Fire Safety Engineering Design of Structures

Purkiss, J. A.

doi:10.1201/b16059

Cited by 71 publications

(36 citation statements)

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“…The effect of not including transient creep strain in a full stress-strain model can be shown to produce erroneous unsafe results for the behavior of columns heated in three sides, thus inducing a thermal moment, in fire [9], although the effect may be exacerbated due to the coexistence of thermal and moment gradient. However, the necessity of taking transient creep into account by an explicit term in the strain decomposition has been questioned [10] because the current Eurocode 2 model, which is an implicit model, has proved for many years to yield quite satisfactory results when modelling experimental tests made on concrete structural elements in fire.…”

Section: Transient Creep Strainmentioning

confidence: 97%

Effect of Transient Creep Strain Model on the Behavior of Concrete Columns Subjected to Heating and Cooling

Gernay

2011

Fire Technol

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In the numerical analysis of structures in fire, the material models that are used have important implications on the global behavior of the structure. In concrete, a particular phenomenon appears when subjected to high temperatures: the transient creep strain. Models integrating explicitly a term for transient creep strain have been proposed in the literature but, in the current Eurocode 2 model, there is no explicit term for transient creep strain. This phenomenon is included in the Eurocode 2 model, but it is implicitly considered in the mechanical strain term. A series of experimental fire tests on axially restrained concrete columns subjected to heating and cooling has been recently performed at South China University of Technology and described by Wu et al. ). In the original paper, it was shown that using the implicit model of Eurocode 2, the behavior of the columns cannot be simulated properly, especially during the cooling phase. The objective of the present paper is to perform again the fire tests simulations using a new formulation of the Eurocode 2 model that contains an explicit term for transient creep. In the first part of the paper, the explicit formulation of the Eurocode 2 model is presented. In the second part, the fire tests are modeled with the software SAFIR using, on the one hand, the implicit Eurocode model and, on the other hand, the new explicit model. It is shown that the transient creep model has significant implications on the global behavior of structural concrete members, as the residual axial load sustained by the columns at the end of the fire can differ by up to 25% of the initial applied load depending on the transient creep strain model that is used for the calculation. The experimental behavior is better matched with the new explicit model than with the current Eurocode model. Particularly, the results given by the Eurocode model during the cooling phase are unconservative as the residual axial load is overestimated. Finally, it is explained why, on the basis of an example, in a performance-based approach, these results can have important implications on the global fire resistance of a structure.

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Section: Transient Creep Strainmentioning

confidence: 97%

Effect of Transient Creep Strain Model on the Behavior of Concrete Columns Subjected to Heating and Cooling

Gernay

2011

Fire Technol

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“…The similar fire tests undertaken in different countries may have significant variations in fire resistance rating [23]. Therefore, specimen 1 was used to compare with other specimens with similar configurations from literature [4,12,14].…”

Section: Comparison Of Fire Resistance Time With Other Existing Similmentioning

confidence: 99%

Full-scale fire experiments on load-bearing cold-formed steel walls lined with different panels

Chen

Bai

et al. 2012

Journal of Constructional Steel Research

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“…Heat fluxes flow to the bottom and two side surfaces of RC beams and exchange heat with them through convection and radiation, whereas heat transmission occurs within concrete through conduction. The time-dependent temperature distribution in an RC beam is described by Fourier's differential equation for heat conduction (Purkiss 2007): (16) where k, ρ and c denote the temperature-dependent thermal conductivity, density and specific heat capacity, respectively; Q is the rate of heat generated internally per unit volume; and t is the time variable. For heat transfer analysis of an RC beam exposed to fire, internal heat generation is inactive (i.e., Q = 0) (fib 2007).…”

Section: Fe Analysismentioning

confidence: 99%

Self-Stressed Steel Fiber Reinforced Concrete as Negative Moment Connection for Strengthening of Multi-Span Simply-Supported Girder Bridges

Wang

Dai

2013

Advances in Structural Engineering

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A self-stressed steel fiber reinforced concrete (SS-SFRC) moment connection is proposed to strengthen multi-span simply-supported T-section reinforced concrete (RC) girders. In the proposed moment connection technique, old concrete needs to be removed from adjacent girder ends and negative moment reinforcement is placed into cast-in-place SS-SFRC to develop continuity over the interior support. Two series of tests consisting of 15 girder specimens were conducted to investigate the reliability of the proposed SS-SFRC moment connection. An analytical model is presented to predict the load-carrying capacity of the resulting continuous composite girders. Test results show that SS-SFRC is excellent in preventing concrete cracking at the interior support. Both the load-carrying capacity and the serviceability of the strengthened girders are significantly improved. The analytical model is demonstrated to predict the load-carrying capacity of the resulting continuous composited girders with an acceptable degree of accuracy.

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Fire Safety Engineering Design of Structures

Cited by 71 publications

References 0 publications

Effect of Transient Creep Strain Model on the Behavior of Concrete Columns Subjected to Heating and Cooling

Effect of Transient Creep Strain Model on the Behavior of Concrete Columns Subjected to Heating and Cooling

Full-scale fire experiments on load-bearing cold-formed steel walls lined with different panels

Self-Stressed Steel Fiber Reinforced Concrete as Negative Moment Connection for Strengthening of Multi-Span Simply-Supported Girder Bridges

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