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Concrete Barrier Deflections

Question
State NE
Description Text
 Help My Memory is lacking:
The Iowa/ Kansas Concrete Protection Barrier was crash tested to 350 TL 3 and that the maximum deflections were as follows:

Freestanding = 24"
Strap down =   12"
Bolt down using 3 bolts from the front or traffic side = 6"


Portable Barriers


Date May 17, 2004
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Response
Response
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Here are the revised numbers obtained in our prior publications.

TL-3

Iowa original F-shape concrete barrier - 1.15 m or 45.3 in.
Simulated F-shape at 85th percentile conditions - approx. 24 in.
Iowa F-shape with tie-down straps - 850 mm at top (33.5 in.) - barrier
placed approx. 12 in. from deck edge - recommended that distance could be
reduced to 6 in.
Kansas/Iowa F-shape concrete barrier with 3 anchor bolts - 287 mm at top
(11.3 in.) - barriers placed approx. 1 in. from deck edge

TL-3 Plus (Heavier truck)

Iowa/Kansas F-shape concrete barrier - approx. 57 in. (p.s. deflection) - more exact analysis still pending
Date May 17, 2004
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