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US. Department 400 Severin StS

of Transportation MAP ' 4 r9g9 Washington, DC

Federal Highway ~ nee .

Administration ‘ Soong :
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Mr. Ellsworth F. Vines

General Manager

Construction Products

L.B. Foster Company

P.0. Box 2806

Pittsburgh, Pennsylvania 15230

Dear Mr. Vines:

Your February 13 letter requested Federal Highway Administration (FHWA)
approval of a precast concrete traffic barrier/anchoring system that has been
patented by your company. In support of this request, you provided copies of
a report on a full-scale crash test conducted on November 15, 1988, by the
Texas Transportation Institute. This report, entitled “Evaluation of

L.B. Foster Precast Concrete Bolt-Down Barrier System," documents the results
of a crash test of an 18,000-pound single-unit van at approximately 50 m.p.h.
and a 15 degree impact angle. This is the maximum impact condition for a
Performance Level 2 bridge railing under the new AASHTO Guide Specification
for Bridge Railings.

The bridge rail that was impacted consisted of precast concrete safety shapes
in 15 and 20-foot lengths. The test installation was 125 feet long;
individual sections were 34 inches high, consisting of a 3-inch vertical face,
a 10-inch high middle inclined surface (55 degrees), and a 21-inch high upper
surface (84 degrees). Base width was 19 inches and the top width was

9 3/4 inches. These and other design details are shown on Drawings LB-T1 and
O-1 (Enclosure A). We have noted also that the barrier segments can be made
in lengths ranging from 12 feet to 20 feet in 1/8-inch increments. The
railing was installed on a simulated bridge deck that was 10 inches thick and
reinforced as shown in Enclosure 8. It was bolted to the deck using l-inch
diameter by 15 1/2-inch HS Hot Dipped Galvanized Kelibond Anchors set in
Keligrout to a depth of 6 1/2 inches. After 24 hours, the nuts were torqued
to 700 foot-pounds, producing approximately 36,000 pounds of pre-tensioning in
each bolt. The actual strength of each bolt, based on pull-out tests, was
approximately 40,000 pounds.

Our review of the test report indicated that the system described above
successfully contained and redirected the impacting truck. Neither the
barrier, the anchor bolts or the bridge deck were damaged in the crash.
Therefore, we have concluded that this system, when installed as described
above, is acceptable for use on Federal-aid highways if requested by a State
highway agency.


2

Since your product is a proprietary item, there must be a finding that it
satisfies one of the following conditions before it can be used on a Federal-
aid highway project: (a) its use is in the public interest because it is the
only suitable product for a particular application, (b) it is competitively
bid against a similar product, or (c) it is installed as an experimenta
feature.

Sincerely yours,

SO. Liaw

L. A. Staron
Chief, Federal-Aid and Design Division

Enclosures


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