Uniaxial Model for Concrete under Variable Temperature and Stress

Khennane, Amar; Baker, G. P.

doi:10.1061/(asce)0733-9399(1993)119:8(1507)

Cited by 52 publications

(31 citation statements)

References 10 publications

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“…However, a study on the residual mechanical properties of normal strength concrete with siliceous aggregate shows that Eurocode4 (2005) provides higher values for the residual peak strain than that of the test data by Chang et al (2006). This indicates that higher peak strains are estimated for concrete at the maximum temperature T than that after having cooled down to 20 o C. For stressed concrete, which is commonly the condition of concrete in columns, temperatures appear to have less effect on the peak compressive strain than it does for the unstressed concrete (Khennane and Baker, 1992). Youssef and Moftah (2007) studied different models for peak strain of concrete at elevated temperatures and concluded that Khennane and Baker (1992), Eq.…”

Section: Mechanical Properties Of Fire-damaged Concretementioning

confidence: 68%

Seismic Resistance of Fire-Damaged Reinforced Concrete Columns

Mostafaei

Vecchio

Bénichou

2009

Improving the Seismic Performance of Existing Buildings and Other Structures

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The material in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission. For more information visit http://laws.justice.gc.ca/en/showtdm/cs/C-42Les renseignements dans ce document sont protégés par la Loi sur le droit d'auteur, par les lois, les politiques et les règlements du Canada et des accords internationaux. Ces dispositions permettent d'identifier la source de l'information et, dans certains cas, d'interdire la copie de documents sans permission écrite. Pour obtenir de plus amples renseignements : http://lois.justice.gc.ca/fr/showtdm/cs/C-42 ABSTRACTA study was carried out on the assessment of the residual strength and lateral/seismic load capacity of reinforced concrete columns after fire exposure. The mechanical properties of concrete after fire exposure, such as residual tension and compression strength, stiffness and constitutive responses, were reviewed. A nonlinear finite element analysis program, developed for three-dimensional reinforced concrete structures, was employed to estimate the post-fire axial and lateral performance of two full-scale reinforced concrete columns, tested previously at the National Research Council Canada. The results of the axial load-deformation response obtained from the analysis were compared and verified successfully with the test data. The lateral load and deformation responses of the specimens were then estimated using the numerical program. The results showed that both the lateral/seismic load capacity and ductility of the two reinforced concrete column specimens decreased noticeably due to the fire exposure. Studies are suggested on fire damage mitigation and post-fire shear strength recovery of reinforced concrete columns.

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Section: Mechanical Properties Of Fire-damaged Concretementioning

confidence: 68%

Seismic Resistance of Fire-Damaged Reinforced Concrete Columns

Mostafaei

Vecchio

Bénichou

2009

Improving the Seismic Performance of Existing Buildings and Other Structures

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“…The most important models for the peak strain of prestressed concrete at high temperatures are those proposed by Khennane and Baker (1993) and Terro (1998). Khennane and Baker (1993) studied the experimental results provided by Anderberg and Thelandersson (1976) and proposed the following equation for the peak strain of concrete having an initial compressive stress during heating process…”

Section: Prestressed Elastic Modulus Of Concrete At Elevated Temperatmentioning

confidence: 99%

“…Khennane and Baker (1993) studied the experimental results provided by Anderberg and Thelandersson (1976) and proposed the following equation for the peak strain of concrete having an initial compressive stress during heating process…”

Section: Prestressed Elastic Modulus Of Concrete At Elevated Temperatmentioning

confidence: 99%

“…Khennane and Baker (1993) Preloaded Anderberg and Thelandersson (1976) Schnelder (1986) Khennane and Baker (1993) Proposed model …”

Section: Prestressed Elastic Modulus Of Concrete At Elevated Temperatmentioning

confidence: 99%

“…Figure 4 provides a comparison of the proposed relationship, the models of Khennane and Baker (1993) and Terro (1998) and the experimental results of Anderberg and Thelandersson (1976). Compared with the peak strain under high temperature, the peak strain of concrete after a high temperature is slightly larger.…”

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Prestressed concrete thermal behaviour

Aslani

2013

Magazine of Concrete Research

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The structural fire safety capacity of concrete is very complicated because concrete materials have considerable variations. Constitutive relationships for prestressed normal-strength concrete (NSC) and high-strength concrete (HSC) subjected to fire are needed to provide efficient modelling and to meet specific fire-performance criteria of the behaviour for prestressed concrete structures exposed to fire. In this paper, formulations for estimating the parameters affecting the behaviour of unconfined prestressed concrete at high temperatures are proposed. These formulations include residual compression strength, initial modulus of elasticity, peak strain, thermal strain, transient creep strain and the compressive stress-strain relationship at elevated temperatures. The proposed constitutive relationships are verified with available experimental data and existing models. The proposed relationships are general and rational, and show good agreement with the experimental data. More tests are needed to further verify and improve the proposed constitutive relationships.

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Gradient enhanced thermo‐mechanical damage model for concrete at high temperatures including transient thermal creep

Pearce

Nielsen

Bícanić

2004

Num Anal Meth Geomechanics

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SUMMARYA thermo-mechanical model for concrete under transient high temperatures is presented. Particular emphasis is placed on the transient thermal creep model, which can be seen as an extension of Thelandersson's formulation, and the gradient-enhanced damage model that has been extended here to include temperature dependency. Degradation of the material stiffness due to exposure to elevated temperatures is included via a simple thermal damage model. The model's performance is illustrated on several benchmark problems under both transient and steady state heating conditions.

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Uniaxial Model for Concrete under Variable Temperature and Stress

Cited by 52 publications

References 10 publications

Seismic Resistance of Fire-Damaged Reinforced Concrete Columns

Seismic Resistance of Fire-Damaged Reinforced Concrete Columns

Prestressed concrete thermal behaviour

Gradient enhanced thermo‐mechanical damage model for concrete at high temperatures including transient thermal creep

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