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.
|Published (Last):||5 January 2007|
|PDF File Size:||6.81 Mb|
|ePub File Size:||12.92 Mb|
|Price:||Free* [*Free Regsitration Required]|
This criteria applies provisions for glazing, framing, connections and supporting structural elements.
ASTM F | Revolvy
As a minimum, insulating glass shall use laminated glass for the inboard protected side lite. Differing satm shapes can either dissipate or accentuate an explosive blast. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Work Item s – proposed revisions of this standard. Window Design for Blast Hazard Mitigation Reducing damage caused by explosive blasts has become an emerging area of astj due to several high-profile incidents over the last two decades. Various damage levels should be considered, ranging from minor or non-structural to major, which may include progressive collapse.
ASTM F 2248
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 responsibility of the user of this standard to establish appropriate safety and health ff and determine the applicability of regulatory limitations prior to use.
Blast testing has shown that use of fully tempered glass plies, when fractured during a blast event, have poorer post blast 22248 than annealled or heat strengthened glass plies.
Alexandria, VA 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.
ast This load is then used for design of the assembly frame, glazing frame bite, connections, and supporting structural elements. It is the responsibility of engineers, designers and builders to account for the safety and well-being of the public.
Consideration for the type of glass with respect to breaking strength and behavior is also important. The report established security standards and levels for existing facilities.
The main keywords to present this standard are air blast pressure, blast resistant glazing, explosion, insulating glass, and laminated glass. Yet there are obvious limitations in cases of cities and densely populated areas.
ASTM F – Wikipedia
It is the intent of blast mitigation to control the fracture of glazing in such a way that it does not create these hazards. Given project-specific standoff distance and TNT-equivalent size, a 3-second duration equivalent static pressure load can be interpolated.
Performance conditions established by GSA are categorized by breakage sstm ranging from 1, which allows no breakage, to 5, where breakage debris travels ft or farther from the window. Prior to this, there were essentially no government-wide blast resistance standards for security for civilian federal facilities.
Blast mitigation design is a rapidly evolving trend in the building industry. 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. Structural design for blast resistance focuses on minimizing potential for progressive collapse through structural redundancy.
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 asttm flying glass and wall debris. Conditions vary with respect to the travel distance of the breakage debris. A secondary threat to consider is a hand-carried weapon that may potentially be placed directly against the building envelope.
Use of the annealed or heat strengthened glass plies will aastm reduce the amount of load transferred into the structure. Graphic Courtesy Graham Architectural Products. The system shall ff designed to ensure that the glazing fails prior to the framing system that supports the glazing and its attachment to the structural framing astk.
New and improved technologies are continuously being researched, developed and tested.