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Heat Transfer in Ultra-High-Performance Concrete-Filled Double-Skin Tubes Under Fire Conditions

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Abstract

This paper develops an FEA modeling protocol for simulating ultra-high-performance concrete-filled double-skin tubes (CFDST) for heat transfer analysis purposes. The research presented in this paper refines the existing FE methodologies for circular, rectangular, elliptical, hexagonal, and octagonal CFDST members under fire conditions. Various modeling parameters, such as thermal properties of different materials and the thermal contact conductance at the interaction surfaces, are incorporated and controlled via an automatic algorithm for proficient modeling. It is found that the available models for calculating the thermal contact conductance at the interfaces between metal tubes and the concrete cores have a strong dependence on the cross-sectional shape. Thus, a refined model of the thermal conductance for the hexagonal and octagonal CFDST columns is proposed. Extensive experimental results (212 fire tests) are assembled from the literature to verify the proposed FE methodology. Good agreements with test results are demonstrated when predicting the temperature fields within the considered CFDST cross-sections. Consequently, extensive results from the proposed algorithm can provide an initial basis for parametric studies and for forthcoming nonlinear stress analysis simulations of CFDST columns under fire, which are primary goals in future studies. Finally, complying with the existing design codes, a new simplified analytical model based on the finite difference (FD) method is presented for predicting the temperature developments through CFDST columns.

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Data Availability

All data generated or used during the study are available in a repository online in accordance with funder data retention policies. Abdelrahman, Ahmed Hussain Ali; Ghannam, Mohamed; Lotfy, Sameh; AlHamaydeh, Mohammad. (2021). “Dataset for Temperature Development in Ultra-High-Performance Concrete-Filled Double-Skin Tubes Exposed to Fire” (Version 1.0) Zenodo. https://doi.org/10.5281/zenodo.5644692 [56]. All models and codes generated or used during the study are available from the corresponding authors upon reasonable request.

Abbreviations

CFDST:

Concrete-filled double-skin tubes

CFDT:

Concrete-filled double tubes

CFST:

Concrete-filled steel tubes

CFSST:

Concrete-filled stainless steel tubes

CFT:

Concrete-filled tube

COV:

Coefficient of variance

FD:

Finite-difference

FEA:

Finite element analysis

FE:

Finite-element

FRC:

Fiber reinforced concrete

GFRP:

Glass Fiber-Reinforced Polymers

HSC:

High-strength concrete

LWC:

Lightweight concrete

NSC:

Normal-strength concrete

UHPC:

Ultra-high-performance concrete

UHSC:

Ultra-high-strength concrete

a and b :

Constants used for the heat conductance equation

B :

Overall width of the cross-section

B o :

The overall width of the outer tube

B i :

The overall width of the inner tube

σ boltz :

Boltzmann constant = 5.67 × 10–8 W/m2K4

Cc :

Specific heat (J/kg.K)

D :

The overall diameter of the cross-section

D o :

The diameter of the outer tube in CFDST

D i :

The diameter of the inner tube in CFDST

\(f^{\prime}_{c}\) :

The cylinder compressive strength of filling concrete

Q t :

The total heat energy from convection and radiation (W/m2)

h j :

Thermal contact conductance

n :

A superscript refers to the time in second

K :

The heat conductivity (W/m·K)

L :

The length of the member

T :

The temperature (°C)

T test :

Temperature from test data

T s :

The steel surfaces temperature

T FE :

Temperature from FE

T inner :

Temperature of the inner tube

T f :

The maximum fire temperature after 120 min of fire exposure

t :

Tube thickness.

t o :

The thickness of the outer tube

t i :

The thickness of the inner tube

α c :

The convective heat transfer coefficient

ϵ m :

The emissivity coefficient

ε f :

The fire emissivity

ε s :

The steel emissivity

ρ :

Material density (kg/m3)

ρ c :

The density of concrete

χ:

Hollowness or cavity ratio

∆t :

Time interval

∆x :

The layer width (m)

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Acknowledgements

The first and second authors would like to express their gratitude to Mansoura University for providing an excellent research environment for conducting this research. The authors are grateful for financial support from the competitive research projects - research unit - Mansoura University for the project “Solar Energy Storage System Using a Medium of Sustainable Geopolymer Concrete” (MU-Eng-22-15).

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Authors and Affiliations

  1. Structural Engineering Department, Faculty of Engineering, Mansoura University, Mansoura, Egypt

    A. H. A. Abdelrahman & Mohamed Ghannam

  2. Civil Engineering Department, MISR Higher Institute for Engineering and Technology, Mansoura, Egypt

    Sameh Lotfy

  3. Department of Civil Engineering, College of Engineering, American University of Sharjah, PO Box 26666, Sharjah, United Arab Emirates

    Mohammad AlHamaydeh

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  1. A. H. A. Abdelrahman
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  2. Mohamed Ghannam
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Abdelrahman, A.H.A., Ghannam, M., Lotfy, S. et al. Heat Transfer in Ultra-High-Performance Concrete-Filled Double-Skin Tubes Under Fire Conditions. Fire Technol 59, 1519–1554 (2023). https://doi.org/10.1007/s10694-023-01386-8

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