Industry News




10/25/2011

Vehicle Risk Assessment & Physics 101

By David David Dickinson, Delta Scientific

 
Vehicle-Risk-Assessment
 

When evaluating the security risk for a car bomber or crasher for a given facility, focus on the weights and velocities of vehicles that could be used to attempt penetration into sensitive areas. 

A vehicle moving towards a barricade has a certain kinetic energy, the major measure of how much "hitting power" it possesses.  Mathematically, kinetic energy is derived from the vehicle velocity and its weight (mass).  On impact, some energy is converted to heat, sound and permanent deformation of the vehicle.  To stop the vehicle, the barricade must absorb the remainder. 

The remaining energy varies depends primarily on the velocity of the vehicle at the moment of impact.  The amount of kinetic energy possessed by a vehicle changes by the square of its velocity.  A vehicle moving at 50 mph has 25 times as much kinetic energy as at 10 mph.  An armored car weighing 30 times as much as a Toyota moving at 10 mph has less hitting power than the Toyota moving at 60 mph!

Because of the relationship of velocity to the total kinetic energy, every effort must be made by the security engineer to force a vehicle to slow down before it reaches the barricade.  The most frequently used technique is to require a sharp turn immediately in front of the barrier.  When vehicle speed is reduced by 50 percent, "hitting power" is reduced four times.  If the speed is reduced 2/3rds, the force of impact is reduced nine times.

 Upon designing a way to slow down vehicle approach, precautions should also be taken that the attacking car cannot make a "corner cutting shot" at a barricade.  Often, only a light post defines a turning point and a speeding car can take it out and not even hesitate.  Knolls and other impediments should be considered. Failing to understand this and not using the proper equipment to counter threats leads to a false sense of security.


 


Visit our website today to learn about the design flexibility of a Morton building and the endless possibilities of partnering with our designBUILD team.


Wood construction is both cost and energy efficient. Check out Morton Buildings and our designBUILD team online today to discover all the benefits of post-frame construction.

When choosing a metal-clad building for your next construction project, consider Morton Buildings, Inc., and their designBUILD team, we’ll make your dream a reality. 

We Can Help You Reduce Energy by 30%

Our mission is to help our customers manage their buildings' energy costs, improve reliability, and enhance performance while having a positive impact on the environment.
CLICK HERE to find out how.


Visit our website today to learn about the design flexibility of a Morton building and the endless possibilities of partnering with our designBUILD team.


Wood construction is both cost and energy efficient. Check out Morton Buildings and our designBUILD team online today to discover all the benefits of post-frame construction.

When choosing a metal-clad building for your next construction project, consider Morton Buildings, Inc., and their designBUILD team, we’ll make your dream a reality. 

We Can Help You Reduce Energy by 30%

Our mission is to help our customers manage their buildings' energy costs, improve reliability, and enhance performance while having a positive impact on the environment.
CLICK HERE to find out how.


 
comments powered by Disqus
07/27/2015

Survey shows pests can decrease perceived value of hospitality facilities.

07/24/2015

Nearly 25% of workers don’t know proper safety procedures for emergency situations.

07/23/2015

Better Buildings Challenge to help FMs replace troffer fixtures for efficiency improvements.

07/22/2015

Environmentally friendly buildings can improve occupant wellbeing. 

07/21/2015

Performance ratings now available for thermal, weather, and air barriers.

07/20/2015

Survey finds over half of employees are frequently unhappy with office temperature.

07/17/2015

State stays on track to achieve greenhouse gas reduction target.

07/16/2015

Lighting, acoustics rated as top concerns.

07/15/2015

Study shows health risks to long periods of standing.

07/14/2015

Social media giant selects wind energy.

07/13/2015

Global capacity increases to 1,712 GW.

07/10/2015

Mass killings may inspire similar acts of violence.

07/09/2015

Regulation will reduce waste, improve use of sustainable products.

07/08/2015

Alternative certification path to improve sustainability in California buildings.

07/07/2015

Development could improve solar capacity, storage.

07/06/2015

Regulation will reduce GHG emissions, incentivize the use of greener refrigerants.

07/02/2015

Sustainable parking leaders recognized.

07/01/2015

Design ‘scatters’ sound without affecting aerodynamics.

06/30/2015

Survey shows lack of concrete commitment to efficiency improvements.

06/29/2015

Guideline will protect building water systems.

Page 1 of 55
FirstPrevious[1]2345678910NextLast

Sponsored Links