The anchorage capacity of reinforcing bars at normal and high temperatures

Hertz, Kristian Dahl

doi:10.1680/macr.1982.34.121.213

Cited by 69 publications

(29 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Node segments may contain facilities for anchorage of prestressed or slack reinforcement, and the size and shape can be designed to utilise compression stresses from bearings and compression zones to improve the anchorage capabilities by counteracting splitting stresses. 12 A multitude of anchorage details and prestressing methods are available as shown for example by Leonhardt 13 and Gerwick,14 in addition to the original methods described by Freyssinet.…”

Section: Connectionsmentioning

confidence: 99%

“…If axial forces are to be transferred between light concrete and a pearl-chain, the anchorage capacity can be assessed as a minimum of splitting strength and bond strength using the formulae in Hertz. 12 The bond strength is proportional to the diameter and the compressive strength of the concrete. The low bond strength of the light concrete is counteracted by the large diameters of the pearl-chain segments.…”

Section: Connectionsmentioning

confidence: 99%

See 1 more Smart Citation

Super-light concrete with pearl-chains

Hertz¹

2009

Magazine of Concrete Research

View full text Add to dashboard Cite

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.

show abstract

Section: Connectionsmentioning

confidence: 99%

Section: Connectionsmentioning

confidence: 99%

Super-light concrete with pearl-chains

Hertz¹

2009

Magazine of Concrete Research

View full text Add to dashboard Cite

show abstract

“…The different studies showed a significant effect of steel rebar surface characteristics, concrete confinement, concrete basic properties (w/c ratio, cement and aggregate type, additives), maturity, and relative humidity, and testing condition (heating and cooling duration and rate, and testing while hot or cold) on concrete-steel bond behavior under a wide range of high temperature conditions [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…The works published about the mechanical performance of plain and RC under elevated temperatures stipulated the benefit of using pozzolanic matter and carbonate aggregate as well as insulation of concrete against moisture intrusion on maintaining post-heating strength and the concretesteel bond [10][11][12][13][14][15][16][17][18][19]. Recently, there has been an increasing interest in using metallic and polymeric fibers in ordinary and high strength concrete mixtures to improve the resistance of the concrete to elevated temperatures of up to 1000 1C [20,21].…”

Section: Introductionmentioning

confidence: 99%

Effect of elevated temperature on bond between steel reinforcement and fiber reinforced concrete

Haddad

AlSaleh

Al-Akhras

2008

Fire Safety Journal

149

View full text Add to dashboard Cite

“…This subject has therefore been a main area of his research for 25 years, leading to a system of methods for design of beams, slabs, columns, walls and analyses of anchorage and spalling based on a continuous material research programme and supplemented with full-scale tests for verification of the design methods. This work will be documented in a series of papers mainly intended for MCR, where the present deals with basic idealised materials data for reinforcement, except the anchorage capacity, which has been published in Hertz 1 and quenched qualities, which will be treated separately.…”

Section: Introductionmentioning

confidence: 99%

Reinforcement data for fire safety design

Hertz¹

2004

Magazine of Concrete Research

View full text Add to dashboard Cite

Idealized materials data are derived from a number of test series reported in the literature and made by the author. The data cover a variety of reinforcing steels from mild steel, deformed bars and cold-worked bars to cold-drawn prestressing steels. Processes are described that are responsible for the deterioration of the materials when they are heated and cooled down. A simple expression is established for the description of deterioration curves for fireexposed materials such as concrete and reinforcement by means of five parameters that may be used as input data for structural fire safety calculations instead of the more troublesome application of curves or tables. This new idealized representation is compared with test data and with other idealized curves for the materials presented, and recommended design values are given. Warnings are given for misleading curves and expressions from the structural codes. The paper serves as a basis for a number of papers presenting calculation methods developed by the author for the loadbearing capacity of constructions of any concrete at any time of any fire exposure. Some of these methods and materials data are adopted in the CEN code and national codes such as the Danish DS411. The paper serves as a part of the documentation for the methods and is therefore also a supporting document for these standards.

show abstract

The anchorage capacity of reinforcing bars at normal and high temperatures

Cited by 69 publications

References 0 publications

Super-light concrete with pearl-chains

Super-light concrete with pearl-chains

Effect of elevated temperature on bond between steel reinforcement and fiber reinforced concrete

Reinforcement data for fire safety design

Contact Info

Product

Resources

About