Table 3-4 Recommended Tornado Missile Barriers * for Performance Category 3

DOE-STD-1020-2002

Table 3-4 Recommended Tornado Missile Barriers * for Performance Category 3

Missile Criteria

Recommended Missile Barrier

Horizontal Component:

2x4 timber plank

8-in. CMU wall with one #4 rebar grouted in each vertical cell and trussed

15 lb @ 100 mph

horizontal joint reinforced @ 16 in. on center

max. height 150 ft.

Single width brick veneer attached to stud wall with metal ties

above ground

4 in. concrete slab with #3 rebar @ 6 in. on center each way in middle of

slab

Vertical Component:

2x4 timber plank

4 in. concrete slab with #3 rebar @ 6 in. on center each way in middle of

15 lb @ 70 mph

slab

Horizontal Component:

12-in. CMU wall with #4 rebar in each vertical cell and grouted; #4 rebar

3-in. diameter

horizontal @ 8 in. on center

steel pipe 75 lb

@ 50 mph

max. height 75 ft.

Nominal 12-in. wall consisting of 8-in. CMU with #4 rebar in each vertical

above ground

cell and grouted; #4 rebar horizontal @ 8 in. on center; single width brick

masonry on outside face; horizontal ties @ 16 in. on center

9.5- in. reinforced brick cavity wall with #4 rebar @ 8 in. on center each

way in the cavity; cavity filled with 2500 psi concrete; horizontal ties @

16 in. on center

8-in. concrete slab with #4 rebar @ 8 in. on center each way placed 1.5

in. from each face

Vertical Component:

3-in. diameter steel pipe 75 lb

6-in. concrete slab with #4 rebar @ 12 in. on center each way 1.5 in. from

@ 35 mph

inside face

See Footnote of Table 3-1 for interim conservative approach.

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