A Concrete Model Considering The Load History Applied To Centrally Loaded Columns Under Fire Attack

Schneider, Ulrich; Morita, Takeshi; Franssen, Jean‐Marc

doi:10.3801/iafss.fss.4-1101

Cited by 10 publications

(6 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This generic behaviour was initially proposed by Schneider [17] and has been approved by a draft committee of RILEM experts. This generic behaviour of concrete material agrees well with the actual stress-strain curves of concrete at elevated temperatures [17,18,[22][23][24][25]. Also, it has been demonstrated to capture quite satisfactorily experimental results during the heating phase and thus has been generally accepted by authorities and regulators [13,26].…”

Section: The S-e M-t Relation Of Concretesupporting

confidence: 77%

Stress–strain–temperature relationship for concrete

Torero

Dao

2021

Fire Safety Journal

View full text Add to dashboard Cite

When concrete structures are subjected to load and temperature simultaneously, it is essential to take into account the coupled effects between stress and expansion. However, due to incomplete understanding, such coupled effects have only been incorporated into current Eurocode 2 (EC2) stress-strain curves by means of empirical correlations. These empirical correlations at different target temperatures are presented in tables that do not allow to clearly identify the correlation chosen to obtain the specific values. A further limitation of these tables is that the relationships cannot be used to evaluate the performance of concrete structures during the cooling phase. In this paper, a physically-based model of the coupled effects between stress and expansion is used to define the strain corresponding to the compressive strength, and thus to develop a simple formulation for stress-strain-temperature relationship of concrete. The results are then compared with the EC2 stress-strain-temperature table. The expression of stress-strain-temperature relationship developed in this paper successfully agrees with the stress-strain curves of concrete in EC2 used for the heating phase. More importantly, the proposed stress-strain-temperature relationship can also be applicable for design purposes of concrete structures during the cooling phase.

show abstract

Section: The S-e M-t Relation Of Concretesupporting

confidence: 77%

Stress–strain–temperature relationship for concrete

Torero

Dao

2021

Fire Safety Journal

View full text Add to dashboard Cite

show abstract

“…, T tr is called "thermal induced creep strain" but the definition is different compared to [8]. The pure transient creep will not be calculated numerically within the proposed calculation procedure described above, but the exact extended relationship is given in equation 7.…”

Section: ( )mentioning

confidence: 99%

Experimental Study of the Advanced Transient Concrete Model on Reinforced Concrete Columns During Fire Exposure

Schneider¹,

Schneider²

2010

TOBCTJ

View full text Add to dashboard Cite

The advanced transient concrete model (ATCM) is an extended model for concrete in compression at elevated temperature that incorporates elastic, plastic and creep strain as a function of temperature and stress history. The ATCM is applied with the material model of the thermal induced strain model. The non-linear model comprises thermal strain, elastic strain, plastic strain and transient temperature strains and load history modelling of restraint concrete structures subjected to fire. The mechanical strain calculated as a function of elastic strain, plastic strain and thermal induced strain. The thermal induced strain is relative independent compared to dependence of Young's Modulus by load history. Actually the term comprises elastic, plastic and (pure) transient creep strains as we will show. A comparison is given between experimental results with cylindrical specimens and calculated results. The equations of the ATCM consider a lot of capabilities, especially for considering irreversible effects of temperature on some material properties. By considering the load history during heating up, an increasing load bearing capacity due to a higher stiffness of concrete may be obtained. With this model it is possible to apply the thermal-physical behaviour of material laws for calculation of structures under extreme temperature conditions. The effect of load history in highly loaded structures under fire load will be investigated. The theoretical basis is given in this supplement added with an experimental study of concrete columns with various mixes.

show abstract

“…The mechanical analysis is based on these results. There are numerous models available for determining the behavior of ordinary concrete at high temperatures [9,10,11]. In regard to this, there is also high dependency on the type of concrete, used as studies for ultra-high performance concrete have shown (UHPC) [12,13].…”

Section: Introductionmentioning

confidence: 99%

Calculation of a Tunnel Cross Section Subjected to Fire – with a New Advanced Transient Concrete Model for Reinforced Structures

Schneider¹,

Schneider²,

Franssen³

2009

Acta Polytech

Self Cite

View full text Add to dashboard Cite

The paper presents the structural application of a new thermal induced strain model for concrete – the TIS-Model. An advanced transient concrete model (ATCM) is applied with the material model of the TIS-Model. The non-linear model comprises thermal strain, elastic strain, plastic strain and transient temperature strains, and load history modelling of restraint concrete structures subjected to fire.The calculations by finite element analysis (FEA) were done using the SAFIR structural code. The FEA software was basically new with respect to the material modelling derived to use the new TIS-Model (as a transient model considers thermal induced strain). The equations of the ATCM consider a lot of capabilities, especially for considering irreversible effects of temperature on some material properties. By considering the load history during heating up, increasing load bearing capacity may be obtained due to higher stiffness of the concrete. With this model, it is possible to apply the thermal-physical behaviour of material laws for calculation of structures under extreme temperature conditions.A tunnel cross section designed and built by the cut and cover method is calculated with a tunnel fire curve. The results are compared with the results of a calculation with the model of the Eurocode 2 (EC2-Model). The effect of load history in highly loaded structures under fire load will be investigated.A comparison of this model with the ordinary calculation system of Eurocode 2 (EC2) shows that a better evaluation of the safety level was achieved with the new model. This opens a space for optimizing concrete structure design with transient temperature conditions up to 1000 °C.

show abstract

A Concrete Model Considering The Load History Applied To Centrally Loaded Columns Under Fire Attack

Cited by 10 publications

References 4 publications

Stress–strain–temperature relationship for concrete

Stress–strain–temperature relationship for concrete

Experimental Study of the Advanced Transient Concrete Model on Reinforced Concrete Columns During Fire Exposure

Calculation of a Tunnel Cross Section Subjected to Fire – with a New Advanced Transient Concrete Model for Reinforced Structures

Contact Info

Product

Resources

About