designing and testing bollards to protect pedestrians treatments... · 2013-12-01 · frontal crash...
TRANSCRIPT
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Transport and Road Safety (TARS) Research
Prof. Raphael Grzebieta
A/Prof (adjunct) George Rechnitzer Transport & Road Safety (TARS) - University of New South Wales
Designing and Testing Bollards To Protect Pedestrians
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Outline
Introduction
Current pedestrian injury rates
Interface Analysis Design – Survivability
Example poor interface designs
Example IAD bollard systems
Revision of AS/NZS 3845
Conclusions and Recommendations
2
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Introduction
Around 700,000 road crashes in Australia in 2011
1300 fatalities and 35,000 serious injuries (BITRE, 2012)
Pedestrian fatalities 14%
- 2010 = 170 deaths
- 2011 = 185 deaths
- 2012 = 174 deaths
Fatality downward trend has stalled.
Serious Injury (2008-2009 data only available for all Australia)
Pedestrian serious injury 7% (≈ 2500 serious injuries)
Intr
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Australian pedestrian fatalities since 2000 (BITRE annual fatality reports, 2009 & 2013)
Default 50 km/h
introduced
Intr
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NSW pedestrian injury rates
Falster M., Olivier J., Chong S., Grzebieta R.H., Watson W. (2009) Trends in severe
pedestrian injuries among older people in NSW, Proc. Road Safety Research, Policing and
Education Conference, Sydney.
Intr
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Safe System model - 2004
Howard, E., Implementing a "Safe System" approach to road safety in Victoria,
in Proc. Road Safety Research, Policing and Education Conference, 2004.
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Safe System model - 2004
Howard, E., Implementing a "Safe System" approach to road safety in Victoria,
in Proc. Road Safety Research, Policing and Education Conference, 2004.
Intr
od
ucti
on
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What is a survivable impact ?
20 km/h ?
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Source: Wramborg, P. (2005). A New Approach to a Safe and Sustainable Road Structure and Street Design
for Urban Areas. Paper presented at Road Safety on Four Continents Conference, Warsaw Poland. http://www.internationaltransportforum.org/jtrc/safety/targets/08TargetsSummary.pdf
Make crashes survivable – intrinsic safety
What is a survivable crash?
Safe System Approach
Pedestrian
or cyclist
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Source: Wramborg, P. (2005). A New Approach to a Safe and Sustainable Road Structure and Street Design
for Urban Areas. Paper presented at Road Safety on Four Continents Conference, Warsaw Poland. http://www.internationaltransportforum.org/jtrc/safety/targets/08TargetsSummary.pdf
Make crashes survivable – intrinsic safety
Design speed
impact limit for
survival –
recoverable injury
What is a survivable crash?
Safe System Approach
Pedestrian
or cyclist
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Source: Wramborg, P. (2005). A New Approach to a Safe and Sustainable Road Structure and Street Design for
Urban Areas. Paper presented at Road Safety on Four Continents Conference, Warsaw Poland. http://www.internationaltransportforum.org/jtrc/safety/targets/08TargetsSummary.pdf
Frontal crash
or hard object crash
Make crashes survivable – intrinsic safety
What is a survivable crash?
Safe System Approach
Pedestrian
or cyclist
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Frontal crash
or hard object crash
Make crashes survivable – intrinsic safety
Real world
with poor
enforcement
Australia’s default
limit 50km/h is
high!
What is a survivable crash?
Safe System Approach
Pedestrian
or cyclist
Source: Wramborg, P. (2005). A New Approach to a Safe and Sustainable Road Structure and Street Design for
Urban Areas. Paper presented at Road Safety on Four Continents Conference, Warsaw Poland. http://www.internationaltransportforum.org/jtrc/safety/targets/08TargetsSummary.pdf
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Video source: Transport Accident Commission (TAC) Victoria
What is a survivable crash?
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V = vehicle velocity
a = acceleration
D= length of skid
Speed from skid equation
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V = vehicle velocity
D = h = distance fallen
a = acceleration = g = 9.81 m/sec2
Speed from skid equation
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V = vehicle velocity
D = h = distance fallen
a = acceleration = g = 9.81 m/sec2
Speed from skid equation
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What is a survivable impact?
Murray N.W., When it Comes to the Crunch, The mechanics of Car Collisions, World Scientific,
Singapore, 1994
V = vehicle velocity
g = gravity acceleration
= 9.81 m/sec2
h = height above ground
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30 km/h ≡ falling off a house roof.
(10% risk of death)
40 km/h ≡ falling from window of a 2 story
house (35% risk of death)
50 km/h ≡ falling from window of a 3 story
building (80% risk of death)
60 km/h ≡ falling from roof of a 3 story house
(93% risk of death)
What is a survivable impact?
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Bad interface designs to protect pedestrians
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Bad interface designs to protect pedestrians & cyclists
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Preferable interface designs to protect pedestrians
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Preferable interface designs to protect pedestrians
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Crash Testing Requirements
TABLE 7.3 (a)
TEST MATRIX FOR BOLLARDS USED AS A SAFETY BARRIER
Test
Level Feature
Test
designation
Impact conditions
Impact
point
Evaluation
Criteria
(see Table 5.1 of
NCHRP 350)
Vehicle
Nominal
Speed
(km/h)
Nominal
Angleb
deg.
1
Bollard 1-100 1500A 50 0-20 (a) C,D,F,H,I
Bollard
Array
1-102 820C 50 0-20 (b) C,D,F,H,I,K,M
1-103 2000P 50 0-20 (b) C,D,F,H,I,K,M
2
Bollard 2-100 1500A 70 0-20 (a) C,D,F,H,I
Bollard
Array
2-102 820C 70 0-20 (b) C,D,F,H,I,K,M
2-103 2000P 70 0-20 (b) C,D,F,H,I,K,M
(a) See Figure 3.5 of NCHRP 350.
Testing requirement to separate cosmetic bollards vs crashworthy bollards
to protect both the pedestrian and the vehicle occupants
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Crash Testing Requirements
Acceptable performance may be:
• redirection, controlled penetration, or controlled stopping of the vehicle at
acceptable non-injurious deceleration rates;
• the vehicle should not penetrate, under-ride, or override the bollard
although controlled lateral deflection of the bollard is acceptable to a limit;
• detached elements, fragments or other debris from the bollard should not:
o penetrate or show potential for penetrating the occupant compartment;
o present an undue hazard to other road users, in particular to pedestrians;
o block the driver’s vision or otherwise cause the driver to lose control of
the vehicle;
• the vehicle should remain upright during and after collision although
moderate roll, pitching and yawing are acceptable.
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CO
NC
LU
SIO
NS
& R
EC
OM
MN
DA
TIO
NS
26
Conclusions & Recommendations
Interface Analysis and Design for Crashworthy Bollards
Energy dissipating bollards offer a practical protective interface
between vehicles and pedestrians principle for lower speed roads
Prevent ingress of an errant vehicle into a protected area by
providing positive passive protection for shopping strips, outside
dining areas, bus stops.
Bollards should be crash tested (either as barricades/gating so
that they don’t injure occupants if they are not crashworthy or as
passive crashworthy systems)
Bollards need to be marked whether they are barricades or
crashworthy systems (and to what level)
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Questions?