Three-dimensional discrete element simulation of the runaway vehicle deceleration process on the arrester bed of truck escape ramps

Qin, Pinpin; Wu, Fang; Da, Wu; Zhang, Shunfeng; Da-ming, Huang

doi:10.1177/0036850420940890

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…where V x is the speed at distance x from the beginning of the slope, V i is the initial speed (at the beginning of the slope), g is the gravity acceleration (9.81 m/s 2 ), and h x is an altitude difference of distance zero (at the beginning of the slope) [26,28]. e required length of the arrester bed of emergency escape ramps can also be determined as follows [29]:…”

Section: Literature Reviewmentioning

confidence: 99%

Location of Emergency Escape Ramps on Two-Lane Rural Highways Based on the Fuzzy Multicriteria Decision-Making Method

Heidarian

Kordani

Sarkar

et al. 2022

Journal of Engineering

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Today, the lack of practical research is one of the most important concerns worldwide, and location, which is an important issue in most projects, has received less attention from experts. In this study, the location criteria of emergency escape ramps were examined, and according to the Myers formula, the temperature-distance diagram along the route was obtained. Also, the speed of vehicles entering the escape ramp was examined according to the American Association of State Highway and Transportation Officials (AASHTO) in the proposed options that were obtained from the experts. Then, 3 general criteria and 16 subcriteria were classified, and finally, the importance of criteria was examined by the fuzzy analytic hierarchy process (F-AHP), and the high-priority options were illustrated using the fuzzy technique for order performance by similarity to ideal solution (F-TOPSIS). The proposed options were evaluated and prioritized for an emergency escape ramp on the two-lane rural highways of Salavat Abad village pass of Sanandaj city, Kurdistan Province, Iran. The results showed that the technical criteria with more than 69% among the general criteria and subcriteria of the percentage of longitudinal slope, longitudinal slope length, and vehicle design speed were the most important factors influencing the location of an emergency escape ramp. Moreover, among the proposed options, the four options 3, 4, 5, and 6 had the highest score, and option 6 (Kurkur turn (2)) was identified as the most priority location for implementing the emergency escape ramp.

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Section: Literature Reviewmentioning

confidence: 99%

Location of Emergency Escape Ramps on Two-Lane Rural Highways Based on the Fuzzy Multicriteria Decision-Making Method

Heidarian

Kordani

Sarkar

et al. 2022

Journal of Engineering

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“…The calculation is more complex, but the calculation accuracy is higher [15]. Qin et al [16] reduced the amount of particle calculation by improving the aggregate generation method and established a three-dimensional model of the stopping process of uncontrol vehicle in the truck escape ramps. They studied the influence of the sinkage of different vehicle weights and driving speeds on the stopping distance, and gave suggestions on the laying length and thickness of the brake bed.…”

Section: Introductionmentioning

confidence: 99%

Influence of Aggregate Pollution in Truck Escape Ramps on Stopping Distance of Uncontrolled Vehicles

Qin

et al. 2022

Sustainability

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Migration of fine materials such as soil from the roadbed and the ground will gradually pollute the aggregate in the arrester bed of truck escape ramps. However, there are few studies on the impact of aggregate pollution of the arrester bed on the stopping distance of runaway vehicles. This paper uses the discrete element method to study the influence of aggregates with different degrees of pollution on parking distance by taking silty cohesive soil as a typical pollutant. In this paper, the parking process of the uncontrolled vehicle on the arrester bed with different pollution levels was numerically simulated. The simulation results show that the uncontrolled vehicle’s parking distance increases with the contaminated aggregate’s soil content. The simulation results show that when the soil content in the contaminated aggregate is less than 15%, the increase in the parking distance of the uncontrol vehicle is less than 5%; when the soil content is 20–25%, the parking distance of the uncontrolled vehicle increases by more than 20%; and when the soil content is 30–35%, the parking distance of uncontrol vehicle increases by more than 50%. Different maintenance measures should be taken according to the increase in parking distance.

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“…Some truck escape ramps lack sufficient length or energy dissipation devices. 9 If the truck escape ramp cannot stop the brake-failure trucks, the trucks may rush out of the truck escape ramp, which causes a great threat to drivers, as shown in Figure 1 .…”

Section: Introductionmentioning

confidence: 99%

Simulation research on the protection performance of fall protection net at the end of truck escape ramp

et al. 2021

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Introduction: Although the fall protection net installed at the end of the truck escape ramp has a protective effect on trucks and drivers, but lacks sufficient theoretical basis and verification method. Objectives: The primary objective of this paper was to design a fall protection net that meets the regulations and research its protection performance. Methods: The finite-element method was used to design the overall size, material, mesh length, mesh type, shape, and supporting structure of the fall protection net installed at the end of truck escape ramp, then dummy and truck models were used to impact the fall protection net to verify the rationality of the design. After the design completed, the truck model was used to impact the fall protection net twice to research the cumulative protection performance. Results: A fall protection net with a width of 6000 mm, a span of 6000 mm, a depth of 5196 mm, a mesh length of 150 mm, a mesh type of diamond mesh, a shape of 60-degree V-shaped, a supporting structure of steel pipe supporting has a better effect on energy absorption and protection. Within the two consecutive impacts, the residual plastic deformation and stress of the fall protection net generated in the first impact severely affect the protection performance in the second impact. Conclusion: It is feasible to use the finite-element method to design and research the fall prevention net installed at the end of the truck escape ramp, and the fall protection net can indeed protect the trucks and drivers, and it should be inspected and maintained after impact to ensure the protective performance in subsequent use.

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Three-dimensional discrete element simulation of the runaway vehicle deceleration process on the arrester bed of truck escape ramps

Cited by 5 publications

References 13 publications

Location of Emergency Escape Ramps on Two-Lane Rural Highways Based on the Fuzzy Multicriteria Decision-Making Method

Location of Emergency Escape Ramps on Two-Lane Rural Highways Based on the Fuzzy Multicriteria Decision-Making Method

Influence of Aggregate Pollution in Truck Escape Ramps on Stopping Distance of Uncontrolled Vehicles

Simulation research on the protection performance of fall protection net at the end of truck escape ramp

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