Numerical simulation of the influence of the selected factors on the performance of a concrete road barrier H2/W5/B

Pachocki, Łukasz; Wilde, Krzysztof

doi:10.1051/matecconf/201823101014

Cited by 12 publications

(5 citation statements)

References 14 publications

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“…Niezgoda et al [22] in their studies on the use of computer-assisted software in modeling and simulation of crash tests, it was recommended that numerical and experimental tests largely confirm each other, and the use of computer-aided software in crash tests would be convenient. Pachocki and Wilde [23] stated in their study that the H2W5-B type steel barrier was successfully designed and tested with LS-DYNA non-linear FE program. It has been seen that the common FE program used in the road restraint system (RRS) research is LS-DYNA.…”

Section: Figure 1 -(A) Concrete Barriers (Rigid) (B) Steel Guardrails...mentioning

confidence: 99%

Finite Element Analysis and Investigation of Critical Impact Point of Steel Guardrails Affecting Safety and Structural Performance

Özcanan

2023

Turkish Journal of Civil Engineering

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After the guardrails are designed, the structural adequacy and safety criteria are determined by the relevant standards and full-scale crash tests. One of the widely used standards is European Norm 1317 (EN1317). Guardrail systems generally consist of rails and posts. The guardrails are more rigid around the posts, which are mounted on the ground or embedded in soil at certain intervals. Therefore, it is important for driver/passenger and roadside safety to determine the most critical point in terms of structural and safety performance and design according to the most unfavorable situation. With this motivation, in this study, the effect of different impact points on the structural and safety performance of the H1W4 guardrail was investigated by finite element (FE) analysis. For this purpose, first of all, the finite element models of the H1W4-A system were calibrated and validated with real crash test data. Then, with the help of the validated models, analyses were completed for different impact points as 0.5, 1.0, 1.5 and 2.0 meters with a half-meter difference for the standard 2-meter post spacing. In the light of the measured safety parameters such as Acceleration Severity Index (ASI), Theoretical Head Impact Velocity (THIV) and structural performance criteria such as working width (W) and exit angle (α), the critical impact point for the guardrail was determined. Contrary to what is generally known, crashing vehicles into flexible points (0.5 and 1.0 m) rather than impacting rigid points (1.5 and 2.0 m) creates a more negative situation in crash tests.

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Section: Figure 1 -(A) Concrete Barriers (Rigid) (B) Steel Guardrails...mentioning

confidence: 99%

Finite Element Analysis and Investigation of Critical Impact Point of Steel Guardrails Affecting Safety and Structural Performance

Özcanan

2023

Turkish Journal of Civil Engineering

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“…The selected barrier was a concrete safety system of a H2W5B class (BSI, 2010). The model of this barrier has been validated and successfully used in previous studies (Pachocki and Wilde, 2018;Pachocki and Bruski, 2020). The impacting vehicle was a 2014 Honda Accord, developed and validated by the NHTSA (Singh et al, 2018).…”

Section: Global Model Of Vehicle Collisionmentioning

confidence: 99%

Biomechanics of Lumbar Spine Injury in Road Barrier Collision–Finite Element Study

Pachocki

Daszkiewicz

Łuczkiewicz

et al. 2021

Front. Bioeng. Biotechnol.

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Literature and field data from CIREN database have shown that lumbar spine injuries occur during car crashes. There are multiple hypotheses regarding how they occur; however, there is no biomechanical explanation for these injuries during collisions with road safety barriers (RSBs). Therefore, the objective of this study was to investigate the mechanics of vertebral fractures during car collisions with concrete RSBs. The finite element method was used for the numerical simulations. The global model of the car collision with the concrete RSB was created. The lumbar spine kinematics were extracted from the global simulation and then applied as boundary conditions to the detailed lumbar spine model. The results showed that during the collision, the occupant was elevated, and then dropped during the vehicle landing. This resulted in axial compression forces 2.6 kN with flexion bending moments 34.7 and 37.8 Nm in the L2 and L3 vertebrae. It was shown that the bending moment is the result of the longitudinal force on the eccentricity. The lumbar spine index for the L1–L5 section was 2.80, thus indicating a lumbar spine fracture. The minimum principal strain criterion of 7.4% and damage variable indicated L2 and L3 vertebrae and the inferior part of L1, as those potentially prone to fracture. This study found that lumbar spine fractures could occur as a consequence of vehicle landing during a collision with a concrete RSB mostly affecting the L1–L3 lumbar spine section. The fracture was caused by a combination of axial forces and flexion bending moments.

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“…The use of computeraided software in the design of roadside safety systems and crash tests has been suggested as a result of the studies. [9][10][11] In addition to the studies mentioned above, there are many studies that have been done for the design and analysis of a security system or a part of it by using FEs such as new generation L1 containment level guardrail, 12 cable barrier system, 13 mobile anti-terror barrier, 14 and bollard systems. 15 It has been seen that the common FE program used in road restraint system (RRS) research is LS-DYNA.…”

Section: Introductionmentioning

confidence: 99%

Head-on and angular impact-based investigation of mechanical behavior of guardrail post types with finite element analysis

Özcanan

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The geometric sections of guardrail systems that provide roadside safety are important in terms of their safety and structural performance. Guardrail systems generally consist of posts and beam. One of the critical components that affect the performance of steel guardrail systems is the post. Many different types of posts are used in practice. In this sense, the mechanical performance of the most commonly used S-C-I-Z-rectangular-circular post types in this study was investigated and compared on the basis of their failure performances. For this, the finite element (FE) model of the pendulum system, which was previously validated with empirical data, was used. In the FE analysis, the mechanical performance of posts embedded in soil and fixed on top of the ground was investigated by the pendulum system in head-on and angular impact situations. As a result of the FE analyses; the mechanical performances were different for head-on and angular impact situations. However, since circular and rectangular posts show the best performance in case of angular impact, and considering in terms of guardrail systems, angular impact situations are a matter of concern, it has been understood that the use of closed-section posts as circular and rectangular in guardrail systems will provide safety and economic advantages.

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Numerical simulation of the influence of the selected factors on the performance of a concrete road barrier H2/W5/B

Cited by 12 publications

References 14 publications

Finite Element Analysis and Investigation of Critical Impact Point of Steel Guardrails Affecting Safety and Structural Performance

Finite Element Analysis and Investigation of Critical Impact Point of Steel Guardrails Affecting Safety and Structural Performance

Biomechanics of Lumbar Spine Injury in Road Barrier Collision–Finite Element Study

Head-on and angular impact-based investigation of mechanical behavior of guardrail post types with finite element analysis

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