Crash analysis and evaluation of vehicular impacts on W-beam guardrails placed on sloped medians using finite element simulations

Gutowski, Matthew; Palta, Emre; Fang, Hsu Wei

doi:10.1016/j.advengsoft.2017.04.004

Cited by 26 publications

(7 citation statements)

References 24 publications

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“…It should be noted that the design of this study did not take into consideration many important variables that play some role on the overall post crash scenario, like the road lateral angle. Some of these issues are discussed in [29]. Also, the study is limited to a single car model, ie the impact mass and structure were the same in the various simulations.…”

Section: Discussionmentioning

confidence: 99%

Performance of some basic types of road barriers subjected to the collision of a light vehicle

Neves

Fransplass

Langseth

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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The investigation of the performance of road barriers to the car collision is not very often studied in the literature despite the importance of the topic to the passengers' safety. Indeed, the various road barriers systems are seldom compared in terms of their capabilities in reducing the overall damage in an accident. Here, flexible and rigid road restraint system subjected to a 900 kg car impact is studied in detail via a finite element simulation, with the model being validated against experimental results. The model relies on dynamic material properties for the guardrail, which were measured in Split Hopkinson Pressure Bar. Three severity occupant indexes, ASI, THIV and PHD, are explored and used to infer road barriers behaviour when interacting with a light vehicle. It is also investigated the failure limit of bolted connections and its influence on the guardrail impact result by means of the car trajectory. According to test TB11 from EN 1317 standard, the impact simulation results using a 900 kg car show that the flexible guardrail is safer than any of the analysed concrete barriers.

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Section: Discussionmentioning

confidence: 99%

Performance of some basic types of road barriers subjected to the collision of a light vehicle

Neves

Fransplass

Langseth

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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“…Authors work on improving numerical models ensuring that they best represent real test results. As an example in [ 62 , 63 ], the authors focussed on analysing cable barriers, works [ 64 , 65 , 66 ] covered steel guardrail barriers and [ 67 , 68 , 69 ] studied concrete safety barriers. In addition, innovative devices are tested that are partly built of plastics [ 70 , 71 ].…”

Section: Introductionmentioning

confidence: 99%

Assessing Roadside Hybrid Energy Absorbers Using the Example of SafeEnd

et al. 2022

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A combination of crash cushion and end-terminal, hybrid energy absorbing devices have been in use worldwide for a few years already. They include SafeEnd, a system Poland has recently introduced. Some road authorities have raised concerns as regards the operating conditions of the devices and how they work together with safety barriers. The objective of this research is to clarify the concerns and answer the following questions: (1) Can SafeEnd devices be used as hybrid devices and combine the roles of end-terminal and crash cushion placed before an obstacle? (2) What should be the rules for installing crash cushions at diverging roads and at the start of an off-ramp? The article presents characteristics of SafeEnd devices, defines the doubts raised by road safety auditors, discusses the results of field and numerical tests of the devices and explains the design principles for interchange ramps where crash cushions are required. The study results have helped to answer the research questions: SafeEnd devices fulfil the role of end-terminal and crash cushion, it is possible to make them more visible and principles have been defined for how the devices should be used at road interchanges. Further research should help to define general principles of deploying road restraint systems such as crashworthy terminals, crash cushions or hybrid devices.

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“…As an important safety measure in a roadway, especially in a mountainous area, a guardrail prevents a vehicle from rushing out of the road in the case of an accident, offering the last protection to the drivers and passengers (Sassi and Ghrib, 2014;Teng et al, 2016). The buried metal pipe is the main load-carrying component of the guardrail (Gutowski et al, 2017). The length of the buried part of the metal pipe directly determines whether the guardrail can play the protection role when an accident occurs.…”

Section: Introductionmentioning

confidence: 99%

Estimate buried metal pipe length using PZT detected stress wave reflection

Luo

Hei

et al. 2020

Journal of Intelligent Material Systems and Structures

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A roadway guardrail, as the driver’s last safety barrier, is an important part of a transportation system. The buried depth of the metal pipe directly determines the bearing capacity of the guardrail during an impact. It is important to estimate the buried depth during the inspection of a guardrail system. In this paper, we proposed an original method by integrating wavelet denoising, multiple self-correlation analysis (MSA) and energy spectrum analysis (ESA) to estimate the length of buried metal pipe based on the stress wave reflection. The stress wave is initiated by an impact on the exposed end of the buried pipe and stress wave reflection is detected by a PZT (Lead Zirconate Titanate) transducer. To execute the proposed method, firstly, Wavelet denoising is used to process the reflected stress wave signal to improve the signal-to-noise ratio. Then, the MSA detects the major frequency of the reflected signal. At last, the ESA extracts the time interval between the reflected signal and the excitation signal with the help of Short Time Fourier Transform (STFT) that acquires the frequency band where the reflected signal is located. Experimental verifications were carried out, and two different lengths of buried metal pipes are selected to verify the feasibility of the proposed method. The experimental results indicate that the proposed method can accurately extract the length of buried metal pipes. The superiority of the proposed method over the traditional methods, such as Peak-Peak Discriminance (PPD) and Phase Analysis Method (PAM), is demonstrated by experimental comparative studies.

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Crash analysis and evaluation of vehicular impacts on W-beam guardrails placed on sloped medians using finite element simulations

Cited by 26 publications

References 24 publications

Performance of some basic types of road barriers subjected to the collision of a light vehicle

Performance of some basic types of road barriers subjected to the collision of a light vehicle

Assessing Roadside Hybrid Energy Absorbers Using the Example of SafeEnd

Estimate buried metal pipe length using PZT detected stress wave reflection

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