Characterizing damage to a concrete liner during a tunnel fire

Hua, Nan; Tessari, Anthony; Khorasani, Negar Elhami

doi:10.1016/j.tust.2020.103761

Cited by 39 publications

(25 citation statements)

References 42 publications

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“…The corresponding quantiles for heating rate, maximum temperature, duration, and the cooling rate were also reported. The study provided spatial temperature distributions within a section and along the tunnel to serve as the first step toward damage assessment for PBD (11).…”

Section: Tunnel Fire Scenariosmentioning

confidence: 99%

Review of Tunnel Fire Damage Assessment Methods and Techniques

Hua

Khorasani

Tessari

2021

Transportation Research Record

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Major tunnel fires can have catastrophic consequences, including loss of life, property damage, and long-term service disruptions. The rapid rise of gas temperature in excess of 1,000°C (1,832°F) inside a confined tunnel space as well as long fire duration because of limited emergency responder access necessitate special design considerations when evaluating the structural response to fire. Although tunnel stability is not challenged in most cases, severe damage to the concrete lining is observed after major fire events. This paper provides a detailed review of assessment methodologies and techniques of fire damage in concrete tunnel linings, including guidance on the determination of fire scenarios, concrete spalling, and tunnel safety from existing codes and guidelines, experiments, and numerical models. Based on the review, the need to develop relevant guidelines is emphasized, the knowledge gaps in the existing research are identified, and future research directions are proposed.

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Section: Tunnel Fire Scenariosmentioning

confidence: 99%

Review of Tunnel Fire Damage Assessment Methods and Techniques

Hua

Khorasani

Tessari

2021

Transportation Research Record

Self Cite

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“…Otherwise the heat transfer between air or other gases and tunnel walls must be taken into account. Hence, studies can be found in which the walls of the tunnel are modeled as concrete partitions [7]. Among others, Hua modeled the fire damage in a tunnel structure.…”

Section: Modeling Of Tunnel Wallsmentioning

confidence: 99%

Some Tips on Numerical Modeling of Airflow and Fires in Road Tunnels

Król

2021

Energies

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The efficiency of tunnels systems is often evaluated using numerical simulations. This concerns both to normal and emergency mode of tunnel systems operation. Therefore the safety level of tunnel users may depend on the quality of numerical models being built. The most often studied areas cover the researches on natural and forced airflows in the normal mode and on fire development and smoke spreading in the emergency mode as well as modeling of fan operation. Thus, many software packages implementing Computational Fluid Dynamics (CFD) are applied here. Despite the available software is recognized as reliable, the problem arises because the built numerical models should be validated at least partially with experimental data. There is a shortage of experimental data from real tunnels due to high costs and many organizational or formal difficulties. Some researchers use data from scaled experiments, but this leads to problems connected with scaling. The paper presents the application of two widely used software packages—Fire Dynamics Simulator (FDS) and ANSYS Fluent to reproduce some scenarios of the operation of a tunnel ventilation system for normal and emergency mode. Most of results were compared with data obtained by own full scale measurements or data available in literature. Some practical issues concerning the application of FDS and ANSYS Fluent were discussed as well.

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“…Full-scale experimental tests were conducted on TBM (tunnel boring machine) tunnel linings exposed to standard high temperatures (0-600 • C), and the behavior of the concrete lining segments was analyzed [8,9]. Fire damage imparted to a tunnel liner is characterized using temperature criteria and structural response [10]. A combination of influencing factors were evaluated using static loading tests to evaluate that fire damage imparted to the tunnel linings [11].…”

Section: Introductionmentioning

confidence: 99%

Evaluation Residual Compressive Strength of Tunnel Lining Concrete Structure after Fire Damage Based on Ultrasonic Pulse Velocity and Shear-Wave Tomography

et al. 2022

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In this study, ultrasonic pulse velocity (UPV) and ultrasonic shear-wave tomography are combined to measure the residual compressive strength (RCS) of small-scale lining concrete blocks and to detect inner defects in the lining structure. The characteristics of and variations in the RCS of test blocks after being exposed to elevated temperatures (200–800 °C) and constant heating times (2 h, 3 h, and 4 h) were studied. At 800 °C, the RCS values reduced by 64.4%, 69.2%, and 74.6% at heating times of 2 h, 3 h, and 4 h. Scanning electron microscopy (SEM) was used for the micro-phase analysis of the samples that had been exposed to high temperatures. The heating time and RCS as well as the SEM micro-structure relationship were compared. Finally, a tunnel lining slab sample was designed to simulate the post-fire damage inside the blocks. Additionally, shear-wave tomography with 32 probes was able to detect the ϕ10 mm void defects at a depth of 200 mm.

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Characterizing damage to a concrete liner during a tunnel fire

Cited by 39 publications

References 42 publications

Review of Tunnel Fire Damage Assessment Methods and Techniques

Review of Tunnel Fire Damage Assessment Methods and Techniques

Some Tips on Numerical Modeling of Airflow and Fires in Road Tunnels

Evaluation Residual Compressive Strength of Tunnel Lining Concrete Structure after Fire Damage Based on Ultrasonic Pulse Velocity and Shear-Wave Tomography

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