Planos_detalle_Refugios

8/13/2019 Planos_detalle_Refugios

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D-4

D CASE STUDY II SCHOOL COMMUNITY SAFE ROOM

DESIGN AND CONSTRUCTION GUIDANCE FOR COMMUNITY SAFE ROOMS

SECOND EDITION

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

GC pineg = -0.55 for partially enclosed buildings

Design Wind Pressure for Rigid Buildings of All Heights (Section 6.5.12.2.1 ofASCE 7-98 and ASCE 7-05)(for positive internal pressures)

pwi = (q z)(G)(C p ) (q h)(GC pipos ) p wi = 7.68 windward wall

p lee2a = (q z)(G)(C p2a ) (q h)(GC pipos ) p lee2a = - 8.73 leeward wall (wind parallel to ridge)

p lee2b = (q z)(G)(C p2b ) (q h)(GC pipos ) p lee2b = - 32.60 leeward wall (perpendicular to ridge)

p side = (q z)(G)(C p3) (q h)(GC pipos ) p side = - 55.72 side wall

p roof = (q z)(G)(C p4) (qh)(GC pipos ) p roof = - 78.84 roof pressures (0 4 ft from windwardedge)

p roof2 = (q z)(G)(C p5) (q h)(GC pipos ) p roof2 = - 32.60 roof pressures ( 4 28 ft from windwardedge)

p roof3 = (q z)(G)(C p6) (q h)(GC pipos ) p roof3 = - 09.48 roof pressures (more than 28 ft fromwindward edge)

(for negative internal pressures)

pwi = (q z)(G)(C p ) (q h)(GC pineg ) p wi = 67.28 windward wall

p lee2a = (q z)(G)(C p2a ) (q h)(GC pineg ) p lee2a = 30.87 leeward wall (wind parallel to ridge)

p lee2b = (q z)(G)(C p2b ) (q h)(GC pineg ) p lee2b = 7.00 leeward wall (perpendicular to ridge)

ATMOSTPHERIC PRESSURE CHANGE (APC)

The internal pressure coef cient, GC pi, may be taken as 0. 8 when venting area of squarefoot per ,000 cubic feet of interior safe room volume is provided to account for APC. As analternative to calculating the effects of APC, and designing an appropriate venting systemfor the safe room, the design may be completed using an internal pressure coef cient GC pi = 0.55 as a conservative means to account for APC.

ATMOSTPHERIC PRESSURE CHANGE (APC)

The internal pressure coef cient, GC pi, may be taken as 0. 8 when venting area of squarefoot per ,000 cubic feet of interior safe room volume is provided to account for APC. As analternative to calculating the effects of APC, and designing an appropriate venting systemfor the safe room, the design may be completed using an internal pressure coef cient GC pi = 0.55 as a conservative means to account for APC.


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E-

E WALL SECTIONS THAT PASSED PREVIOUS MISSILE IMPACT TESTS


SECOND EDITION


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E-3



SECOND EDITION

4-inch concrete block in a 2x6 studwall with 1 inches polystyrene betweenblock and two layers of -inch CDgrade plywood

Double 2x4 stud wall with 4 layers of-inch CD grade plywood and14-gauge steel on the back face

Double 2x4 stud wall with 4 layers of-inch CD grade plywood and14-gauge steel on the back face

4 layers of -inch plywood with14-gauge steel insert with spacersbetween the insert and the back face

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

The target was impacted next to a stud.Several heads of screws were poppedoff the back of the target. The steel had1 inch of deformation.

The target was impacted on the studline. The stud was cut in two. Nodeformation was visible on the backside.

The missile penetrated the target 1-2inches. A crack in the plywood on theback face caused bending, but total

separation did not occur.

2x4 stud wall with CD grade plywood,

14-gauge -inch expanded metal, andconcrete infill

2x4 stud wall with CD grade plywood,14-gauge -inch expanded metal, andconcrete infill

2x4 stud wall filled with concrete withno plywood and 14-gauge -inchexpanded metal on the non-impactface

2x4 stud wall filled with concrete withno plywood and 14-gauge -inch

expanded metal on the non-impactface

2x4 stud wall filled with concrete withno plywood and 14-gauge -inchexpanded metal on the non-impactface

The missile impacted 4 inches to the

left of a stud. No damage was visibleon the back of the target.

The missile impacted 1 inches to theleft of a stud. No damage was visibleon the back of the target.

The missile imade partial contact withthe stud. The concrete was crackedaround the impact area.

The missile imade partial contact withthe stud. The concrete was severely

damaged, and a 4-inch deflection onthe back of the target was observed.

The missile impacted the concrete. Nodamage was visible.


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E-



SECOND EDITION


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E-5



SECOND EDITION


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F-3

F DOORS AND HARDWARE THAT PASSED PREVIOUS MISSILE IMPACT TESTS


SECOND EDITION


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F-4



SECOND EDITION


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F-5



SECOND EDITION


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