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原文传递 IT'S A JUNGLE OUT THERE: USING THE BULLNOSE GUARDRAIL TO PROTECT THE ELEPHANT TRAPS.

题名：	IT'S A JUNGLE OUT THERE: USING THE BULLNOSE GUARDRAIL TO PROTECT THE ELEPHANT TRAPS.
作者：	Reid-JD; Hargrave-MW; Rekenthaler-D Jr.
关键词：	COMPUTER-PROGRAMS; DEPRESSED-HIGHWAYS; GUARDRAILS-; HIGHWAY-BRIDGES; HIGHWAY-SAFETY; IMPACT-TESTS; LIGHT-TRUCKS; SAFETY-ENGINEERING; SIMULATION-; STATE-DEPARTMENTS-OF-TRANSPORTATION; TRAFFIC-SAFETY; U.S.-DEPT.-OF-TRANSPORTATION; U.S.-FEDERAL-HIGHWAY-ADMINISTRATION
摘要：	The Federal Highway Administration (FHWA), in conjunction with a number of state departments of transportation (DOTs), is working to improve guardrail systems as part of a much larger highway safety campaign being orchestrated by the U.S. DOT. FHWA is particularly concerned about the guardrail systems that protect the opening between side-by-side bridges: openings that often lead to depressed roadways running perpendicular to the bridges above. Such openings are euphemistically known as elephant traps. Falling into the elephant trap could lead to a catastrophic crash with loss of life for the occupants of the vehicle and for any unsuspecting motorists below. One crash barrier that is used to prevent out-of-control vehicles from falling into the elephant trap is known as the bullnose guardrail system, so-named because of its distinctive U-shaped design. State DOTs are fond of bullnose systems because of their low cost and strong safety potential. However, to use bullnose systems, engineers need to bring them into compliance with a provision in the National Cooperative Highway Research Program Report No. 350 (Recommended Procedures for the Safety Performance Evaluation of Highway Features) that requires crash tests to include light trucks. For several months, engineers at the University of Nebraska's Center of Excellence used LS-DYNA, a computer analysis system that employs nonlinear impact finite element code to reconstruct crash tests in the virtual world of digital electronics, to run simulations designed to strengthen bullnose guardrails to meet the new standard. Once the design concept was verified by LS-DYNA, subsequent field tests using a light truck were successful.
总页数：	Public Roads. 1999/01. 62(4) pp13-17 (5 Phot., 2 Fig.)
报告类型：	科技报告