Design of high-performance concrete barriers for heavy vehicles has seen little advancement in recent years. Barrier improvements were needed in terms of design aesthetics, safety performance and economy. Specifically, advancement was deemed necessary in the design of barrier geometry for improving vehicle stability and mitigating concerns for occupant head slap on the barrier, improved understanding of impact loads for heavy vehicles and use of these loads to optimize barriers, and improved barrier aesthetics. This paper describes the development of two NCHRP Report No. 350 Test Level 5 (TL-5) barriers that address these needed advancements. First, a TL-5,open concrete bridge rail was designed with a focus on determining accurate impact loads and providing a barrier geometry with improved safety and aesthetics. Next, a TL-5 concrete median barrier was developed through rigorous analysis of barrier shape options to determine the safest and most economical barrier shape. Structural design of the barrier was also optimized to minimize cost while meeting the design loads for heavy vehicles. Theopen concrete bridge rail and the concrete median barrier were successfully full-scale crash tested according to the TL-5 safety requirements set forth in NCHRP Report No. 350. These designs represent a major advancement in the safety and economy of high-performance concrete barriers.
Abstract