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FHWA Acceptance
letter
issued
March
12, 2004
4
Download the letter
4
Download the 1 Enclosure
4
Download the 2 Enclosure
This
is the first presentation on, now commercially available, all steel,
super-crash-barriers from Sistema Barrier Systems, all of which exhibit
higher than NCHRP 350, Test Level (TL) 6, required Kinetic Energy (KE)
Management. These super-crash barriers have been in limited use on
critical German and Italian highway and railway bridges since 1991.
At
present, U.S. Federal Highway Administration (FHWA) policy is
incorporation of NCHRP 350, Test Level 4 rated bridge railing designs
for new bridge construction such as the reinforced concrete barrier
shown below : |
NCHRP
350, TL-4 rating requires a minimum
Kinetic Energy (KE) Management requirement of 128
kJ
(nominal less suggested allowable negative tolerance) [from Table 3.6,
page 31].
The nominal required KE
Management for an NCHRP 350, TL-6
rating is
596.2
kJ.
The
Sistema Super Barrier Standard Designs start at a KE Management of
642 kJ and go
to a fully loaded tractor-trailer handling
KE Management of 1220
kJ .
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comparison of brute KE Management, NCHRP 350, TL-4’s
128
kJ vs
Sistema’s 1220
kJ, belies, the Sistema Barriers’ structural engineering design
methodology. Barrier
design “failure-mode” is achieved via choice of “bolt-down”
dowel selection. Predetermined
dynamic deflections as little as 1 cm are full-scale crash test
verified.
Download: PDF drawings
1.
Crash test drawing Germany ( Munich) SECTION |
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| All
Sistema Barriers offer narrow-profile designs conforming to
narrow-width, thin bridge decks, commonly encountered on bridge
rehabilitation projects. The
typical all-steel Sistema TL-6+
barrier is 1/6th the weight per foot of the standard
reinforced concrete half-section TL-4 “Jersey” barrier.
The Sistema barriers’ bolt-down design means that even
permanent installations can be easily moved out of the way during future
rehabilitation construction or in emergency situations. |
Sistema, all steel,
hot-dipped galvanized, duplex coated, Super Crash Barrier
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The
Sistema Barriers, for “Work-Zone” and “Home-Land-Security” (HSL)
applications where tractor-trailer incursion denial is intended, of
either a temporary or permanent nature, are the only commercially
available crash barriers that don’t require large “foot-print” and
expensive foundations.
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