Bumper Trajectories During High-Speed Impacts with 6-in. Curbs

Bumper Trajectories During High-Speed

Impacts with 6-in. Curbs

Ronald K. Faller, Ph.D., P.E.

Midwest Roadside Safety Facility (MwRSF)University of Nebraska-Lincoln

TRB Committee AFB 20June 15-18, 2008Jackson, Wyoming

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Introduction

• MGS placed 6 in. (mid-face) behind 6-in. high, AASHTO Type B curb met TL-3 of NCHRP 350

• Pooled Fund States sponsored study to determine performance limits of MGS behind 6-in. curbs allow for some variability in MGS placement allow for sidewalk placement in front of MGS reduce snow plow impacts with rail & resulting damage determine lateral offset when MGS needs to be raised

• Obtain bumper trajectories for curb impacts with pickup trucks and small cars

• Evaluate critical MGS offsets using MASH 082

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MGS w/ 6-In. Curb (Test NPG-5)

3

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Bumper Trajectory Test Set-up

4

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Vehicle-Curb Test - MGSC-1 (2270P)

5

4,966 lbs62.2 mph25 deg

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Vehicle-Curb Test - MGSC-2 (2270P)

6

4,966 lbs62.6 mph25 deg

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Vehicle-Curb Test - MGSC-3 (1100C)

7

2,544 lbs61.6 mph25 deg

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Wheel Damage - MGSC-3 (1100C)

8

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Vehicle-Curb Test - MGSC-4 (2000P)

9

4,479 lbs62.5 mph25 deg

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Curb-Lateral Coordinate System

10

Vehicle

Curb

Curb-Lateral Direction

Longitudinal Vehicle Path

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Critical Override Impact Point

11

Critical Point

Critical Point

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12

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13

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Predicted Safe Zones – 31” MGS

14

Bars Represent Safe Zones

2000P (MGSC-4)

1100C (MGSC-3)

2270P (MGSC-2)

2270P (MGSC-1)

Processed Curb-Lateral Distance (ft)

50 10 15 20 25

Unclear

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Predicted Safe Zones – 37” MGS

15

0

2270P (MGSC-1)

2270P (MGSC-2)

1100C (MGSC-3)

2000P (MGSC-4)

Bars Represent Safe Zones

Processed Curb-Lateral Distance (ft)

252015105

UnclearUnclear