-2

Cited by 6 publications

(6 citation statements)

References 4 publications

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“…One year later, the second application with combined CFRP laminates and sheets was performed on the bridge over the Bystry canal [ 40 ]. Other Polish CFRP applications on the RC structures were published in [ 6 , 10 , 41 , 42 ]. Much more effective flexural strengthening with prestressed laminates was carried out in [ 7 , 43 , 44 , 45 , 46 , 47 ].…”

Section: Description Of Carbon Fiber Reinforced Polymersmentioning

confidence: 99%

“…Strengthening with prestressed CFRP materials requires a mechanical anchorage that properly transfers prestressing force to the strengthened member to avoid debonding of composite material from the concrete surface. The anchorage systems are highly complex due to additional devices based on the hydraulic jacks, which are used for prestressing the CFRP laminates [ 8 , 9 , 10 , 11 ]. Due to the mentioned parameters, the overall costs of strengthening with CFRP materials increases significantly.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Prestressing Methods with CFRP and SMA Materials in Flexurally Strengthened RC Members

Rogowski

Kotynia

2022

Materials

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Over the years, prestressing concrete has become a well-known technique to improve the ultimate and serviceability state of RC members. Besides steel reinforcement, relatively new materials such as carbon fiber reinforced polymers (CFRP) or especially shape memory alloys (SMA) can be used to active strengthening. The main scope of this paper is to compare various prestressing methods using carbon composites and memory steel alloys. A description of SMA, shape memory effect, its utilization for prestressing, and CFRP materials are presented in the paper. Moreover, current state-of-the-art developments in the field of both materials, considering prestressing systems and available anchorage, material behavior, creep and stress relaxation, durability issues, thermal compatibility with concrete, and fire behavior, are described. A general revision of previous studies based on flexural strengthening using both materials is conducted and the selected results of these studies are briefly presented. The behavior of RC beams after strengthening with mentioned techniques is compared and discussed. Selected on-site applications are described to confirm the feasibility and practicality of the strengthening systems. Finally, the main advantages and disadvantages of CFRP and SMA materials for prestressing concrete structures are summarized and further recommendations for the future research are listed.

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Section: Description Of Carbon Fiber Reinforced Polymersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of Prestressing Methods with CFRP and SMA Materials in Flexurally Strengthened RC Members

Rogowski

Kotynia

2022

Materials

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“…Її використовують для вирощування соняшнику, сої, картоплі, кукурудзи, цукрових буряків, капусти, озимих і ярих пшениці і ячменю, гречки, ріпаку та інших культур. [3,4,5].…”

Section: аналіз останніх досліджень і публікаційunclassified

“…Strip-till передбачає виконання чотирьох комплексів технологічних операцій: формування смуг, посів, догляд за сходами, збирання врожаю [3].…”

Section: рис 1 агрегат асог-8 виробництва тов «краснянське» сп «агрunclassified

Cultivator Development for New Soil Processing Technologies

Sereda

Shvets

2020

Engineering, Energy, Transport Aic

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Most scientists in the field of agronomy, especially abroad, with the emergence of the latest technologies No-till and Strip-till, called them revolutionary in crop production, yes, along with economic indicators, these technologies retain the fertile potential of the soil. This is achieved through less soil damage due to the minimum number of technological operations, as well as the obligatory cover of the field with plant residues after harvesting. American scientists have shown that with the correct application of these technologies, the main indicator of soil quality - humus does not decrease, but on the contrary - increases. This article analyzes the work of Strip-till units in Ukraine and proposes a KFG-3,6 soil tillage unit developed by scientists from the Department of Agroengineering and Technical Services. The main means that can prevent the loss of fertility of the earth is the introduction of energy saving and fertile technologies. The factors of soil injury and maximum cover of soil with plant residues were laid. The most well-known technologies are the technologies, quite widespread in the USA and Canada, where more than 50% of the land is cultivated, and also in Argentina where they make more than 50%. In Europe, countries such as Germany, France and the UK will cultivate about 10% of land, and in Ukraine will cultivate consist - only 5%. Strip-till technology came to Europe from the United States, where its No-till technology predecessor. At present, almost half of the largest corn crop in the United States is owned by Strip-till. No-till and Strip-till technologies are widely used in crop production. The main argument is to maintain fertility through compulsory soil cover. The Department of Agroengineering and Technical Service of the Vinnytsia NAU has for many years taught a course of lectures for masters on low-cost and environmentally promising technologies in crop production. Manufacturers of Kalina-Agromash agricultural machinery in Vinnytsia region are interested in developing a modernized KFG-3,6 cultivator for Strip-till technology, which is partially covered in this article.

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“…Since then, several concrete bridges have been strengthened using the NPS. 31 However, the main shortcoming of this system is the maximum prestressing force (85 kN), which is often not enough for bridge strengthening purposes. In the current research, the authors have developed a novel system (NPS II) with at least double capability in terms of tensioning force.…”

Section: Introductionmentioning

confidence: 99%

Experimental research on hybrid anchorages of prestressed composite strips for structural strengthening

Piątek

Siwowski

Michałowski

et al. 2021

Journal of Composite Materials

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The prestressed unidirectional carbon fibre reinforced polymer (CFRP) strips are currently often used for flexural strengthening of concrete structures. To ensure reliable strengthening, strips have to be anchored at their ends to the surface. However, anchoring of unidirectional CFRP strips is difficult because of their weak transversal mechanical properties. Although several CFRP strip anchorage approaches have been developed to date, only very few were applied on-site. The paper presents the development of hybrid bonded/bolted anchorages of CFRP strips used in a novel prestressing system. The anchorages are made of thin steel plates, clamped with the high-strength friction grip (HSFG) bolts and epoxy adhesive, to fix the CFRP strips. The paper describes the results of full-scale tests carried out on a series of axial tensile specimens. The developed anchorage has an ultimate tensile strength of about 200 kN, i.e. 70% of the ultra-high CFRP strips’ strength, which is sufficient for strengthening purposes. After a series of tests in the laboratory, the anchorages have been implemented on-site and an example is presented in the paper.

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Strengthening Bridges with Prestressed CFRP Strips

Cited by 6 publications

References 4 publications

Comparison of Prestressing Methods with CFRP and SMA Materials in Flexurally Strengthened RC Members

Comparison of Prestressing Methods with CFRP and SMA Materials in Flexurally Strengthened RC Members

Cultivator Development for New Soil Processing Technologies

Experimental research on hybrid anchorages of prestressed composite strips for structural strengthening

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