Download - 2. Mark Bloschock - How Barriers Work.pdf
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Mark J. Bloschock P.E.
Austin, Texas
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76% in the Vulnerable Users Group!
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Different and smaller cars
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Motorcycles an Lane Filtering
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Pedestrians Share the Roads Everywhere
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Pedestrians Walking Facing Traffic
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TALLER DE SEGURIDAD VIALBogot, Colombia02-03 Marzo
Better Roads. Better World.
Greg Speier
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TALLER DE SEGURIDAD VIAL
Bogot, Colombia02-03 Marzo
Better Roads. Better World.
Choosing the Appropriate
Barrier System toContain Errant Vehicles
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Outline
What does a roadside barrier do and why do we need
barriers?
Test levels
Classification of roadside barriers
How each class works
Basics of transitions and connections
Basics of terminals Barriers and the clear zone
Anchor bolts
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What does a roadside barrier do?
Contain an errant vehicle
Re-direct the vehicle
Minimize the effect on driver and passengers
Maintain the stability of the vehicle .
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How longitudinal barriers work
1 minute
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Contain and re-direct
35 seconds
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30%
23%19%
7%
5%
5%4%
7%
Roadway Departure Crashes
Overturn 30 Opposing Direction 23
Trees shrubs 19 Signs, Poles, Signals 7
Other fixed 5 Barriers 5
Topography 4 Other 7
Source: FHWA web site July 2015
Why do we want to contain and re-direct?
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Not to scale
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Two important terms
Dynamic deflection - Maximum deflection of the traffic
face of a barrier during an impact
Working width - Maximum distance between thetraffic face of the barrier and the maximum
deformation of the barriers main components or of
the vehicle during the impact .
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D = Dynamic deflection
W = Working width
D = Dynamicdeflection
W = Workingwidth
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Test levels
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MASH test levels NCHRP 350
820C2000P
820C2000P
820C2000P
820C2000P8000S
820C2000P
36000V
820C2000P
36000T
20
20
20
20
20
20
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Classification of roadsidebarriers
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Classification
of
longitudinal
barriers by
deflection
and post
type
Flexible barrier
with collapsible
posts:
Deflection1 5 m
Semi-rigid
strong post:deflection
0.3 2 m
Rigid:
Deflection
0 0.6 m
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Classification of longitudinal
barriers by deflection and post type
Flexible barriers with collapsible posts
Cables
W-beam or thrie-beam
Steel plates with wood trim
Conventional semi-rigid barriers
Rigid barriers
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How each class works
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D
D = Dynamic deflection
W = Working width
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D
W
D = Dynamic deflection
W = Working width
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D
WD = Dynamic deflection
W = Working width
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Basics of transitions andconnections
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Situations that require a transition
Crash cushion to steel barrier (or concrete wall) when
2 way traffic W-beam to thrie-beam .
N C ti B t B id R il d G d il
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No Connection Between Bridge Rail and Guardrail
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No Transition!
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No Transition!
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Bolted Connection
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Basics of terminals
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Standing Guardrail End
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Wh d i l d ?
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What does a terminal do?
Contain an errant vehicle
Re-direct the vehicle
Minimize the effect on driver and passengers
Maintain the stability of the vehicle .
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Function of a terminal
Anchor the barrier
Without
Presenting a spearing risk
Causing the vehicle to become airborne Causing the vehicle to flip over .
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58 of 47Taller de Seguridad Vial - Lima, Per - 12-13 Noviembre
Trailing End Treatments
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8 posts - full space - no cable
5 seconds
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8 posts - half space - cable
5 seconds
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8 posts - half space - no cable
5 seconds
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8 posts - full space - no cable - 4th post
5 seconds
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8 posts - half space - no cable - 4th post
5 seconds
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Barriers and theClear Zone
T
he clear zone
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The clear zone
The unobstructed, traversable area provided beyond
the edge of the through traveled way for the recoveryof errant vehicles.
The clear zone include shoulders, bike lanes, and
auxiliary lanes, except those auxiliary lanes that
function like through lanes.
Source: Roadside Design Guide 4th
Edition
The clear zone
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The clear zone
Clear zone is a function of:
Speed Traffic
Slopes
Curves .
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Breakaway sign bases?
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Breakaway sign bases?
Clear zone
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Clear zone
RDG guidance is a goal that often can not be obtained
Most errant vehicles are under control in a relatively smallarea
Many agencies strive to obtain a 10 m wide clear zone
When a terminal is placed at the start of a barrier many
agencies shoot for a run-out that is 20 m long.
Where do we start a barrier?
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70 of 47Taller de Seguridad Vial - Lima, Per - 12-13 Noviembre
Where do we start a barrier?
A barrier should begin at the point where an errant vehicle at a
typical departure angle (15 - 25) would no longer be able to
stop by itself before exiting the available clear zone
This is the Beginning of the Length of Need (BLON)
In the case of gating terminals the gating part of the barrier
should be positioned before the BLON.
Source: RDG 2011Departure angle
Run out length
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Source: RDG 2011
Suggested run-out lengths
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30ft(9m)75 ft (22.5 m)
Clear Zone Run-out
Not to scale
Run out length
Good clear zone example
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Good clear zone example
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TALLER DE SEGURIDAD VIAL
Bogot, Colombia02-03 MarzoBetter Roads. Better World.
Anchor bolts(Epoxy Adhesive Anchor Bolt Systems)
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Drill to
design depth
Blow out Brush w
alcohol
Brush
again
Blow out Epoxy
1/3
Screw bolt
Dont push
Torque nut
After hardened
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2 b 2 b 2
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2 by 2 by 2
2 b 2 b 2
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2 by 2 by 2
2 times with the air nozzle in each hole
2 b 2 b 2
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2 by 2 by 2
2 times with the air nozzle in each hole
2 times in and out with the brush
2 b 2 b 2
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2 by 2 by 2
2 times with the air nozzle in each hole
2 times in and out with the brush
2 times with the air nozzle in each hole again
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Session review
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Session review
What does a roadside barrier do?
Test levels
Classification of roadside barriers
How each class works Basics of transitions and connections
Basics of terminals
Barriers and the clear zone
Anchor Bolts