Estimation of Window Damage

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MIL-HDBK-1013/14
APPENDIX D (Continued)
Table D-9
Distances in Feet (Meters) to Produce Structural Damage
for 10,000- to 40,000-Pound (4,545- to 18,182-kg) Bombs
R/W1/3
Structural
10,000 lb
20,000 lb
30,000 lb
40,000 lb
Damage
(4,545)
(9,091)
(13,636)
(18,182)
Category
Severe
10
215
271
311
342
(65.5)
(82.6)
(94.8)
(104.2)
Heavy
18
388
488
559
615
(118.2)
(148.7)
(170.4)
(187.4)
Moderate
24
517
651
745
820
(157.6)
(198.4)
(227.1)
(249.9)
Minor
30
603
760
870
957
(183.8)
(231.6)
(265.2)
(291.7)
Minimal
40
862
1,085
1,242
1,367
(262.7)
(330.7)
(378.5)
(416.6)
D.5.7
Estimation of Window Damage. Generally, buildings contain windows that are
highly vulnerable to damage from the effects of an explosion. Common annealed glass will
normally fail between 0.2 psi and 0.5 psi (0.014 to 0.035 kgf/sq cm). Table D-10 shows the
distances for threshold breakage of two conventional window sizes. Smaller windows will
withstand slightly higher pressures (which equates to smaller standoff distances) than large
windows. The ratio of length to width (aspect ratio) and thickness also have a minor effect.
Table D-10
Conventional Window Breakage Threshold Distances in Feet (Meters)
for 50- to 4,000-Pound (37.7- to 1,818-kg) Bombs
Sample Description
50 lb
220 lb
500 lb
1,000 lb
4,000 lb
(23.7)
(100)
(227)
(454)
(1,818)
Ordinary Annealed
636
1,596
2,534
3,584
6,478
Commercial Window
(193)
(485)
(770)
(1,089)
(1,969)
48 x 96 x 1/4 inches
Ordinary Annealed
597
1,167
1,619
2,102
3,458
Residential Window
(181)
(355)
(492)
(639)
(1,051)
28 x 36 x 3/16 inches
NOTE: Table D-10 is provided only to illustrate the relatively low strength and
fragility of conventional glazing systems. It is not intended for design or selection purposes.
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