A research of similarity design of collision guardrails under the overpass

Wang, Sujuan; Lei, Zhengbao; Zhao, Jian; Li, Yonghan; Lei, Muxi; Liu, Yiheng

doi:10.1109/mace.2011.5987337

Cited by 2 publications

(1 citation statement)

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“…Experimental and numerical research has recently been carried out on the dynamic response of reinforced concrete (RC) structures under lateral impact loads [12][13][14][15][16][17][18][19][20]. However, most of theses studies focused on vehicle collisions with bridge piers [21][22][23][24][25][26][27][28][29] and side barriers [30][31][32][33]. In other studies, more attention has been paid to the damaged vehicle components rather than the damage to structures [34].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Numerical Modeling of Prestressed Girder Bridges under Low-Velocity Impact

Elshazli,

Abdulazeez,

ElGawady

et al. 2024

Buildings

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Accidental collisions involving over-height trucks that exceed vertical clearance limits and bridge superstructures frequently happen, resulting in compromised girders and potential threats to structural safety and performance. The numerical simulation of large-scale prestressed girder bridge collisions poses challenges due to the associated nonlinearities, as well as the limited availability of large-scale experimental testing data in the literature due to cost and complexity constraints. This study introduces a numerical modeling approach to efficiently capture the response of prestressed girder bridges under lateral impact loads. A finite element (FE) model was developed using LS-DYNA and meticulously validated against experimental data from the literature. The study explored four methods for applying prestressing forces and evaluated the performance of four concrete material constitutive models, including the Continuous Surface Cap Model (CSCM), Concrete Damage Plastic Model (CDPM), Karagozian & Case Concrete (KCC) model, and Winfrith concrete model, under impact loads. Furthermore, an impact study was conducted to investigate the influence of impact speed, impact mass, and prestressing force on the behavior of prestressed girder bridges. Utilizing the dynamic relaxation (DR) approach, the developed FE model precisely captured the response of prestressed girders under impact loads. The CSCM yielded the most accurate predictions of impact forces, with an error of less than 8%, and demonstrated a strong ability to predict damage patterns. Impact speed, mass, and the presence of prestressing force showed a significant influence on the resulting peak impact force experienced by the girder. Furthermore, the study underscores the composite nature of the bridge’s response and emphasizes the importance of analyzing the bridge as a whole rather than focusing solely on individual girders.

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Section: Introductionmentioning

confidence: 99%

Comprehensive Numerical Modeling of Prestressed Girder Bridges under Low-Velocity Impact

Elshazli,

Abdulazeez,

ElGawady

et al. 2024

Buildings

View full text Add to dashboard Cite

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Vehicle Collision Analysis of the Reinforced Concrete Barriers Installed on Bridges Using Node-Independent Model

Kim,

Ahn

2024

Applied Sciences

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This paper focuses on improving vehicle collision simulations using finite element analysis (FEA) to examine interactions between reinforced concrete barriers and bridge decks. Three scenarios are explored: treating the barrier as a rigid body, analyzing reinforcement with a fixed base, and including the bridge deck’s cantilever portion beneath the barrier. Except for the rigid body model, a node-independent approach models the complex interactions between reinforcement and concrete in barriers on the bridge deck. This study evaluates barrier strength, occupant risk, and post-collision vehicle safety. Strength is assessed by examining stress in reinforcement and concrete, while occupant risk is measured using Theoretical Head Impact Velocity (THIV) and Post-impact Head Deceleration (PHD). Vehicle trajectory during collisions is also analyzed for stability. The results show significant differences in stress distribution and failure patterns when the bridge deck is considered compared to scenarios without it. Occupant risk evaluations suggest more flexible responses when the bridge deck is included. However, vehicle trajectory post-collision showed no significant differences across scenarios. These findings indicate that modeling efficiency varies based on evaluation criteria, suggesting a more realistic and effective approach for assessing barriers on bridges.

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A research of similarity design of collision guardrails under the overpass

Cited by 2 publications

References 0 publications

Comprehensive Numerical Modeling of Prestressed Girder Bridges under Low-Velocity Impact

Comprehensive Numerical Modeling of Prestressed Girder Bridges under Low-Velocity Impact

Vehicle Collision Analysis of the Reinforced Concrete Barriers Installed on Bridges Using Node-Independent Model

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