Development of European End-Treatment TWINY Using Simulation and Crash Testing

Atahan, Ali Osman; Bonin, Guido; Cicinnati, Luigi; Yasarer, Hakan

doi:10.1061/(asce)0733-947x(2008)134:11(467)

Cited by 12 publications

(7 citation statements)

References 6 publications

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“…If no end treatment were used, the stiff panel of guardrail could either penetrate the vehicle injuring the occupants and/or cause the vehicle to roll-over also injuring anyone inside. Therefore, a large focus of designers and researchers relates to providing more effective and safer end terminals (Reid et al 2002, Coon and Reid, 2006, Atahan et al 2008.…”

Section: General Descriptionmentioning

confidence: 99%

“…A standard S235 JR steel material with 235 MPa yield strength, 0.3 poisson's ratio, 7.85E-09 t/mm3 density, 200 GPa modulus of elasticity, 0.25 failure strain and stress-strain curve was defined. These values were taken from a previous study performed by Atahan et al (2008). Note that stress-strain curve of steel is essential to obtain an accurate response behavior during large inelastic deformations.…”

Section: Model Developmentmentioning

confidence: 99%

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Evaluation of 12 m Long Turned Down Guardrail End Terminal Using Full-Scale Crash Testing and Simulation

Atahan

Erdem

2016

Lat. Am. j. solids struct.

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The beginnings and ends of guardrail designs have the function of providing adequate anchorage for the rest of the system. They should also demonstrate crashworthy performance and should not pose any hazard for errant vehicles. In Europe, the ends of guardrail systems traditionally have incorporated turned down end terminals. Due to its low cost, Turkey also adopted turned down guardrail end terminal, and the majority of these designs are 12 meters long. Accident statistics clearly demonstrate that this particular end terminal poses safety risks for impacting vehicles. However, crash tests performed on the system showed that it worked satisfactorily for cars impacting at 80 kph. In this study, a detailed finite element analysis was performed on a 12 m long turned down guardrail end treatment to fully evaluate its crashworthiness. Data obtained from previously performed TT 2.1.80 and TT 4.2.80 crash tests were used to verify the fidelity of finite element models used in the study. Further simulations performed in accordance with EN1317 part 7 at 100 kph demonstrated unacceptable performance for the end terminal. Results of the study are summarized and recommendations are presented.

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Section: General Descriptionmentioning

confidence: 99%

Section: Model Developmentmentioning

confidence: 99%

Evaluation of 12 m Long Turned Down Guardrail End Terminal Using Full-Scale Crash Testing and Simulation

Atahan

Erdem

2016

Lat. Am. j. solids struct.

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“…The deformation processes of such a system (for example road guardrail) may be approached as a separate object (Prentkovskis, Bogdevičius 2005;Prentkovskis et al 2007;2009) or analysed by integrating it into transport infrastructure, whose constituent parts are described in the papers of Atahan (2004), Atahan et al (2008), Antov et al (2009), Beljatynskij et al (2009), Dragčević et al (2009), Elvik et al (1997), Gowri and Sivanandan (2008), Junevičius and Bogdevičius (2009), Kinderytė-Poškienė and , Macek and Měšťanová (2009), Mohan et al (2005), Nagurnas et al (2008), Polivka et al (2007 and, , Reid et al (2009), Sokolovskij et al (2007), Tan et al (2008), Tautkus and Bazaras (2007), Vansauskas and Bogdevičius (2009), Viba et al (2009), Vorobjovas and Žilionienė (2008), Wu and Thomson (2007), etc. Prentkovskis and Bogdevičius (2005) presented and investigated the mathematical model of a deforming road guardrail, Prentkovskis et al (2007; presented the investigation of potential deformations which could develop in the elements of motor vehicle and pedestrian traffic restricting gates during motor vehicle-gate interaction, and Prentkovskis et al (2009) examine the deformation processes of the guardrail elements (a protective W-shape horizontal beam and a Σ-shape post).…”

Section: Purposes Of Road Guardrails and Overview Of Research Studiesmentioning

confidence: 99%

“…In next research, Atahan et al (2008) developed European end-treatment using simulation and crash testing. A simple guardrail end-treatment, called TWINY, designed particularly for the use with a Thrie-beam guardrail system is developed.…”

Section: Purposes Of Road Guardrails and Overview Of Research Studiesmentioning

confidence: 99%

A Study of the Deflections of Metal Road Guardrail Post

Prentkovskis

Beljatynskij

Juodvalkienė

et al. 2010

Balt. J. Road Bridge E.

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Road guardrails of various types (made of reinforced concrete, cable and metal) are installed on the shoulders and traffic lanes of urban and suburban roads. Metal guardrails, consisting of Σ-shape and double T-shape metal posts and a protective W-shape horizontal beam, are the most popular. The deformation processes of the Σ-shape and double T-shape metal posts of the above-mentioned guardrails are examined. A mathematical model of Σ-shape (or double T-shape) metal post is developed. A metal post of Σ-shape (or double T-shape) is modeled, using one-dimensional firstorder finite elements, and taking into account elastic deformations, as well as the effect of soil on the buried post section of the guardrail. The deflections of Σ-shape and double T-shape metal posts caused by the impact of a motor vehicle moving at varying speed are determined.

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“…Previous research suggests that the type of road restraint system and its placement play essential roles in the acceptable performance of these designs during an impact [6,7]. Therefore, it becomes critical to contain and redirect vehicles from entering the ditches in such cases.…”

Section: Introductionmentioning

confidence: 99%

Traffic Safety at Median Ditches: Steel vs. Concrete Barrier Performance Comparison Using Computer Simulation

Yucel

Atahan

Arslan

et al. 2018

Safety

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In Turkey, concrete V-shaped ditches are formed at the median section of divided highways to provide drainage. Recent accidents show that these ditches actually present safety risks to vehicles entering the medians. Vehicles either cross over the ditch, roll over, or become trapped in the ditch, depending upon the mass, size, speed, and angle of the entering vehicle. To overcome this safety risk and reduce the severity of these accidents, longitudinal barriers are installed along these ditches. Currently, in Turkey, steel barriers are extensively used to improve traffic safety at median ditches. In this paper, the crash performances of steel and concrete barriers used at medians with ditches are compared. A model of a standard steel EDSP-1.33 barrier and a model of a newly developed concrete C470 barrier were constructed, and impact simulations were performed for when they are installed at a ditch slope break point. A nonlinear finite element program, LS-DYNA, was used for the analysis. A 13,000 kg bus model was used to impact both barriers in accordance with European standard requirements for crash tests. Simulation results show that when the steel EDSP-1.33 barrier is used, the bus has the potential for excessive penetration of the ditch, with significant barrier deformation. Moreover, the barrier damage is extensive, resulting in increased maintenance costs. On the other hand, the concrete C470 barrier successfully contains and redirects the 13,000 kg bus impact, with minimal barrier deformation and safety risk. Even though the concrete barrier slides toward the inside of the ditch, the bus does not enter the ditch area and exits the barrier in a stable manner. Therefore, to increase traffic safety at ditches located at the median section of divided highways in Turkey, utilization of the newly developed concrete barrier C470 is recommended.

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Development of European End-Treatment TWINY Using Simulation and Crash Testing

Cited by 12 publications

References 6 publications

Evaluation of 12 m Long Turned Down Guardrail End Terminal Using Full-Scale Crash Testing and Simulation

Evaluation of 12 m Long Turned Down Guardrail End Terminal Using Full-Scale Crash Testing and Simulation

A Study of the Deflections of Metal Road Guardrail Post

Traffic Safety at Median Ditches: Steel vs. Concrete Barrier Performance Comparison Using Computer Simulation

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