¼” screws at four jamb corners – screws bending corners screws bending. – tearing in frame wall at connections pushing limits of ASTM F □ Minimal. Mullion/Frame Design – Allowable Stress Design. ▫ Design Load = Equivalent 3 second design load ASTM F ▫ Info Required –. ▫ 1) Level of Protection. 1 Aug ASTM a, F , “Standard practice for specifying an equivalent 3- second duration design loading for blast resistant glazing fabricated.
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A stationary vehicle weapon alongside a secured perimeter of a building is the primary threat to be considered in designing for blast resistance.
The fasteners that attach the framing system that supports the glazing to the structural framing system shall be designed to resist a uniform load acting on the blast resistant glazing that has a magnitude of at least: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Batten bars may be 22488 to increase the anchorage capacity of the glass itself. As a minimum, insulating glass shall use laminated glass for the inboard protected side lite.
ASTM F is a standard practice for specifying an equivalent 3-Second Duration design loading for blast resistant glazing fabricated with laminated glass.
Work Item s – proposed revisions of this standard. The standard explain different methods to check the thickness and type of blast resistant glazing fabricated with laminated glass to glaze a fenestration The main keywords to present this standard are air blast pressure, blast resistant glazing, axtm, insulating glass, and laminated glass. Steel reinforcement or tubing within the window frame can provide added resistance to blast overpressures.
Given project-specific standoff distance and TNT-equivalent size, a 3-second duration equivalent static pressure load can be interpolated. Views Read Edit View history. These include particular design of the glass or window frame components; increased anchorage of the window assembly itself; structural augmentation of the surrounding wall structure; or separate shielding systems and mechanisms designed to catch the debris. Performance conditions established by GSA are categorized by breakage characteristics ranging from 1, which allows no breakage, to 5, where breakage debris travels ft or farther from the window.
When designing to minimize damages from an explosion, it is important to balance the security concerns with other design constraints, such as d, feasibility and cost.
Blast mitigation ashm were credited for saving many lives during the September 11 attack on the Pentagon. The width of silicone or glazing tape is referred to as bite and is shown and discussed in Guide C ASTM International which was funded inis an international standards developing asym that develops and publishes standards for a wide range of materials, products, systems, and services.
Great progress in asrm practice and product development has been made in the past astmm, and will continue to be made going forward. Assistant Editor Onjeinika Brooks obrooks same.
Window Design for Blast Hazard Mitigation
This page was last edited on 28 Marchat Retrieved from ” https: With each assumed case, both the size of the weapon and location of the threat are crucially important. Common testing methods outlined in these standards include shock tube, where impulse pressures 2284 used to simulate an explosive blast, and open arena, where the test specimen is subjected to an actual explosive blast.
The system shall be designed to ensure that the glazing fails prior to the framing system that supports the glazing and its attachment to the structural framing system. The purpose of blast resistant design is to minimize the hazards caused by a blast as opposed to preventing damages. Values given in parentheses are for information only.
The fasteners that attach the framing system that supports the glazing to the structural framing system shall be designed to resist a uniform load acting on the blast resistant glazing that has a magnitude of at least:. Design considerations for both new and existing buildings should include adequate setback and standoff zstm.
Structural design for blast resistance focuses on minimizing potential for progressive collapse through structural redundancy. From Wikipedia, the free encyclopedia. Blast testing has shown that use of fully tempered glass plies, when fractured during a blast event, have poorer post blast performance than annealled or heat strengthened glass plies.
Various approaches may be aatm when designing fenestrations for blast-resistance.
ASTM F – Wikipedia
One of the most common technologies currently being used is laminated glass. The main keywords to present this standard are air blast pressure, blast resistant glazing, explosion, insulating glass, and laminated glass.
The standard explain different methods to check the thickness and type of blast resistant glazing fabricated with laminated glass to glaze a fenestration. It is the intent of blast mitigation to control the fracture of glazing in such a way that it does not create these hazards. Window Design for Blast Hazard Mitigation Reducing damage caused by explosive blasts has become an emerging area of interest due to several high-profile incidents over the last two decades.
In addition to specific requirements for glass size, lamination, deflection limitation, and testing, UFC design criteria is generally based on ASTM F Consideration for the type of glass with respect to breaking strength and behavior is also important.
They can be reached ator This email address is being protected from spambots. Link to Active This link will always route to the current Active version of the standard.
The performance of building envelopes and cladding components during an explosive blast is more d towards mitigating the hazards caused by the blast, as it has sstm found that many of the injuries and fatalities have been a direct result of flying glass and wall debris. Use of the annealed or heat strengthened glass plies will also reduce the amount of load transferred into the structure.
UFC DoD Minimum Antiterrorism Standards for Buildings document was most recently updated in Februaryand includes blast resistance criteria for windows in both new and existing facilities.
ASTM F 2248
Engineers at the University of Missouri are developing a layer of glass fiber embedded in plastic that provides a ashm overall glass thickness, added strength to resist blasts, and transparency that many of the laminates do not have. Load transfer from the glass to the window frame and surrounding walls should be taken into account when designing for window anchorage or structural augmentation of the supporting wall.
A range of manufacturers produce various lamination products based on desired response and performance characteristics.