A Localized Fire Model for Predicting the Surface Temperature of Box Girder Bridges Subjected to Tanker Truck Fire

Wu, Xiaoni; Huang, Ting; Au, Ftk; Li, Jing

doi:10.1007/s10694-020-00966-2

Cited by 12 publications

(3 citation statements)

References 27 publications

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“…From the results of the group of 270 mm long specimens, the adoption of direct axial tension or cyclic testing procedure hardly affected the mean bond stress results. Apparently higher mean bond stresses were observed in specimens with relatively shorter bonded lengths [37][38][39] as the evenly distributed bond stress assumption was most likely valid. To better understand the relative low bond stresses in first batch specimens, specimen I-60-270P1 was cut through for detailed inspection of the bonding interface between the strand and grout, as shown in Figure 13.…”

Section: Mean Bond Stress and Bond Forcementioning

confidence: 94%

“…This observation could be attributed to the insufficient interlocking effect due to the helical configuration of the strand, the shrinkage of cement grout, and the lubrication effects caused by the oil on the surface of strands in the specimens in the first batch. Apparently higher mean bond stresses were observed in specimens with relatively shorter bonded lengths [37][38][39] as the evenly distributed bond stress assumption was most likely valid. To better understand the relative low bond stresses in first batch specimens, specimen I-60-270P1 was cut through for detailed inspection of the bonding interface between the strand and grout, as shown in Figure 13.…”

Section: Mean Bond Stress and Bond Forcementioning

confidence: 94%

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Cyclic Bond-Slip Behavior of Partially Debonded Tendons for Sustainable Design of Non-Emulative Precast Segmental Bridge Columns

Xia

Hu²,

Guan³

et al. 2023

Sustainability

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The precast segmental bridge columns incorporating resettable sliding joints have been proposed to extend the accelerated bridge construction techniques to regions of moderate to high seismicity while fulfilling the sustainability-based resilient seismic design concept. Following a rethink of the design strategy in the light of inspirations from hybrid sliding-rocking joints, the design of resettable sliding joints can accommodate a certain amount of horizontal sliding displacement and adopt partially debonded tendons in a vertical manner, probably resulting in complicated tensile-flexural loading scenarios in these tendons during earthquakes, which is rarely considered in practice. In this paper, the sustainable design of resettable sliding joints is introduced. A tailor-made setup was established and simplified cyclic bond-slip tests were conducted to validate the practicality of the proposed partially debonded tendon system. Twelve specimens were fabricated using different strands and grouting techniques, and a two-stage numerical model was proposed to interpret the experimental results of seven typical specimens. The results suggest that the deterioration of reloading stiffnesses can be captured by an additional effective length caused by bond failure, and the strands perform mostly elastically under relatively large transverse displacements. The loading stiffness of the anchorage is 26.3 kN/mm, and it has significant effects and the proposed two-stage model can satisfactorily capture the envelope of the response of the partially debonded tendons, providing practical design for the proposed partially debonded tendons used in sustainable non-emulative precast segmental bridge columns.

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Section: Mean Bond Stress and Bond Forcementioning

confidence: 94%

Section: Mean Bond Stress and Bond Forcementioning

confidence: 94%

Cyclic Bond-Slip Behavior of Partially Debonded Tendons for Sustainable Design of Non-Emulative Precast Segmental Bridge Columns

Xia

Hu²,

Guan³

et al. 2023

Sustainability

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show abstract

“…Peris-Sayol et al [15] adopted the coupled CFD-FEM method to analyze the behavior of a simply supported steel bridge and analyze the parametric influence caused by horizontal constraint, modeled component count, vertical clearance, and wind. Increasing studies in recent years took the coupled CFD-FEM approach as an advanced tool to predict the performance of bridges in various fire conditions [16][17][18].…”

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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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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Surrogate Model-Driven Estimation of Adiabatic Surface Temperature of Fire Exposed Suspension Bridge Towers

Mostofi,

Altunişik

2024

Fire Technol

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A Localized Fire Model for Predicting the Surface Temperature of Box Girder Bridges Subjected to Tanker Truck Fire

Cited by 12 publications

References 27 publications

Cyclic Bond-Slip Behavior of Partially Debonded Tendons for Sustainable Design of Non-Emulative Precast Segmental Bridge Columns

Cyclic Bond-Slip Behavior of Partially Debonded Tendons for Sustainable Design of Non-Emulative Precast Segmental Bridge Columns

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

Surrogate Model-Driven Estimation of Adiabatic Surface Temperature of Fire Exposed Suspension Bridge Towers

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