TTI Research Supervisor:
Nauman Sheikh, P.E.
Texas Transportation Institute
Texas A&M University System
College Station, Texas 77843-3135
(979) 845-8955 [email protected]
Pooled Fund Technical Representative:
Design Policy, Standards and Research Manager
Washington Department of Transportation
P.O. Box 47329
Olympia, WA 98504-7329
(360)705-7952 [email protected]
This research presents a design to restrict lateral deflection of a concrete barrier when placed adjacent to steep slopes or on top of Mechanically Stabilized Earth (MSE) walls, without using a concrete moment slab. This design was developed through the use of full-scale finite element vehicle impact analysis and crash testing. The design incorporates precast 20-ft long single slope barrier segments with grouted rebar grid connection. The barrier segments are embedded 10 inches in soil and are placed in front of a 1.5H:1V slope. The offset of the barrier from the slope break point of the soil embankment is restricted to a minimum of two feet.
A MASH Test 3-11 was performed to evaluate the performance of the embedded barrier. The barrier performed acceptably. The permanent lateral deflection of the barrier was 5.5 inches.
Concrete Barrier and Test Vehicle prior to Testing.