Testing of State Roadside Safety Systems. Volume 3. Appendix B. Crash Testing and211 Evaluation of a Guardrail System for Low-Fill Culvert

摘要

The purpose of this study is to crash test and evaluate new or modified roadside211u001esafety hardware and where necessary, redesign the devices to improve their impact 211u001eperformance. The three major areas addressed in this study are the impact 211u001eperformance of bridge railings, transitions from guardrails to bridge railings, 211u001eand end treatments for guardrails and median barriers. This report presents the 211u001eresults of three crash tests conducted on long-span nested W-beam guardrail 211u001edesigns for use over culverts. The first test (test no. 471470-2) was on a 3.81-m 211u001e(12-ft, 6-in) span design. The second test (test no. 471470-4) was on a 5.72-m 211u001e(18-ft, 9-in) span with a W-beam rail section on the rear of the guardrail. The 211u001ethird test (test no. 471470-5) was also on a 5.72-m (18-ft, 9-in) span, but 211u001ewithout a W-beam rail section on the rear of the guardrail. All three crash tests 211u001ecorresponded to National Cooperative Highway Research Program (NCHRP) Report 230 211u001etest designation 10, involving a 2043-kg (4500-lb) passenger car impacting the 211u001eguardrail at a nominal impact speed and angle of 96.5 km/h (60 mi/h) and 25 211u001edegrees. All three nested W-beam guardrail designs performed satisfactorily in 211u001ethe creash tests and met all evaluation criteria set forth in NCHRP Report 230.