Click for next page ( 85


The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement



Below are the first 10 and last 10 pages of uncorrected machine-read text (when available) of this chapter, followed by the top 30 algorithmically extracted key phrases from the chapter as a whole.
Intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text on the opening pages of each chapter. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

Do not use for reproduction, copying, pasting, or reading; exclusively for search engines.

OCR for page 84
84 installation although controlled lateral deflection of completely behind the guardrail, which is unacceptable. In the test article is acceptable. Test 52-2556-003, which is noted as "marginal pass," the Detached elements, fragments, or other debris from the vehicle came to rest on the rail with the cab on the backside test article should not penetrate or show potential for of the rail. penetrating the occupant compartment or present an In none of the tests was there any debris larger than a undue hazard to other traffic, pedestrians, or personnel 6.4-kg plastic blockout to present a potential hazard to other in a work zone. Deformations of, or intrusions into, the traffic, pedestrians, or personnel in a work zone. The vehicle occupant compartment that could cause serious injuries occupant compartment deformation evident after each pass- should not be permitted. ing test was also negligible. There was no windshield contact The vehicle should remain upright during and after col- and no intrusion into the occupant compartment for the pass- lision, although moderate rolling, pitching, and yawing ing tests, and the test vehicles remained upright during and are acceptable. after the collision with moderate rolling, pitching, and yawing. After collision, it is preferable that the vehicle's trajec- In tests 52-2556-003 and 004, the occupant risk criteria tory not intrude into adjacent traffic lanes. were satisfied in a similar fashion. In failed test 52-2556-002, The OIV in the longitudinal direction should not exceed however, the vehicle rolled over and a downstream post likely 12 m/s and the ORAs in the longitudinal direction should penetrated the windshield; the maximum cab deformation not exceed 20 Gs. was 330 mm. The exit angle from the test article preferably should be less than 60% of the test impact angle, measured at time of vehicle loss of contact with test device. SUMMARY In the tests shown in Table 39 that passed the NCHRP Several types of analyses were used in developing the Report 350 criteria, the vehicles were contained and redi- guidelines discussed in Chapter 6: review of prior studies, rected. The vehicles in the failed tests either completely or analyses of actual crash and geometric data, FEA simula- nearly completely vaulted the installation. In the successful tions, and full-scale curb traversal and crash tests. The results tests, the vehicle's post-collision trajectory was acceptable of these analyses provided insights into the nature and sever- and the recommended maximum longitudinal OIV and max- ity of crashes with curbs and curbguardrail combinations, imum ridedown acceleration were not exceeded. The vehicle the behavior of pickup trucks in such crashes, and the effects trajectory in the failed tests was completely or very nearly of various curb and impact conditions. TABLE 39 Summary of full-scale crash test results Nominal Guardrail height NCHRP 350 E-TECH Curb Curb offset speed (mm) Test 11 test no. type (m) (km/h) relative to approach evaluation 52-2556-001 85 B 0.0 550 Pass 52-2556-002 85 B 2.5 550 Fail 52-2556-003 80 NY 2.5 550 Marginal Pass 52-2556-004 80 NY 4.5 550 Fail 52-2556-005 80 NY 4.5 650 Pass 52-2556-006 70 NY 2.5 650 Pass 52-2556-007 85 NY 2.5 650 Pass