Concrete Barriers for Slopes or MSE Walls (405160-13)

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Final Report: Development of a Concrete Barrier Design for use in Front of Slope or MSE Wall
Executive Summary

TTI Research Supervisor:
Nauman Sheikh, P.E.
Texas Transportation Institute
Texas A&M University System
TAMU 3135
College Station, Texas 77843-3135
(979) 845-8955
[email protected]
Pooled Fund Technical Representative:
Dave Olson
Design Policy, Standards and Research Manager
Washington Department of Transportation
P.O. Box 47329
Olympia, WA 98504-7329
(360)705-7952
[email protected]

ABSTRACT

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.

Concrete Barrier and Test Vehicle after Testing.


ELIGIBILITY LETTER:

FHWA Eligibility Letter HSST_B-225

VIDEO LINK:


2017-01-17