Concrete strength for fire safety design

Magazine of Concrete Research - Tập 57 Số 8 - Trang 445-453 - 2005
Kristian Dahl Hertz1
1Department of Civil Engineering, Brovej Building 118, Technical University of Denmark DK-2800 Kgs. Lyngby, Denmark

Tóm tắt

Idealised data have been derived for the compressive strength of a number of concretes for fire safety design. The data are derived from the author's own research including test series not published before and from more than 400 other test series comprising approximately 3000 specimens known from literature and personal contact. The data cover a variety of concretes with aggregates such as siliceous materials, limestone, granite, sea gravel, pumice, and expanded clay to fire-resistant concrete based on chamotte or Danish mo-clay. Processes are briefly described that are responsible for the deterioration of the materials when they are heated and when they are cooled down after a fire. In addition, it is explained how variations of the concrete composition influences the deterioration. Necessary characteristics of design methods are derived for variable fire courses based on analyses of consequences of material deterioration. The paper serves as a basis for a number of papers presenting calculation methods developed by the author for load-bearing capacity of any structure of any concrete at any time of any fire exposure. Some of these methods and related materials data are adopted in the CEN: ENV 1992-1-2 code and national codes such as the Danish DS411. The present paper serves as a part of the documentation for the methods and it is therefore also a supporting document for these standards.

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Tài liệu tham khảo

10.1680/macr.2004.56.8.453

10.1680/macr.1982.34.121.213

10.1016/S0379-7112(02)00051-6

10.1016/j.firesaf.2005.04.001

Hertz K. D. Betonkonstruktioners brandtekniske egenskaber. (Fire properties of concrete constructions) Part 1 of PhD Thesis, 1980, Institute of Building Design, now: Department of Civil Engineering, Technical University of Denmark, Lyngby, Report No. 140.

Hertz K. D. Reference list on concrete constructions exposed to high temperatures. Part 3 of PhD Thesis, 1980, Institute of Building Design, now: Department of Civil Engineering, Technical University of Denmark, Lyngby, Report No. 141.

Hertz K. D. Analyses of prestressed concrete structures exposed to fire, 1985, Institute of Building Design, now: Department of Civil Engineering, Technical University of Den-mark, Lyngby, Report 174.

CEN: ENV 1992-1-2, Design of Concrete Structures; General Rules, Structural Fire Design

Hertz K. D., 1992, ACI Materials Journal, 89, 345

Hertz K. D., 1986, ACI American Concrete Institute, Special Publication,, 92, 143

Abrams M. S., 1968, ACI American Concrete Institute, Special Publication, 25, 33

10.1680/macr.1956.8.23.85

10.1680/macr.2002.54.2.77

Persson B., 2003, Self-Compacting Concrete at Fire Temperatures

DS, 1999, Danish Code of Practice for Concrete Constructions

Hertz K. D., 2003, Documentation for Calculations of Standard Fire Resistance of Slabs and Walls of Concrete with Expanded Clay Aggregate

Jensen M. V. B., Nordic Mini-Seminar on Concrete and Fire

Mailund H. J., Larsen C. H. Styrke af brandpåvirket letbeton. (Strength of Fire Exposed Lightweight Concrete.) Diploma project, June 1991 Danish Engineering Academy, now: Department of Civil Engineering, Technical University of Denmark, Lyngby.

Harada T., 1972, ACI American Concrete Institute, Special Publication, 34, 377

Nekrasov K. D., 1969, Heat resistant concrete of Portland cement

Muff M. Brandbestandig beton basered på moler. (Fire resistant concrete based on mo-clay.) MSc Project, 1983, Institute of Building Design, now: Department of Civil Engineering, Technical University of Denmark, Lyngby.

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Magazine of Concrete Research

Tập 57 Số 8

445-453

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