You are on page 1of 32

# D CASE STUDY II SCHOOL COMMUNITY SAFE ROOM

SECOND EdITIon

Internal Pressure Coefcients for Buildings (Table 6-7 of ASCE 7-98; Figure 6-5 of ASCE 7-05)
GCpipos = 0.55 for partially enclosed buildings GCpineg = -0.55 for partially enclosed buildings

## Atmostpheric Pressure Change (APC)

The internal pressure coefficient, GCpi, may be taken as 0.18 when venting area of 1 square foot per 1,000 cubic feet of interior safe room volume is provided to account for APC. As an alternative to calculating the effects of APC, and designing an appropriate venting system for the safe room, the design may be completed using an internal pressure coefficient GCpi = 0.55 as a conservative means to account for APC.

Design Wind Pressure for Rigid Buildings of All Heights (Section 6.5.12.2.1 of ASCE 7-98 and ASCE 7-05)
(for positive internal pressures) pwi = (qz)(G)(Cp1) (qh)(GCpipos) plee2a = (qz)(G)(Cp2a) (qh)(GCpipos) plee2b = (qz)(G)(Cp2b) (qh)(GCpipos) pside = (qz)(G)(Cp3) (qh)(GCpipos) proof1 = (qz)(G)(Cp4) (qh)(GCpipos) proof2 = (qz)(G)(Cp5) (qh)(GCpipos) proof3 = (qz)(G)(Cp6) (qh)(GCpipos) (for negative internal pressures) pwi = (qz)(G)(Cp1) (qh)(GCpineg) plee2a = (qz)(G)(Cp2a) (qh)(GCpineg) plee2b = (qz)(G)(Cp2b) (qh)(GCpineg)
D-

pwi = 17.68 windward wall plee2a = -118.73 leeward wall (wind parallel to ridge) plee2b = -132.60 leeward wall (perpendicular to ridge) pside = -155.72 side wall proof1 = -178.84 roof pressures (0 14 ft from windward edge) proof2 = -132.60 roof pressures (14 28 ft from windward edge) proof3 = -109.48 roof pressures (more than 28 ft from windward edge)

pwi = 167.28 windward wall plee2a = 30.87 leeward wall (wind parallel to ridge) plee2b = 17.00 leeward wall (perpendicular to ridge)
DESIGN AND CONSTRUCTION GUIDANCE FOR COMMUNITY SAFE ROOMS

SECOND EdITIon

E-

SECOND EdITIon

## E WALL SECTIONS THAT PASSED PREVIOUS MISSILE IMPACT TESTS

2x4 stud wall with CD grade plywood, 14-gauge -inch expanded metal, and concrete infill 2x4 stud wall with CD grade plywood, 14-gauge -inch expanded metal, and concrete infill 2x4 stud wall filled with concrete with no plywood and 14-gauge -inch expanded metal on the non-impact face 2x4 stud wall filled with concrete with no plywood and 14-gauge -inch expanded metal on the non-impact face 2x4 stud wall filled with concrete with no plywood and 14-gauge -inch expanded metal on the non-impact face 4-inch concrete block in a 2x6 stud wall with 1 inches polystyrene between block and two layers of -inch CD grade plywood Double 2x4 stud wall with 4 layers of -inch CD grade plywood and 14-gauge steel on the back face

The missile impacted 4 inches to the left of a stud. No damage was visible on the back of the target. The missile impacted 1 inches to the left of a stud. No damage was visible on the back of the target. The missile imade partial contact with the stud. The concrete was cracked around the impact area. The missile imade partial contact with the stud. The concrete was severely damaged, and a 4-inch deflection on the back of the target was observed. The missile impacted the concrete. No damage was visible.

The missile penetrated the target. There was no visible damage to the back side of the target.

The target was impacted next to a stud. Several heads of screws were popped off the back of the target. The steel had 1 inch of deformation. The target was impacted on the stud line. The stud was cut in two. No deformation was visible on the back side. The missile penetrated the target 1-2 inches. A crack in the plywood on the back face caused bending, but total separation did not occur.

Double 2x4 stud wall with 4 layers of -inch CD grade plywood and 14-gauge steel on the back face

4 layers of -inch plywood with 14-gauge steel insert with spacers between the insert and the back face

E-

SECOND EdITIon

E-

SECOND EdITIon

E-

SECOND EdITIon

F-

SECOND EdITIon

F-

SECOND EdITIon

## DESIGN AND CONSTRUCTION GUIDANCE FOR COMMUNITY SAFE ROOMS

F-

F-
Pressure Test? yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes 3-point 3-point M.P.1 yes 1 1/2 pair 1 1/2 pair no no 1 pair yes yes 3 x 7 no L Mfr 3 Out yes yes yes yes yes yes yes yes yes yes no yes yes 3 x 7 no 32 x 83 no 32 x 81 no 36 x 80 no 3 x 7 no 3 x 7 no 3 x 7 pair Removable 4 x 8 pair Removable 3 x 7 no 3 x 7 pair Removable 10 x 10 no 3 x 7 no 3 x 7 no L Mfr 4 L Mfr 5 L Mfr 5 L Mfr 5 L Mfr 6 L Mfr 6 L Mfr 6 L Mfr 6 L Mfr 6 L Mfr 72 L Mfr 8 L Mfr 9 L Mfr 9 3-point M.P.1 M.P.1 M.P.1 3-point 3-point 3-point 3-point 3-point 3-point no no no no no no yes yes yes yes no yes yes yes yes yes yes yes yes no no no no no no no yes no no no no no no no no no no no no 1 1/2 pair 1 pair 1 1/2 pair 1 1/2 pair 1 1/2 pair 1 1/2 pair 1 1/2 pair 2 pair 1 1/2 pair 1 1/2 pair In In In In In In Out Out Out Out N/A Out Out yes 3 x 7 no L Mfr 3 M.P.1 no yes no 1 1/2 pair In yes yes yes yes 3 x 7 3 x 7 3 x 7 3 x 7 no no no no L Mfr 1 L Mfr 2 L Mfr 1 L Mfr 2 3-point 3-point 3-point 3-point no no no no yes yes yes yes yes yes yes yes 1 1/2 pair 1 1/2 pair 1 1/2 pair 1 1/2 pair Out In In In 14 Lock Points, M. Security Frame 10 Lock Points 6 Lock Points 6 Lock Points Impact Test? Size wxh Center Mullion Lock Locking Manufacturer Mechanism (L Mfr) Push Bar? Latch (3/4) Deadbolts (1) Hinges Door Swing Remarks 16-gauge hollow metal frame Coiling Overhead Door 2.55 psi max. pressure 5.00 psi max. pressure 14 Lock Points, M. Security Frame yes yes yes yes yes yes yes yes yes yes yes 100x 88 yes N/A N/A yes yes yes yes yes no no no no 3 x 7 no 3 x 7 no 3 x 7 pair no 3 x 7 pair no 3 x 7 pair Removable 40 x 60 36 x 36 40 x 60 36 x 36 L Mfr 6 L Mfr 6 L Mfr 6 L Mfr 10 L Mfr 6 N/A N/A N/A N/A 3-point 3-point 2-point 2-point 3-point N/A N/A N/A N/A yes yes yes yes yes N/A N/A N/A N/A N/A no no no no no N/A N/A N/A N/A N/A no no no no no N/A N/A N/A N/A N/A 1 1/2 pair 1 1/2 pair 1 1/2 pair 1 1/2 pair 1 1/2 pair N/A N/A N/A N/A N/A Out Out Out Out Out N/A N/A N/A N/A N/A Exit Only Hardware Window - 5.00 psi pressure Window - 5.00 psi pressure Window - 9.50 psi pressure Window - 8.98 psi pressure 2- 50x44 openings, special glass and frame

## enclosed enclosed enclosed enclosed

D Mfr 4

enclosed

D Mfr 5 D Mfr 6 D Mfr 6 D Mfr 6 D Mfr 7 D Mfr 8 D Mfr 9 D Mfr 9 D Mfr 2 D Mfr 2 D Mfr 10 D Mfr 3 D Mfr 3

enclosed enclosed enclosed enclosed enclosed enclosed partially enclosed partially enclosed partially enclosed partially enclosed partially enclosed partially enclosed partially enclosed

## F DOORS AND HARDWARE THAT PASSED PREVIOUS MISSILE IMPACT TESTS

D Mfr 4

partially enclosed

## D Mfr 5 D Mfr 7 D Mfr 7 D Mfr 7 D Mfr 7 W Mfr 3 W Mfr 3 W Mfr 3 W Mfr 3

partially enclosed partially enclosed partially enclosed partially enclosed partially enclosed partially enclosed partially enclosed partially enclosed partially enclosed

W Mfr 11

partially enclosed

## DESIGN AND CONSTRUCTION GUIDANCE FOR COMMUNITY SAFE ROOMS

Testing Details refer to: http://www.wind.ttu.edu/Research/DebrisImpact/TestingLab.php Except where noted, all door frames are 14-gauge hollow metal. 1 Multi-point Locking Device 2 Rim Type Exit Device

SECOND EdITIon
{"found_math": false, "script_math_tex": 0, "script_math_asciimath": 0, "math_annotations": 0, "math_alttext": 0, "mathml": 0, "mathjax_tag": 0, "mathjax_inline_tex": 0, "mathjax_display_tex": 0, "mathjax_asciimath": 0, "img_math": 0, "codecogs_latex": 0, "wp_latex": 0, "mimetex.cgi": 0, "/images/math/codecogs": 0, "mathtex.cgi": 0, "katex": 0, "math-container": 0, "wp-katex-eq": 0, "align": 0, "equation": 0, "x-ck12": 0, "texerror": 0}