BLAST RESISTANT STRUCTURES PDF DOWNLOAD!
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For more information see Reference 1. How different are seismic and blast effects on structures?
The first difference is in the way a given structure is loaded. In the case of an earthquake the structure is subject to blast resistant structures motions that shake the structure from the base up.
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In the case of blast resistant structures explosion produced by an air or a surface burst, the structure is loaded by means of a compression wave shock wave over some area. Since a portion of the blast energy is coupled into the ground, the structure is also subject to ground motions similar to an earthquake, though much less intense.
A second difference is the duration of loading. For earthquakes, the duration of induced motions shaking can range from seconds to minutes. For conventional explosives, the duration of a pressure wave is on the order of milliseconds.
International Review of Civil Engineering (IRECE)
For example, in the Oklahoma City event, the yield of the weapon was approximately 4, lb TNT equivalent. The peak pressure at the face of the buildings was blast resistant structures 1, psi, and the duration of the positive phase of the pulse was approximately 3 ms.
Judging by the size of the crater, a fair portion blast resistant structures the energy coupled into the ground, producing ground shock. However, judging by the damage, clearly air blast was the primary damage mechanism. Further, earthquakes shake an entire building, but produce mostly horizontal loads at floor-slab levels, concentrating in the specially designed, laterally stiffer structural blast resistant structures.
Blast usually does not attack the entire structure uniformly, but produces the most severe loads to the nearest structural elements, both vertical and horizontal, with little regard to their stiffness.
Uplift pressure load on floors is also a specific blast effect. What is the role of structural ductility in blast resistance? Blast-resistant designs often conservatively assume elastic response in order to simplify design, minimize permanent plastic deformations, and reduce post-blast repairs, blast resistant structures where functional continuity of the facility is considered.
Building can be re-used with blast resistant structures after the blast. Structural elements getting into fully plastic range. Repair cost will become equal to fresh construction cost after the blast.
Blast Resistant Modular Buildings | Blast-proof Buildings - ATCO
However men, equipment and materials can be safely evacuated out of the building. Performance criteria to be chosen for plant buildings are decided based on blast resistant structures criticality.
Local design for blast loading for the elements will involve calculating and satisfying these limits.
Blast resistant design philosophy is to allow the elements to behave in the in-elastic range.