T. Sisson, P.E., M.ASCE and A. Montalva, P.E., P.Eng In high threat environments, it is challenging to provide blast protection for building occupants while financial resources, construction materials, and labor skills are poor or in limited supply. An important hazard to consider is the failure of window glazing, which is one of the leading […]
2019 Protective Knowledge: Protection in High Threat Environments Demonstration Course Announcement
Stone Security Engineering is pleased to announce our latest, and most exciting, protective design short-course. Developed for attendees from all backgrounds and disciplines who work in, or protect, people in high threat environments, this course is intended to provide practical information and solutions to the complex challenge of protection. The course will be 3-days long […]
Blast testing of military grade PAXCON by LINE-X performed at Stone-OBL’s open-arena facility proves durability against real-world terror attacks
PAXCON is a military grade polyurea coating designed to provide protection from the effects of high powered explosions by maintaining structural integrity and reducing the effects of flying debris. Testing was recently performed at the Stone-OBL open arena facility, designed and planned by Stone Security Engineering. The test compared the effects of an open-air […]
SDOF vs FEA
When looking at structural design or analysis for response to blast loading, there are two basic analytic approaches that are commonly implemented: Dynamic Single-Degree-of-Freedom Analysis and Dynamic Finite Element Analysis. Dynamic Analysis Dynamic analysis is used when dealing with blast loads. This type of analysis assumes that the load is applied instantaneously (or nearly so), […]
Time Matters: Blast Loads Defined by their “Time History”
Blast loads are defined by their “time history,” which is the trace of over-pressure throughout the load duration. An idealized blast time history is shown in the figure below (after UFC 3-340-01): The pressure (relative to ambient) is on the vertical axis and time is on the horizontal axis. The blast duration is generally taken […]
Six Steps to Specifying Blast Products
The world of blast protection has been rapidly expanding and there are now numerous products and approaches to provide protection from explosive attack. Where there used to be two solutions, there may now be ten. It is critical that security and design professionals understand the strengths and limitations of the various mitigation measures, and how […]