Author(s):
R.P. Bligh, N.M. Sheikh, W.L. Menges, R.R. Haug
Publication Date
May 2005
Abstract
The objective of this project is to develop and test a portable barrier system for high-speed applications that can be easily transported and erected by Texas Department of Transportation (TxDOT) maintenance forces using readily available equipment such as a front-end loader. Consideration was given to factors such as segment length, segment weight, connection method, barrier constructability, and dynamic barrier deflection. A deflection constraint of 3 ft was imposed by the project panel.
Based on the results of the testing and evaluation reported herein, the new precast, cross-bolt, F-shape concrete traffic barrier with l0-ft barrier segments is considered suitable for implementation on high-speed roadways. The cross-bolt connection system adapted for use in the new barrier helps limit dynamic deflection during an impact. When subjected to a crash test with an impact severity 15 percent greater than currently required in NCHRP Report 350, the barrier deflected only 27 inches. This is the lowest deflection of any free-standing, portable concrete barrier approved to NCHRP Report 350 requirements other than TxDOT's X-bolt barrier with 30-ft segments. The low deflection and ease of placement and repair make the barrier well suited for maintenance and work zone operations.
Report Number:
0-4692-1
Keywords:
CMB, Concrete Median Barriers, crash testing, F-Shape, New Jersey-Shape, PCB, Portable Concrete Barriers, roadside safety, safety shape
Link(s):
Document/Product
http://tti.tamu.edu/documents/0-4692-1.pdf
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