Article
Engineering, Civil
Rahul Kallada Janardhan, Saani Shakil, Wei Lu, Simo Hostikka, Jari Puttonen
Summary: This paper presents a unidirectional coupling methodology for combining fire simulation with finite element analysis to study the response of long-span steel truss beams exposed to non-uniform temperature distributions. Experimental studies and fire simulations were conducted to analyze the impact of fire spread on the beams and the various responses of the beams in non-uniform temperature fields.
ENGINEERING STRUCTURES
(2022)
Article
Thermodynamics
Gabriele Vigne, Wojciech Wegrzynski, Alexis Cantizano, Pablo Ayala, Guillermo Rein, Candido Gutierrez-Montes
Summary: Fires in large-volume buildings present unique challenges, especially regarding smoke control for life safety. This study conducted experimental and numerical research on smoke dynamics from multiple fire sources, showing worse conditions compared to single fires. The findings highlight the importance of considering fires with multiple sources due to quicker smoke production.
BUILDING SIMULATION
(2021)
Article
Thermodynamics
Rafat Al-Waked, Mohammad Nasif, Nathan Groenhout, Lester Partridge
Summary: The study assessed the performance of a residential block with an Atrium using CFD simulations for natural ventilation and fire scenarios. Results showed the importance of ambient conditions for natural ventilation and recommended using operable louvres based on outdoor temperature. Location of fire within the Atrium was found to significantly impact air quality and ventilation strategy.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Review
Engineering, Civil
Aatif Ali Khan, Asif Usmani, Jose Luis Torero
Summary: This paper examines the current state of defining gas temperatures for structural fire analysis, reviews widely adopted fire models used in structural analysis, discusses the limitations and scope of applicability of the most commonly used fire models.
FIRE SAFETY JOURNAL
(2021)
Article
Computer Science, Interdisciplinary Applications
Xu Dai, Antonio Gamba, Chang Liu, Johan Anderson, Marion Charlier, David Rush, Stephen Welch
Summary: This study investigates the temperature heterogeneity in large open-plan office compartments caused by fire, as well as the ability of Computational Fluid Dynamics (CFD) models to reproduce fire spread behavior over timber cribs. The results show that fire spread is highly sensitive to various parameters and linear relationships exist between different fire modes and thermal exposures.
ADVANCES IN ENGINEERING SOFTWARE
(2022)
Article
Engineering, Chemical
James R. Stewart, Herodotos N. Phylaktou, Gordon E. Andrews, Alan D. Burns
Summary: This paper evaluated the Fire Dynamics Simulator (FDS) for predictive modeling of liquid pool fire burning rates, showing consistent model performance for fully predictive modeling during quasi-steady burning. However, the model falls short in predicting the subtleties associated with each phase of the transient burning process, failing to reliably predict fuel mass loss rates during fire growth and extinction. The results suggest a range of model modifications for improved prediction of the transient fire growth and extinction phases of burning for liquid pool fires.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2021)
Article
Engineering, Multidisciplinary
Virginie Drean, Bertrand Girardin, Roman Chiva, Eric Guillaume, Talal Fateh
Summary: This paper evaluates the fire performance of a specific facade system using large-scale testing and discusses the fire test protocol detailed in BS 8414 series. The numerical model of the BS 8414 facility is validated based on experiments, and the influence of external factors on the thermal exposure of the facade is investigated.
Article
Thermodynamics
Hossein Hadi Najafabadi, Vinod Suresh, Callum James Thomas Spence, Eu-Lee Teh, John Edward Cater
Summary: The study utilized a numerical model and experimental data to investigate the generation and behavior of surgical smoke during laparoscopic surgery, showing that the smoke is mainly composed of water vapor, particulate matter, and volatile substances, with specific generation rates also measured.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Multidisciplinary
Rahul Kallada Janardhan, Saani Shakil, Marko Hassinen, Wei Lu, Jari Puttonen, Simo Hostikka
Summary: The feasibility of using coupled CFD and FE simulations to aid firefighting tactics and structural cooling was investigated. Experimental and simulation results showed that spray cooling can reduce temperatures and halt truss deformation.
Article
Construction & Building Technology
Zhi Liu, Guo-Qiang Li
Summary: Over the past decade, significant progress has been made in understanding the fire performance of bridges. However, there is still a lack of studies on the safety evaluation of steel cable-stayed bridges subjected to ship fires. This study developed an advanced numerical method to accurately evaluate the response of steel cable-stayed bridges to ship fires. The proposed method was validated and it was found that fires can introduce local damage to the bridge and alter its internal force distribution.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2023)
Article
Thermodynamics
Diego Alvarez-Coedo, Pablo Ayala, Alexis Cantizano, Wojciech Wegrzynski
Summary: This paper presents the validation of a coupled hybrid (1D/3D-CFD) modelling methodology for tunnel fires, and compares the results with full-scale fire tests. The study shows that the proposed methodology accurately predicts temperature profiles and backlayering lengths, reducing computational cost compared to a full-CFD numerical model.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Construction & Building Technology
Pengzhen Lu, Qingtian Shi, Kai Ye, Ying Wu, Libo Lu, Yutao Zhou
Summary: This paper proposes a modified finite-element model (FEM) of a bridge following a fire based on the fire dynamics simulator (FDS)-artificial intelligence algorithm. The static behavior of the bridge is predicted using the updated model, which is obtained through numerical simulation and dynamic load test results.
STRUCTURAL CONCRETE
(2023)
Article
Engineering, Civil
N. Verma, S. Hostikka, J. Vaari, T. Korhonen
Summary: Nuclear power plants face a significant risk from cable fires, which can cause cable failures and spread to other equipment, jeopardizing their safe operation. This paper presents a computational fluid dynamics-based method to model the heat release rate of cable fires, and the results show promising accuracy.
FIRE SAFETY JOURNAL
(2023)
Article
Engineering, Chemical
Yi-Hao Huang
Summary: This study reconstructed and analyzed a fire incident in a long-term care facility in Taiwan using computational fluid dynamics and the Fire Dynamics Simulator software tool. The study found that if partition walls were not fully connected or lacked fire protection stuffing, smoke would spread through these channels, with the assistance of the self-contained air-conditioning units. Thick smoke entered rooms from above the decorative ceiling and was absorbed by the air-conditioning units before being channeled to other rooms, making evacuation challenging. Based on the analysis of the fire and smoke flow, the study recommended an emergency egress time of 179 seconds after fire occurrence.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2022)
Article
Computer Science, Interdisciplinary Applications
Mario Miguel Valero, Lluis Jofre, Ricardo Torres
Summary: Predictions of wildfire behavior are often uncertain, with modeling uncertainties largely unquantified in the literature due to computing constraints. However, new multifidelity techniques show promise in overcoming these limitations, as demonstrated in this study's exploration of their applicability to wildland fire spread prediction. The study achieved notable speedups in performance compared to standard methods, allowing for the quantification of uncertainties and sensitivity analysis in a cost-effective manner.
ENVIRONMENTAL MODELLING & SOFTWARE
(2021)
Article
Construction & Building Technology
Davide Leonetti, Johan Maljaars, Giacomo Pasquarelli, Giuseppe Brando
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2020)
Article
Construction & Building Technology
Davide Leonetti, H. H. (Bert) Snijder, Johan Maljaars
Summary: This study applies probabilistic fatigue life prediction models to estimate the safety level of a non-load carrying cruciform joint. Results demonstrate that a 0.5 to 1 increase in the reliability index can be achieved by applying a more complex model.
STRUCTURAL ENGINEERING INTERNATIONAL
(2021)
Article
Engineering, Multidisciplinary
Richard Dekker, Frans P. van der Meer, Johan Maljaars, Lambertus J. Sluys
Summary: The numerical model integrates various techniques such as the level set method, segmentation of solid and pit domains, and atomic diffusion to study the growth of corrosion pits under mechanical and electrochemical loading. The results show that plastic deformation and cyclic frequency have a significant impact on the pit growth rate under different loading conditions, while mechanical loading under diffusion control has little influence on the growth rate.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2021)
Article
Automation & Control Systems
Roy Cornelissen, Johan Maljaars, Herm Hofmeyer
Summary: This paper investigates the prediction of wrinkling in hollow sections during the three-point-roll bending process. It is shown that buckling of the compressed plate part at the inner radius is the most important condition for wrinkling to occur, and an analytical prediction model for buckling is presented, which is validated with a finite element model and experiment. The results confirm that wrinkling does not occur if the applied radius exceeds the model predicted critical radius.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Mechanics
Davide Leonetti, Johan Maljaars, H. H. (Bert) Snijder
Summary: Propagation of weld toe cracks under cyclic loading is often predicted using fracture mechanics, with studies aiming to correlate fatigue crack growth rate and threshold condition of small cracks. This paper bypasses the difficulties in quantifying material properties and model parameters by using the square root of area parameter, formulating a linear elastic fracture mechanics based fatigue crack growth model.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Mechanics
Iris Luijters, Johan Maljaars, Simon Wijte
Summary: This study indicates that embedding steel reinforcement bars in concrete does not significantly improve fatigue performance compared to bars in air. Factors such as crack location, distance between concrete cracks, and mechanical interlock have little impact on rebar stress peaks and therefore on rebar fatigue performance. No significant difference in fatigue resistance should be expected between rebars in air and rebars embedded in concrete. Variations in local geometry appear to have a more significant influence on fatigue performance.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Mechanics
R. Dekker, F. P. van der Meer, J. Maljaars, L. J. Sluys
Summary: This study presents the calibration and validation of a cohesive extended finite element model for fatigue crack propagation in ductile materials, showing that the model can accurately capture the behavior of fatigue crack growth under different loading conditions in ductile materials. The approach separates plasticity around the crack tip and fatigue crack growth, predicting the influence of plasticity on fatigue driving forces and requiring effective Paris parameters for characterizing crack growth.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Construction & Building Technology
Johan Maljaars, Thomas Misiek
Summary: Many steel rope systems are prone to fatigue failure due to fluctuating tensile loads. Full-locked coil ropes exhibit slightly lower fatigue resistance compared to other types of ropes. Test data on full-locked coil ropes have been extrapolated using a semi-empirical model to revise the European standard prEN 1993-1-11.
STEEL CONSTRUCTION-DESIGN AND RESEARCH
(2021)
Article
Construction & Building Technology
Johan Maljaars, Thomas Misiek
Summary: Many steel rope systems can fail due to fatigue from fluctuating tensile loads. Factors like rope diameter, mean stress, socket type, lay angle, and rope length influence fatigue resistance. Probabilistic analysis shows that required structural reliability levels can be met by considering full rope fracture as the end-of-life criterion.
STEEL CONSTRUCTION-DESIGN AND RESEARCH
(2021)
Article
Mechanics
Johan Maljaars, Arpad Rozsas, Carey L. Walters, Henk Slot
Summary: This paper quantifies the model uncertainty of the failure assessment line (FAL) provided in BS 7910:2019 by comparing it with the actual failure load. The results suggest that considering crack tip constraint improves the assessment accuracy, but there are still cases where the predicted failure load is lower than the actual load. Therefore, it is advocated to add a penalty or safety margin to the FAL for compensation.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Civil
Johan Maljaars, Davide Leonetti, Bahman Hashemi, H. H. (Bert) Snijder
Summary: This paper presents a probabilistic framework for deriving the safety factors for fatigue of steel and composite steel concrete road bridges. Uncertainties in engineering models and dynamic amplification factors are established through comparison of measurements and models. The study shows that the currently recommended safety factors for fatigue by Eurocodes need to be raised.
Article
Engineering, Civil
Stefan Verdenius, Sjoerd Hengeveld, Johan Maljaars
Summary: Train axle load measurements between 2012 and 2019 at 87 locations in the Dutch railway network are used to evaluate fatigue of railway bridges. The theoretical fatigue damage is calculated for the measured loads and the load model from Eurocode EN 1991-2 Annex D. Results show that the Eurocode load model is (very) conservative for most cases, but unconservative for a few cases. Large differences in fatigue relevant loads are observed between different tracks. Alternative load models are proposed based on track-specific traffic characteristics, and uncertainties are quantified and safety factors are established.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Civil
Jorrit D. Rodenburg, Johan Maljaars, Sjoerd T. Hengeveld, Adri H. J. M. Vervuurt
Summary: This paper proposes a new and more realistic model for the contact surface of tyres, in order to meet the requirements of fatigue loads in road bridges.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Civil
Mahmoud Trimech, Charles Darwin Annan, Scott Walbridge, Johan Maljaars
Summary: This paper presents experimental and numerical investigation of fatigue behavior of butt-lap friction stir welded (FSW) joints in highway bridge decks made from aluminum extrusions. A large-scale fatigue experiment was conducted to analyze the fatigue failure mode and derive the S-N curve for fatigue-sensitive details. The IIW design ENS IIW FAT-71 curve for fusion-welded joints is found to be conservative in assessing the fatigue behavior of FSW joints.
Article
Engineering, Mechanical
Johan Maljaars, Richard Pijpers, Weijian Wu, Henk Kolstein
Summary: This study determines the fatigue resistance of welded details in orthotropic decks using structural stress and fracture mechanics simulations. High fatigue resistances are observed due to favorable loading modes and reduced driving force with crack growth. The technical specification TS 1993-1-901, part of the new generation of Eurocodes, is based on the findings of this study.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Civil
Tarek Beji, Bouaza Lafdal, Rabah Mehaddi
Summary: The paper presents experimental measurements of transient profiles of burning rates and liquid temperatures in methanol and heptane pool fires. The results suggest significant enhancement in heat transfer due to convective motion within the liquid. Additionally, a two-zone approach for the thermal structure within the liquid has been proposed and will be implemented in a numerical code.
FIRE SAFETY JOURNAL
(2024)
Article
Engineering, Civil
Walter Klein-Hessling
Summary: Fire simulations and analytical validation approaches are becoming increasingly important in the fire safety assessment of nuclear power plants. The COCOSYS code has been improved to better simulate cable fires and has been validated through experiments. It provides a set of input parameters for different ventilation conditions.
FIRE SAFETY JOURNAL
(2024)
Article
Engineering, Civil
Bing Wu, Yu Meng, Yongzheng Yao, Baiwei Lei, Jingxin Wang, Junjie Zhai
Summary: Underground laneway fires have a throttling effect on ventilation systems and the amount of CO produced by combustion is significantly influenced by ventilation conditions.
FIRE SAFETY JOURNAL
(2024)
Article
Engineering, Civil
Ahmad Hassan, Gilbert Accary, Duncan Sutherland, Khalid Moinuddin
Summary: Numerical simulations were conducted to study laboratory-scale junction fires with a shrub fuel bed under different unidirectional wind conditions on various terrain slopes and junction angles. The results showed that the decrease in junction angle enhanced fire spread, and the impact of wind speed on fire behavior depended on the intermediate values of the junction angle. The driving heat transfer mode in junction fires varied based on the presence of wind and slope conditions.
FIRE SAFETY JOURNAL
(2024)
Article
Engineering, Civil
Samuel Vaux, Emeline Georges, Hugues Pretrel
Summary: This study investigates an elevated pool fire scenario in a confined and forced ventilated compartment through both experimental and numerical methods. The objective is to enhance the understanding of the phenomena and evaluate the Computational Fluid Dynamics (CFD) capabilities in this configuration. The comparison between large-scale fire tests and numerical simulations reveals differences in fuel mass loss rate and thermal stratifications between elevated and ground fires. The study also highlights the limitations of the predictive approach commonly used for ground fires when applied to elevated fires.
FIRE SAFETY JOURNAL
(2024)
Article
Engineering, Civil
Mira von der Linde, Meinald T. Thielsch
Summary: This study investigates the motivation, emotions, and value of laypeople in fire incidents and finds that their active involvement provides support. The findings are helpful for emergency managers.
FIRE SAFETY JOURNAL
(2024)
Article
Engineering, Civil
Hong-Zeng Yu, Xiangyang Zhou
Summary: This study conducted fire tests to evaluate the effectiveness of incorporating nitrogen to enhance the fire extinguishing capability of water mist in an obstructed, naturally-ventilated enclosure. The results showed that adding nitrogen did improve the water mist's fire extinguishing capability, although the extent of improvement varied depending on the fire size, obstruction, and ventilation conditions.
FIRE SAFETY JOURNAL
(2024)
Article
Engineering, Civil
Rosaria Ono, Marcos Vargas Valentim, Fulvio Vittorino
Summary: This study presents the analysis of unimpeded walking speed of primary school children in descending movement in stairs, including the differences on walking speeds on the flights and landings and the impact of anthropo-metrical data on their walking speed. The research aimed to provide data for evacuation modelling that is not influenced by factors like crowds or adults controlling the flow. The findings show that anthropometrical characteristics or age do not significantly affect the children's movement in free walking condition, and the reduction factor on flights for children is higher than commonly adopted in simulation models.
FIRE SAFETY JOURNAL
(2024)
Article
Engineering, Civil
Nicolas Correa, Juan Cuevas, Andres Fuentes, Jose Luis Torero, Pedro Reszka
Summary: The use of mass timber framing in high-rise buildings requires accurate structural fire performance calculations. A thermal model incorporating char oxidation is proposed in this study, and its effectiveness is validated by replicating experimental results. However, the model fails to accurately simulate the behavior during the later stages of surface combustion.
FIRE SAFETY JOURNAL
(2024)
Article
Engineering, Civil
Bouaza Lafdal, Rabah Mehaddi, Pascal Boulet, Elmehdi Koutaiba, Tarek Beji
Summary: This paper presents a series of 48 enclosure fire experiments conducted in a 1.40 m cubic compartment. A new oscillatory combustion regime is discovered, characterized by alternations between well-ventilated and under-ventilated conditions. This finding calls for a better understanding and further analysis of the underlying physics.
FIRE SAFETY JOURNAL
(2024)
Article
Engineering, Civil
Shenggang Fan, Xingyang Zheng, Jiacheng Zheng, Meijing Liu, Daoyang Dong
Summary: Based on experimental data and constitutive models, a simplified constitutive model of AISI304 stainless steel at high temperatures was proposed and analyzed in this study. Finite element analysis results showed that the simplified constitutive model produced acceptable results compared to the constitutive model fitted based on experimental data, indicating its feasibility and accuracy in calculating the fire resistance of specimens.
FIRE SAFETY JOURNAL
(2024)
Article
Engineering, Civil
Julian E. Mendez, Martyn S. McLaggan, David Lange
Summary: The study characterised the fire spread dynamics in a simplified ventilated facade by conducting parametric experiments. The results showed a strong relationship between flame height and heat release rate. It was also found that the time for encapsulation failure and subsequent cladding material core ignition decreased as the cavity width was reduced. The study highlights the importance of considering the interaction of the products used in the facade and its geometry for the design of facade assemblies when accounting for the fire performance of the system.
FIRE SAFETY JOURNAL
(2024)
Article
Engineering, Civil
A. Galgano, C. Di Blasi
Summary: A sensitivity analysis was conducted on a one-dimensional solid-gas model for the ignition of thick poly (methyl methacrylate). The study found that the kinetics of polymer decomposition and monomer combustion play a crucial role in ignition time, and the properties of the polymer and the decomposition atmosphere should be properly considered.
FIRE SAFETY JOURNAL
(2024)
Article
Engineering, Civil
Thomas Gernay
Summary: This paper provides an overview of the application of the Performance-Based Design approach in structural fire design. The value of the approach is demonstrated through case studies, and the process and role of the structural fire engineer are described. Recent research conducted at Johns Hopkins University, including issues such as the coupling between fire and thermal-structural models, characterization of material behavior at elevated temperature, numerical modeling of structures in fire, probabilistic risk assessment, and cost-benefit analyses, is discussed. The paper concludes with a discussion of challenges and future perspectives for performance-based structural fire design.
FIRE SAFETY JOURNAL
(2024)
Article
Engineering, Civil
Salman Ahmad, Hafiz Usman Ahmed, Asad Ali, Xinyi Yang, Ying Huang, Mingwei Guo, Yihao Ren, Pan Lu
Summary: This study investigates the driving behavior patterns of individuals during historical wildfire events and reveals the influence of driving conditions and wildfires on driving behavior, as well as the differences in driving behavior patterns between rural and urban areas.
FIRE SAFETY JOURNAL
(2024)