A numerical model for evaluating fire performance of composite box bridge girders

Zhang, Gang; Kodur, Venkatesh; Song, Chaojie; He, Shuanhai; Huang, Qiao

doi:10.1016/j.jcsr.2019.105823

Cited by 22 publications

(8 citation statements)

References 16 publications

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“…e last step is the structural simulation to evaluate the mechanical behavior. Due to the lack of data, previous studies [9,11,19] adopted the building-aimed temperature curves for bridges in the first step. Commonly used profiles included ISO834 [6] and ASTM119 [7] curves.…”

Section: Methodsmentioning

confidence: 99%

“…General studies simplified the fire condition as the temperatures increased over time developed for building structures, such as the ISO834 [6] curve and ASTM119 fire [7], which belong to the layered temperature model developed for indoor fires [8]. Such investigations [9][10][11] to predict the fire performance of bridges are basically a thermomechanical finite element method (FEM) simulation by applying the simplified fire-induced surrounding temperature field to a hypothetical exposed structural portion. However, bridge fires usually have no air limitations.…”

Section: Introductionmentioning

confidence: 99%

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Coupled CFD‐FEM Simulation of Steel Box Bridge Exposed to Fire

Zhi

2022

Advances in Civil Engineering

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Increasing fire-induced bridge failures are demanding more precise behavior prediction for the bridges subjected to fires. However, current numerical methods are limited to temperature curves prescribed for building structures, which can misestimate the fire impact significantly. This paper developed a framework coupling the computational dynamics (CFD) method and finite element method (FEM) to predict the performance of fire-exposed bridges. The fire combustion was simulated in CFD software, Fire Dynamic Simulator, to calculate the thermal boundary required by the thermomechanical simulation. Then, the adiabatic surface temperatures and heat transfer coefficient were applied to the FEM model of the entire bridge girder. A sequential coupled thermomechanical FEM simulation was then carried out to evaluate the performance of the fire-exposed bridge, thermally and structurally. The methodology was then validated through a real fire experiment on a steel beam. The fire performance of a simply supported steel box bridge was simulated using the proposed coupled CFD-FEM methodology. Numerical results show that the presented method was able to replicate the inhomogeneous thermomechanical response of box bridges exposed to real fires. The girder failed due to the buckling of a central diaphragm after the ignition of the investigated tanker fire in no more than 10 min. The framework presented in this study is programmatic and friendly to researchers and can be applied for the estimation of bridges in different fire conditions.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coupled CFD‐FEM Simulation of Steel Box Bridge Exposed to Fire

Zhi

2022

Advances in Civil Engineering

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“…Ryu et al (2006) studied the stiffness and strength of composite girders with Class 3 section under bending moment through 4-point flexural test. Zhang et al (2020) studied the degradation process of flexural capacity of composite box girders under fire through numerical simulation. In this paper, the plastic method is adopted to calculate the ultimate bending capacity of MVFT girder due to its clear concept, concise form and extensive use.…”

Section: Introductionmentioning

confidence: 99%

Ultimate Bending Strength Evaluation of MVFT Composite Girder by using Finite Element Method and Machine Learning Regressors

Xiong

Zhu

et al. 2022

Lat. Am. j. solids struct.

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This paper has evaluated the bending performance of a novel prefabricated MVFT steel-concrete composite girder. 9 meters pilot MVFT girder was analyzed by validated finite element model. In the pilot test, the height of web, the length of grouted concrete in the girder and net spacing between webs were parametrically modeled to discuss their effect to the bending strength. An ultimate bending strength formula has been obtained, which was based on the regression of parametric results. In the meantime, the two Machine Learning (ML) models, BP neural network and Least Squares Support Vector Machine, have been also implemented to train and then predict the ultimate strength of MVFT girder. Three factors were selected as input in ML models: the distance between steel girder's Tensile Centroid(TC) and slab's Compressive Centroid(CC), the distance between steel girder's TC and its CC, the compressive area of steel girder. After the completion of the ML training, the ultimate strength predictions of 30 meters MVFT girder by BP model and the formula have been compared, which agrees well with each other and validates their accuracy.

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“…Box girder bridges present a number of advantages such as: the fabrication of the girders is fast, they are lightweight, the fabrication costs are reduced, they have a good resistance at wind and torsion and they have an aesthetic constructive aspect, essential for the urban environment [2,7,8,9].…”

Section: Introductionmentioning

confidence: 99%

“…In the same time, box girder bridges presents a number of disadvantages such as: the mechanical resistance at fire is low because they have low specification for heat, they have high thermal conductivity and this leads to a low resistance of high temperatures for steel, the seismic simulations are very hard to be precise because the design of the bridge is very complex. Because of these disadvantages, most of the time, the reliability calculation leads to uncertainty [1,5,7,10,11].…”

Section: Introductionmentioning

confidence: 99%

Some analyzes on box girders bridges - literature review

Velniciuc

Bujoreanu

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Studies on box girders bridges that treats domains such as: its seismic response, fire resistance of the structure, effect of web inclination of the bridge, shear force distribution in webs of the bridge, loading conditions for the bridge with dead load and live load were reviewed and concluded. Our paper aims to describe different research from the dedicated literature using software such as Ansys, Midas, CSi Bridge with FEM (finite element method) and to highlight the points where the maximum stress values are found. This will help us in the future to compare these results obtained by experts with new analyzes that we want to accomplish regarding the efficacy and reliability of the box girder structure. The main motivation to study this domain is represented by the previous experience and knowledge and to detect new dangerous sections in this type of structure. By counteracting the dangerous sections, we can improve the reliability degree and efficiency of the box girder bridge structure.

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A numerical model for evaluating fire performance of composite box bridge girders

Cited by 22 publications

References 16 publications

Coupled CFD‐FEM Simulation of Steel Box Bridge Exposed to Fire

Coupled CFD‐FEM Simulation of Steel Box Bridge Exposed to Fire

Ultimate Bending Strength Evaluation of MVFT Composite Girder by using Finite Element Method and Machine Learning Regressors

Some analyzes on box girders bridges - literature review

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