Reinforcement data for fire safety design

Hertz, Kristian Dahl

doi:10.1680/macr.2004.56.8.453

Cited by 48 publications

(19 citation statements)

References 3 publications

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“…Exposed to fire, reinforced concrete (RC) elements exhibit a significant reduction in load capacity and stiffness. This is caused by a decrease in the mechanical properties of concrete and reinforcing steel due to high temperature (EN 1992(EN -1-2 2004fib Bulletin 38 2007;fib Bulletin 46 2008;Colina et al 2004;Abramowicz, Kowalski 2005;Bednarek, Kamocka 2006;Hertz 2004;Kodur 2014). During fire the slabs or beams are usually heated only from the bottom face.…”

Section: Introductionmentioning

confidence: 99%

Premature destruction of two-span RC beams exposed to high temperature caused by a redistribution of shear forces

Kowalski

Głowacki

Abramowicz

2016

Journal of Civil Engineering and Management

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When multi-span RC elements are exposed to fire one usually observes a yielding of span cross-sections while a safety reserve of support cross-sections is still significant. Due to this phenomenon a redistribution of bending moments occurs and the values of sagging moment in span cross-sections decrease while the values of hogging moment in support cross-sections increase. This paper shows the results of tests conducted on two-span RC beams in a situation when only one span has been exposed to high temperature from the bottom. The beams were 12×16 cm in their cross-section. The length of the span was 165 cm. The load has been applied by two forces put on each span. The beams were made of C25/30 concrete with siliceous aggregate. As a result of significant stiffness decrease of the heated span, redistribution of shear forces and bending moment occurs. Due to this redistribution the tested beams were prematurely damaged due to exhaust of the shear load bearing capacity in the middle part of the beam span where there was no transverse reinforcement.

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Section: Introductionmentioning

confidence: 99%

Premature destruction of two-span RC beams exposed to high temperature caused by a redistribution of shear forces

Kowalski

Głowacki

Abramowicz

2016

Journal of Civil Engineering and Management

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“…Moreover, it protects compression and tension zones against physical impact and fire, which can give rise to explosive spalling or damage the materials, as explained in Hertz. [3][4][5]7,8 In a super-light structure, the compression forces can be concentrated and placed wherever the designer wants them. Eugène Freyssinet invented prestressed concrete in 1903 (first patent 1928 9 ), in which tension forces are counteracted by unloading or partly unloading compression stresses with a centroid where the designer wanted the tension forces to be.…”

Section: Principle Of Super-light Concrete Structuresmentioning

confidence: 99%

Super-light concrete with pearl-chains

Hertz¹

2009

Magazine of Concrete Research

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The paper presents a new technology invented by the author by means of which it is possible to create very light concrete structures. The new super-light structures are resource-saving in terms of consumption of raw materials and energy for production and transport, and the cost is often less than half that of similar structures in concrete and steel. They are heat-insulating, fire-resistant and they open up the possibility for large spans and the creation of advanced shapes. Fields of application include roofs, shells, beams, columns, walls, façades, offshore structures, tunnels and structures with large spans for bridges, factories, warehouses, shopping centres, car parks, assembly and sports halls and so on. The new structures are new applications for well-understood components, so it is not necessary to prove that they are possible. However, the paper presents tests that were made to illustrate the applicability and to reveal any potential hidden problems. Continuing research will aim to reduce the weight and thereby the resource consumption further. In addition, the paper introduces pearl-chain reinforcement, which is a new principle for creating compression and tension zones. A small number of simple mass-produced prefabricated components are used to establish compression and tension zones for optimised or advanced shapes in super-light structures. Furthermore, the principle provides new options for prestressing light aggregate concrete structures in general. Pearl-chain reinforcement is self-supporting. It is visible and open for inspection before being cast into a structure, and it can support moulds for the structure, reducing the need for scaffolding. Stable meshes of pearlchain reinforcement are advantageous for both large-scale structures, such as bridges, girders, shells and domes, and for small-scale applications, such as façade elements, crash barriers and secondary structures. One special small-scale application of the principle is in frame building, where super-light frames with pearl-chain-reinforced components have some of the same advantages as timber-frame structures with regard to stability, heat insulation, economy and simple erection processes, but without the disadvantages of fire and rot.

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“…During 25 years the author has developed a set of methods for the design of any structure of any concrete at any time of any fire Hertz [1][2][3][4][5][6][7][8][9][10][11]. Parts of the methods have been adopted by the Eurocode [12] and the Danish structural codes [13,14].…”

Section: Structural Responsementioning

confidence: 99%

Assessment Of Performance-based Requirements For Structural Design

Hertz¹

2005

Fire Safety Science - Proceedings of the Eigth International Sy

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The paper presents how actions can be assessed for a performance-based structural fire safety design from the first formulations in the building program to the final derivations of the fire load to be applied for each structural member. In order to indicate what is of importance for the assessment of the requirements, a couple of simple analyses of structural response are made. The examples are chosen deliberately to show the difference between a traditional design based on standard fire resistance and a performance-based approach. A methodology is developed for a decision on the safety level and for a detailed assessment of the requirements. The design requirements to be used for a factory producing elements for industrial housing for unknown costumers are discussed, and a fully developed fire is recommended as a common requirement for domestic houses, hotels, offices, schools and hospitals. In addition it is shown how a fire brigade can be expected to perform in a building designed by means of the methodology.

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Reinforcement data for fire safety design

Cited by 48 publications

References 3 publications

Premature destruction of two-span RC beams exposed to high temperature caused by a redistribution of shear forces

Premature destruction of two-span RC beams exposed to high temperature caused by a redistribution of shear forces

Super-light concrete with pearl-chains

Assessment Of Performance-based Requirements For Structural Design

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