Simplified fire design for composite hollow-section columns

Aribert, Jean-Marie; Renaud, Christophe; Zhao, Bin

doi:10.1680/stbu.2008.161.6.325

Cited by 34 publications

(53 citation statements)

References 3 publications

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“…In addition, analytical formulas for assessing loadbearing capacity have been developed for beams and columns with thermal gradients [15, 44 -50], for composite elements such as concrete filled hollow steel section or I-column or beam sections with concrete between the flanges [16,51] and also for beam-column connections [89]. On the other hand, an analytical calculation method was developed for structural elements located outside the burning building and subjected to heat coming from external flames passing through windows [15,16,52].…”

Section: (B) Analytical Formulasmentioning

confidence: 99%

International R and D Roadmap for Fire Resistance of Structures Summary of NIST/CIB Workshop

Yang¹,

Bundy²,

Gross³

et al. 2015

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This report summarizes the results of the global meeting to develop the International R&D Roadmap for Fire Resistance of Structures (the Roadmap) held May 21-22, 2014, in Gaithersburg, Maryland. The workshop was sponsored by the National Institute of Standards and Technology (NIST) and the International Council for Research and Innovation in Building and Construction (CIB) and hosted by NIST. The workshop provided a forum to identify and discuss the research and development needs and programs to implement to advance technical solutions in order to improve the fire resistance of structures through greater use of existing technologies, development and deployment of emerging technologies, and development and implementation of standards and codes for performance-based engineering design. In preparation for the workshop, NIST commissioned three white papers-one on concrete structures, one on steel structures, and one on timber structures-written by topic experts in the respective fields.

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Section: (B) Analytical Formulasmentioning

confidence: 99%

International R and D Roadmap for Fire Resistance of Structures Summary of NIST/CIB Workshop

Yang¹,

Bundy²,

Gross³

et al. 2015

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“…Refs. [3,7]). Typically, the steel tube is assumed to have uniform temperature and the concrete cross-section is divided into ringed segments of equal thickness.…”

Section: Eurocode 4 Annex H Approach [4]mentioning

confidence: 99%

“…2, where six concrete layers have been chosen. Clearly, the more layers that are taken the more refined the prediction, however between five [7] and ten [3] layers have been suggested in the literature; in the current analysis seven layers were assumed. Each of the concrete rings is assumed to have a uniform temperature at any given instant time, with temperatures based on the heat transfer analysis described previously.…”

Section: Eurocode 4 Annex H Approach [4]mentioning

confidence: 99%

“…The situation in a square section is more complicated; in a square section the temperature at the corners is higher than at the middle of the flat faces. However precedence exists [7] to assume an equivalent uniform temperature in each concrete layer in the square section, provided that the uniform temperature chosen for the layer leads to the same (or smaller) contribution to either the plastic resistance in compression or the cross-section"s flexural stiffness as would a more complete summation of a 2-D grid of concrete elements. A heat transfer analysis was therefore performed (using ABAQUS) for the square sections assuming a 2-D square element mesh and the average temperature in each element was determined.…”

Section: Eurocode 4 Annex H Approach [4]mentioning

confidence: 99%

“…Structural fire design guidance is available [1,[3][4][5][6][7][8] for many types of CFS columns. However, much of the available fire resistance design guidance was developed for conventional applications based predominantly on outdated large-scale standard fire tests of short, concentrically loaded, small-diameter columns envisioned for use in braced frames using normal strength concrete (compressive strength of 40MPa or less).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fire Resistance Design of Unprotected Concrete Filled Steel Hollow Sections: Meta-Analysis of Available Furnace Test Data

Rush¹,

Bisby²,

Melandinos³

et al. 2011

Fire Safety Science - Proceedings of the 10th International Sym

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Concrete filled steel hollow structural sections are an efficient, sustainable, and attractive option for both ambient temperature and fire resistance design of columns in multi-storey buildings and are increasingly common in modern construction practice around the world. Whilst the design of these sections at ambient temperatures is reasonably well understood, and models to predict the strength and failure modes of these elements correlate well with observations from tests, this appears not to be true in the case of fire resistant design. This paper assesses the statistical confidence in available fire resistance design models/approaches that are used in North America and Europe by performing a meta-analysis which compares the available experimental data from large-scale standard fire tests performed around the world against fire resistance predictions from design codes. It is shown that available design approaches carry a large uncertainty of prediction, suggesting that they fail to properly account for fundamental aspects of the underlying mechanics during fire. Current North American design approaches for CFS columns are shown to be considerably less conservative, on average, than those used in Europe.

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10.14: Fire design method for eccentrically loaded concrete‐filled steel tubular columns based on interaction diagrams

et al. 2017

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In this paper, a simplified design method for evaluating the fire resistance of eccentrically loaded concrete filled steel tubular (CFST) columns is presented. The developed method is based on the results of an extensive parametric analysis conducted in the framework of the RFCS European Project FRISCC (Fire resistance of innovative and slender concrete filled tubular composite columns) and is currently being evaluated by the Working Group SC4.T4 for its approval as the method to replace the current Annex H in EN1994-1-2, which was proved in previous investigations to be unsafe for slender columns. The method presented in this paper is based on the provisions of Clause 6.7.3.6 of EN 1994-1-1 for room temperature design, using bending momentaxial force interaction curves specially built up for the fire situation. These interaction curves are obtained by considering several possible positions of the plastic neutral axis within the cross-section, and determining the internal forces and moments from the plastic stress blocks, which results particularly challenging for CFST sections subjected to elevated temperatures, given the thermal gradient that occurs within the cross-section. For simplifying this process, equivalent temperatures are proposed, which allow using a single uniform temperature for representing each part of the composite section. Appropriate coefficients are also proposed for evaluating the effective flexural stiffness for second-order analysis at elevated temperatures. The influence of the cross-section shape, load eccentricity and percentage of reinforcement is accounted for in the proposal.

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Simplified fire design for composite hollow-section columns

Cited by 34 publications

References 3 publications

International R and D Roadmap for Fire Resistance of Structures Summary of NIST/CIB Workshop

International R and D Roadmap for Fire Resistance of Structures Summary of NIST/CIB Workshop

Fire Resistance Design of Unprotected Concrete Filled Steel Hollow Sections: Meta-Analysis of Available Furnace Test Data

10.14: Fire design method for eccentrically loaded concrete‐filled steel tubular columns based on interaction diagrams

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