00802521

Component

https://doi.org/10.3141/1720-03

http://scholar.google.com...berg&publication_year=2000

A long-span guardrail for use over low-fill culverts was developed and successfully crash tested. The guardrail system was configured with 30.48 m of nested, 12-gauge W-beam rail and centered around a 7.62-m-long unsupported span. The nested W-beam rail was supported by 16 W152 x 13.4 steel posts and 6 standard CRT posts, each with two 150-mm x 200 x 360 mm wood block-outs. Each post was 1830 mm long. Post spacings were 1905 mm on center, except for the 7.62-m spacing between the two CRT posts surrounding the long span. The research study included computer simulation modeling with Barrier VII and full-scale vehicle crash testing, using 3/4-ton (680-kg) pickup trucks in accordance with the Test Level 3 (TL-3) requirements specified in NCHRP Report 350. Three full-scale vehicle crash tests were performed. The first test was unsuccessful because of severe vehicle penetration into the guardrail system. This penetration resulted from a loss of rail tensile capacity during vehicle redirection when the swagged fitting on the cable anchor assembly failed. A second test was performed on the same design, which contained a new cable anchor assembly. During vehicle redirection, the pickup truck rolled over and the test was considered a failure. The long-span system was subsequently redesigned to incorporate double block-outs on the CRT posts and crash tested again. Following the successful third test, the long-span guardrail system was determined to meet TL-3 criteria.

This appears in Transportation Research Record No. 1720, Roadside Safety Features and Hydraulic, Hydrology, and Water Quality Issues.

English

p. 19-29

2000

Transportation Research Record

0309066980

Figures; Photos; References (17) ; Tables (1)

Crash tests; Culverts; Design; Guardrails; Long span; Simulation

NCHRP Report 350

Bridges and other structures; Design; Highways; Research; Safety and Human Factors; I85: Safety Devices used in Transport Infrastructure

TRIS, TRB, ATRI

Nov 15 2000 12:00AM

• CALIFORNIA DEPARTMENT OF TRANSPORTATION STATEWIDE STORM WATER MANAGEMENT PROGRAM
• DESIGN AND DEVELOPMENT OF STEEL BREAKAWAY POSTS
• ESTIMATION OF TIME OF CONCENTRATION FOR MARYLAND STREAMS
• EVALUATING HUMAN RISK IN SIDE IMPACT COLLISIONS WITH ROADSIDE OBJECTS
• EVALUATION OF PORTABLE CONCRETE BARRIERS USING FINITE ELEMENT SIMULATION
• IMPACT PERFORMANCE OF THE G4(1W) AND G4(2W) GUARDRAIL SYSTEMS: COMPARISON UNDER NCHRP REPORT 350 TEST 3-11 CONDITIONS
• IN-SERVICE, PERFORMANCE-BASED ROADSIDE DESIGN POLICY: PRELIMINARY INSIGHTS FROM WASHINGTON STATE'S BRIDGE RAIL STUDY
• PERFORMANCE OF BREAKAWAY CABLE AND MODIFIED ECCENTRIC LOADER TERMINALS IN IOWA AND NORTH CAROLINA: IN-SERVICE EVALUATION
• SAFETY EFFECTIVENESS OF UPGRADING GUARDRAIL TERMINALS TO NCHRP REPORT 350 STANDARDS
• TEMPORAL VARIATIONS IN HEAVY METAL PARTITIONING AND LOADING IN URBAN HIGHWAY PAVEMENT SHEET FLOW: IMPLICATIONS FOR IN SITU TREATMENT DESIGN
• TEST LEVEL 4 BRIDGE RAILS
• TRANSITIONS FROM GUARDRAIL TO BRIDGE RAIL THAT MEET SAFETY PERFORMANCE REQUIREMENTS