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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The purpose of blast resistant design is to minimize the satm caused by a blast as opposed zstm preventing damages. Engineers at the University of Missouri are developing a layer of glass fiber embedded in plastic that provides a reduced overall glass thickness, added strength to resist blasts, and transparency that many of the laminates do not have.
Conditions vary with respect to the travel distance of the breakage debris. As a minimum, insulating glass shall use laminated glass for the inboard protected side lite.
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 2428 decades. The blast wave, as it surrounds the structure, then creates both a downward pressure on the roof and an inward pressure on the sides of the building. One of the most common technologies currently being used is laminated glass. Great progress in design practice and product development has been made in the past decade, and will continue to be made 22248 forward.
Glass plies used to construct laminated glass are recommended to be either annealed or heat strengthened glass.
ASTM F 2248
Historical Version s – view previous versions of standard. They can be reached ator This email address is being protected from spambots. The width of glazing tape shall be at least equal to two times but not more than four times the thickness designation of the glass aatm which it adheres.
When designing for glazing, it is important to note that glass failure is not quantified in terms of whether or 22248 breakage occurs; rather, it is defined by the hazard it creates.
Many 2248 the leading window manufactures also have specific blast-resistant window models that incorporate these technologies in a singular system. The standard explain different methods to check the thickness and type of blast resistant glazing fabricated with laminated glass to glaze a fenestration.
UFC DoD Minimum Antiterrorism Standards ashm Buildings document was most recently updated in Februaryand includes blast resistance criteria for windows in both new astn existing facilities.
Given project-specific standoff distance and TNT-equivalent size, a 3-second duration ashm static pressure load can be interpolated. Developing technologies include approaches that are integral to the glass composition in lieu of lamination.
Blast pressures also increase linearly with the weapon size and exponentially with the distance from the explosion. Design considerations for both new and existing buildings should include adequate setback and standoff distance. In addition to specific requirements for glass size, lamination, deflection limitation, and testing, UFC design criteria is generally based on ASTM F 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.
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.
Work Item s – proposed revisions of this standard.
ASTM F | Revolvy
Link to Active This link will always route to the current Active version of the standard. From Wikipedia, the free encyclopedia. The width of silicone or glazing tape is referred to as bite and is shown and discussed in Guide C The main keywords to present this standard are air blast pressure, r resistant glazing, explosion, insulating glass, and laminated glass.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Structural design for blast resistance focuses on minimizing potential for awtm collapse through structural redundancy. This load is then used for design of the assembly frame, glazing frame bite, connections, and supporting structural elements.
Performance conditions established by GSA are categorized by breakage characteristics ranging from 1, which allows no breakage, to 5, xstm breakage debris travels ft or farther from the window. Blast resistance is typically only a requirement in federal facilities; however, it should be noted that building design for blast resistance is also a growing trend in the commercial and residential private sectors.
Technology News Lewis E.
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, explosion, insulating glass, and laminated glass.
Steel reinforcement or tubing within the window frame can provide added resistance to blast overpressures.
Window Design for Blast Hazard Mitigation
A secondary threat to consider is a hand-carried weapon that may potentially be placed directly against the building envelope.
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. Prior to this, there were essentially no government-wide blast resistance standards for security for civilian federal facilities.
Values given in parentheses are for information only. Terrorist activity is highly unpredictable and exists from a wide range of sources, leading to the increasing demand for reducing hazards in the event of an explosive blast. Various approaches may be used when designing fenestrations for blast-resistance.
Various damage levels should be considered, ranging from minor or non-structural to major, which may include progressive collapse. Since then, ISC has taken on a new approach to address the full spectrum of security threats through a series of documents outlining new security levels; baseline security countermeasures and implementation; risk assessment and identification; and performance measurement. The performance of building envelopes and cladding components during an explosive blast is more geared towards mitigating the hazards caused by the blast, as it has been found that many of the injuries and fatalities have been a direct result of flying glass and wall debris.