Numerical Analysis of TB32 Crash Tests for 4-cable Guardrail Barrier System Installed on the Horizontal Convex Curves of Road

Wilde, Krzysztof; Bruski, Dawid; Budzyński, Marcin; Burzyński, Stanisław; Chróścielewski, Jacek; Jamroz, Kazimierz; Pachocki, Łukasz; Witkowski, Wojciech

doi:10.1515/ijnsns-2018-0169

Cited by 12 publications

(6 citation statements)

References 40 publications

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“…Bolt connections were modeled using solid elements with reduced integration. They had the material law dedicated to spot weld connections, which is a common approach in FE modeling [ 35 , 36 ]. The material characteristics of the bolts corresponded to the bolts class 8.8, according to the ISO 4032-8 standard.…”

Section: Materials and Methodsmentioning

confidence: 99%

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Influence of a Lighting Column in the Working Width of a W-Beam Barrier on TB51 Crash Test

et al. 2022

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Road equipment, such as, e.g., road safety barriers and lighting columns, are subject to certification according to the EN1317 standard to be allowed for use on European roads. In engineering practice, due to the terrain conditions, there are cases where other road equipment is installed within the working width of road safety barriers. Such situations are not considered during the certification process. Hence, the aim of this study is to analyze the effect of a lighting column installed within the working width of the barrier on the results of the TB51 crash test. The full-scale crash test and numerical simulation of this event were conducted. In the full-scale crash test, as well as in the simulation, the lighting column prevented the barrier’s post from properly disconnecting from the guardrail, which resulted in the barrier failing to restrain and redirect the 13-t bus. The simulation was quantitatively compared to the experiment, where the correlation coefficient of ASI curves equaled 84%. The THIV curves differed significantly between the experiment and the simulation, which is explained within the paper. Next, simulations with and without the lighting column were compared. The ASI and THIV in the simulation without the column were 0.33 and 16.1 km/h, respectively. In the simulation with the column, the ASI and THIV were 0.44 and 17.7 km/h, respectively. The maximum roll angle of the vehicle in the simulation without the column was 2.01° and with the column was 5.96°. The main difference, however, was that the system without the lighting column within the working width of the barrier was capable of properly restraining and redirecting the vehicle. The specific mechanics underlying this behavior are described within the paper.

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Section: Materials and Methodsmentioning

confidence: 99%

“…The constants of the ground’s plastic yield function constant were assumed as follows:

, and the pressure cut-off for tensile fracture was

MPa. These parameters were assumed based on previous work [ 35 , 36 , 39 ].…”

Section: Materials and Methodsmentioning

confidence: 99%

Influence of a Lighting Column in the Working Width of a W-Beam Barrier on TB51 Crash Test

et al. 2022

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“…Furthermore, in the LS-Dyna manual, typical values of friction for hard steel vs. hard steel and mild steel vs. mild steel are given as μ s = 0.78 and μ d = 0.08 (greasy), 0.42 (dry) and μ s = 0.74 and μ d = 0.10 (greasy) and 0.57 (dry), respectively. Since the behavior of a vehicle is strongly affected by friction [ 54 ], as discussed in Section 5.2.3 , the credibility of numerical modeling is questionable when friction data are not included. Therefore, in the last stage of the investigation, different properties of friction were assumed for the vehicle–lighting pole interface.…”

Section: Methodology Of Numerical Simulationsmentioning

confidence: 99%

Numerical Simulation of Vehicle–Lighting Pole Crash Tests: Parametric Study of Factors Influencing Predicted Occupant Safety Levels

Baranowski

Damaziak

2021

Materials

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In this paper, numerical simulations of the EN 12767 test procedure for a vehicle–lighting pole crash are presented. A representative soil–vehicle–lighting pole model is first developed. The Geo Metro vehicle model is used, and significant attention is given to representing the soil and its interaction with the traffic pole. Soil is represented using smoothed particle hydrodynamics (SPH) coupled with finite elements (FEs). A parametric study is carried out to investigate the key factors influencing the outcomes and consequently the estimation of the occupant safety levels during crash scenario described in EN 12767. First, a sensitivity study of lighting pole mesh is conducted As a result, the optimal mesh size is used for further studies regarding physical parameters such as soil properties and friction coefficient in vehicle–pole interfaces. Friction and mesh size are found to have a considerable influence on the acceleration severity index (ASI), theoretical head impact velocity (THIV), post-impact velocity and vehicle behavior during the lighting pole crash scenario.

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“…The maximum load recorded during an experimental test of the perpendicular impact of a 772-kg boogie vehicle on a single wire rope at the speed of 24 km/h was 165 kN [ 20 ]. Numerical simulations of the impact of a 1500-kg passenger car on a 4-cable barrier at the speed of 110 km/h and at the angle of 20° revealed that the forces in the rope can reach 76 kN [ 38 ]. The striking of a Heavy Goods Vehicle (HGV) weighing 38 tons into a 3-cable barrier at the speed of 65 km/h and at the impact angle of 7° can exert forces on one wire rope of up to 50 kN [ 39 ].…”

Section: The 3 × 7 19-mm Wire Ropementioning

confidence: 99%

Determination of the Bending Properties of Wire Rope Used in Cable Barrier Systems

Bruski

2020

Materials

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This paper presents research on the bending properties of 3 × 7 19-mm wire rope commonly used in road cable barriers. A total of 19 experimental tests were conducted. In addition, two nonlinear 3D numerical models of the wire rope using beam and solid finite elements were developed. Based on these models, four numerical simulations were carried out. The numerical results were validated against the experimental ones and a very good agreement was obtained. The main result of the research is the determination of the moment–curvature relationship for the wire rope considered. The effect of prestretching on the rope performance is discussed. The numerical results are analyzed in this paper in detail, including the behavior of the wire rope under bending and analyses of the cross-sectional and contact stresses. Suggestions concerning the type of finite element for wire rope modeling are also given. The results can be used, for example, in numerical simulations of crash tests of cable barriers.

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Numerical Analysis of TB32 Crash Tests for 4-cable Guardrail Barrier System Installed on the Horizontal Convex Curves of Road

Cited by 12 publications

References 40 publications

Influence of a Lighting Column in the Working Width of a W-Beam Barrier on TB51 Crash Test

Influence of a Lighting Column in the Working Width of a W-Beam Barrier on TB51 Crash Test

Numerical Simulation of Vehicle–Lighting Pole Crash Tests: Parametric Study of Factors Influencing Predicted Occupant Safety Levels

Determination of the Bending Properties of Wire Rope Used in Cable Barrier Systems

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