Verbundverhalten von vorgespannten Litzen in UHPC

Bertram, Guido; Hegger, Josef

doi:10.1002/best.201100060

Cited by 8 publications

(4 citation statements)

References 11 publications

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“…It should be noted that the achievable maximum bond stresses of sand‐coated CFRP rods strongly depend on the quality of the manufacturing of the coating. UHPC as a matrix exhibits excellent properties with respect to its bonding behavior to CFRP rods . The main reason is the fine grading curve of the UHPC and the mixing process, which give the material a very dense structure with hardly any capillaries.…”

Section: Conceptual Design Of Lightweight Structural Membersmentioning

confidence: 99%

Building lightweight structures with carbon‐fiber‐reinforced polymer‐reinforced ultra‐high‐performance concrete: Research approach, construction materials, and conceptual design of three building components

Kromoser

Preinstorfer

Kollegger

2018

Structural Concrete

107

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The building industry, and especially the concrete industry, consumes a considerable proportion of the natural resources extracted from the lithosphere and is responsible for a large part of the solid waste generated worldwide. Unfortunately, this fact has not yet generated a movement to counter the trend; rather, a huge increase in the use of concrete in new structures can be observed. It is imperative to counteract this development by optimally exploiting the material properties of concrete in order to improve its efficiency. One strategy being pursued at the University of Natural Resources and Life Sciences, Vienna and TU Wien is to reduce the amount of concrete and reinforcement in structures by using high‐performance materials such as carbon‐fibre‐reinforced polymers (CFRP) in ultra‐high‐performance concrete (UHPC) members. This permits a crucial reduction in the self‐weight and allows for the design of very lightweight precast concrete elements. The authors' goal is to use CFRP rods as bending reinforcement and a combination of flat and preformed CFRP textiles as shear and structural reinforcement. In the first part of this paper, the research approach is introduced and a comprehensive overview of the state of the art of UHPC and CFRP reinforcement is given. The second part contains a description of the conceptual design of some structural members (one floor element and two T‐beams), starting with the development of a suitable UHPC mixture. Furthermore, preliminary uniaxial tensile tests of textile‐reinforced UHPC strips are described and evaluated. In the final part of this paper, the authors present parameter studies for different reinforcement types, values, additional prestressing of the rod reinforcement and the first prototypes. They are used to give an estimation of the feasibility, the load‐bearing and deflection behavior of the proposed building components.

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Section: Conceptual Design Of Lightweight Structural Membersmentioning

confidence: 99%

Building lightweight structures with carbon‐fiber‐reinforced polymer‐reinforced ultra‐high‐performance concrete: Research approach, construction materials, and conceptual design of three building components

Kromoser

Preinstorfer

Kollegger

2018

Structural Concrete

107

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“…The steel fiber ratio was chosen to 0.9 Vol.‐% leading to an enhanced ductile behavior and good pouring quality. Higher ratios do not necessarily result in significantly better ductility and bond behavior of strands, but to ineffective pouring, since local conglomerations of fibers often take place without proper bond to the concrete matrix. For the application in sandwich panels, steel fibers were used rather than non‐metallic fibers, since a wide range of experience exists and only corrosion of the concrete surface occurs, without significant effect of the durability of the structure .…”

Section: Methodsmentioning

confidence: 94%

“…Ultra-high performance fiber reinforced concrete (UHPFRC) represents one of the major developments in structural concrete in the last 30 years. In several research projects and applications [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] the structural performance has been demonstrated. Another achievement in structural concrete is the development of reinforcement made of fiber reinforced polymer (FRP).…”

Section: Introductionmentioning

confidence: 99%

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Sandwich panels with folded plate and doubly curved UHPFRC facings

Stark

Claßen

Knorrek

et al. 2018

Structural Concrete

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Sandwich‐structured composites represent an efficient method to establish building envelopes which concurrently satisfy several demands. Besides low self‐weight with high load‐bearing capacity, sandwich panels provide sufficient physical properties, such as heat and sound insulation. In general, sandwich panels for applications in building industry are made of flat or thin profiled metal sheets or thick concrete facings. However, standard elements are limited to short spans. In contrast, spatially shaped concrete structures with folded plate or curved geometry provide high stiffness and load‐carrying capacity even for thin elements. The application of folded plate and curved concrete structures to sandwich panels combines the advantages of both construction methods. To realize thin facings in various shapes, high performance cementitious composites are advantageous. Ultra‐high performance fiber reinforced concrete (UHPFRC) provides high compressive and tensile strengths with ductile material behavior. The application of non‐corrosive reinforcement, for example, carbon fiber reinforced polymer (CFRP), allows for filigree concrete elements with a thin concrete cover to only fulfill bond requirements. For sandwich panels with folded plate or curved facings, new production methods are necessary to account for cross‐sections in various shapes. This paper introduces the basic ideas of non‐planar concrete sandwich elements for long‐span roof structures and the developed production methods.

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Verbundverhalten von CFK‐Spannbewehrungen in UHPFRC

Stark

Hegger

2013

Beton und Stahlbetonbau

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Bond behaviour of pre-tensioned CFRP tendons in UHPFRC The combination of pre-tensioned CFRP (Carbon Fiber Reinforced Plastics) tendons in UHPFRC (Ultra High Performance Fiber Reinforced Concrete) makes filigree and durable constructions with long spans possible, especially with the application of folded and curved shells. Due to a high corrosion resistance of pre-tensioned CFRP tendons, the concrete cover is governed by the bond behaviour to reach a crack-free transmission zone. In this paper the results of an experimental study on the bond behaviour of pre-tensioned CFRP tendons are presented and an outlook for planned investigations on UHPFRC shells is given.

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Verbundverhalten von vorgespannten Litzen in UHPC

Abstract: Ultrahochfester Beton (UHPC = Ultra-High Performance Concrete) ist hervorragend geeignet für vorgespannte Bauteile.

Cited by 8 publications

References 11 publications

Building lightweight structures with carbon‐fiber‐reinforced polymer‐reinforced ultra‐high‐performance concrete: Research approach, construction materials, and conceptual design of three building components

Building lightweight structures with carbon‐fiber‐reinforced polymer‐reinforced ultra‐high‐performance concrete: Research approach, construction materials, and conceptual design of three building components

Sandwich panels with folded plate and doubly curved UHPFRC facings

Verbundverhalten von CFK‐Spannbewehrungen in UHPFRC

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