1、= 3515787 0217170 T42 c-bo-O? ARMY TM 5-809-8 AIR FORCE AFM 88-3, Chap. 8 METAL ROOFING AND SIDING DEPARTMENTS OF THE ARMY AND THE AIR FORCE MARCH 1984 0790 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-m 3535789 0237373 989 m TM 5-809-8lAFM 88-3,
2、Chap. 8 I REPRODUCTION AUTHORIZATION/RESTRICTIONS This manual has been prepared by or for the Government and, except to the extent indicated below, is pub- lic property and not subject to copyright. Copyrighted material included in the manual has been used with the knowledge and permission of the pr
3、o- prietors and is acknowledged as such at point of use. Anyone wishing to make further use of any copy- righted material, by itself and apad from this text, should seek necessary permission directly from the proprietors. Reprints or republications of this manual should include a credit substantiall
4、y as follows: “Joint Depart- ments of the Army and Air Force USA, Technical Manual TM 5-809-8/AFM 883, Chapter 8, Metal Roof- ing and Siding. If the reprint or republication includes copyrighted material, the credit should also state: “Anyone wishing to make hirther use of copyrighted material, by i
5、tself and apart from this text, should seek necessary per- mission directly from the proprietors.” o79 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3535789 0237L72 815 *TM 5-809-8IAFM 88-3, Chap. 8 TECHNICAL MANUAL NO. 5-809-8 AIR FORCE MANUAL A
6、FM 88-3, CHAPTER 8 DEPARTMENTS OF THE ARMY AND THE AIR FORCE WASHINGTON, DC, 5 March 1984 METAL ROOFING AND SIDING Purpose . Definitions . . . Basis for Design . Design Stresses . Design Loads . Design Requirements Determination of Minimum Required Section Properties for Corrugated Sheets . Determin
7、ation of Actual Section Properties of Available Corrugated Sheets . I . . Load Test Data Overseas Construction Appendix A: Factors for Moment of Inertia of Corrugated Curved Sheets Appendix B: References Paragraph 1 2 3 4 5 6 7 8 9 10 Page 1 1 1 1 1 2 2 3 4 4 1. Purpose This manual prescribes the cr
8、iteria and procedures for the design of metal roofing and siding for build- ings of military construction. 2. Definitions Metal roofing and siding are cold-formed corruga- ted metal sheets designed to support loads perpen- dicular to the plane of the sheets. Normally the sheets are used in all-metal
9、 structures and are in- stalled exposed to the weather. Roofing as defined in the manual will not be construed as roof decking nor sheet metal roofing to be placed on sheathings. The various types of corrugated configurations vary with each manufacturer. a. Regularly curved sheets. Sheets that have
10、conventional, smooth, regular corrugations sym- metrical about the neutral axis regardless of depth or curved shape. Shapes may be parabolic, sinu- soidal or any other arc-tangent type continuous curve. b. Regularly folded sheets. Sheets that have cor- rugations with right-angled or slanted webs fol
11、ded with or without flats symmetrical about the mid- depth axis regardless of depth or shape. Corruga- tions may be rectangular, trapezoidal such as the ribbed type, triangular as the V-beam type, or any other equally folded continuous configuration. c. Irregularly folded sheets. Sheets with right-a
12、ngled or slanted webs folded with different flat widths at the top and bottom or with flats only at the top or bottom. Depths will be uniform on major corrugations with intermediate stiffened cor- rugations permitted. The basic complete pitch of the corrugated system will be repeated regularly. 3. B
13、asis for design Unless otherwise prescribed herein, the design of roofing and siding will be in accordance with the following: a. Steel. The American Iron and Steel Institute (AISI), “Specification for the Design of Cold- Formed Steel Structural Members”. b. Aluminum. The Aluminum Association, “Spec
14、ification For Aluminum Structures,” and “Aluminum Formed-Sheet Building Sheathing De- sign Guide.” 4. Design stresses The minimum yield stresses and design moduli of elasticity to be used as a basis for design will be as follows: Steel: Fy = 33,000 psi E = 29.510 psi Aluminum: Fy = 27,000 psi E = 10
15、.110 psi The above mechanical properties for steel are based on ASTM A 570, Grade 33, and A 611, Grade C; and for aluminum alloy are based on Alclad 3004 H36. 5. Design loads The roofing and siding will be designed to support *This manual supersedes TM 5-809-8/AFM 88-3, Chapter 8, 15 July 1974 0792
16、1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-35L578 02L7L73 751 Minimum Resisting Moment Required (in. ibs./ft. width) TM 5-809-8JAFM 88-3, Chap. 8 Minimum Moment of Inertia per ft of width = I min. (inch4/ft.) Minimum Section Mod- ulus per ft.
17、of width = S min. (inchs/ft.) dead, live, and wind loads in accordance with TM 5-809-1/AFM 88-3, Chapter 1. Midspan deflec- tions under maximum design load will be limited to the values stated below. Design of roofing will in- clude consideration of the effects of the maximum allowable deflection of
18、 roofing under maximum de- sign loads. The maximum net inward and outward loads used in the design will be indicated on the drawings. 6. Design requirements The design of roofing and siding will conform to the design specifications and guidance referenced in paragraph 3 except as modified herein, a.
19、 Deflection. To insure watertightness and meet other requirements, the maximum deflections of roofing and siding under full dead, live and/or wind loads will not exceed 1/80th of the span (LBO) assuming sheets are unfastened and free to deflect. b. Thickness. The minimum thickness of sheets will be
20、as follows: Roofing Siding Aluminum .O32 inch .O32 inch Steel-plain, 24 gage 24 gage painted protected c. Roof slopes. Metal roofing will not be used on slopes less than 3 inches on 12 inches except as follows: (i) On slopes of 2 to 3 inches on 12 inches if height of all corrugations and/or interloc
21、king seams is 1 inch or more. (2) On slopes of 1 to 2 inches on 12 inches if height of all corrugations and/or interlocking seams is 2 inches or more or proven sealing systems are provided; however, in all uses slopes must be steep enough to insure a slight positive slope at every point on the roof
22、when it is deflected under full dead and live loads. d. Spacing of supports and length of sheets. Sup- ports for corrugated roofing and siding sheets will be laid out to provide equal or approximately equal multi-span conditions insofar as practicable consid- ering maximum length of sheet at 30 feet
23、 for Army facilities, and 25 feet for Air Force facilities. Sheets in excess of 30 feet, although available, re- quire design provisions for thermal expansion and contraction. 7. Determination of minimum required section properties for corrugated sheets The minimum required values of section propert
24、ies per foot width of corrugated sheets for single-span, two span, and three or more span con- ditions as applicable will be indicated on the draw- ings. For the usual roofing and siding applications, the section properties that must be indicated are the minimum effective moment of inertia per foot
25、width, the minimum thickness of sheets, and mini- mum section modulus per foot width for both alu- minum and steel sheets if an option is allowed. A suggested presentation of necessary information and data on the drawings is as follows: DESIGN AND PROPERTY DATA FOR CORRUGATED ROOFING AND SIDING Crit
26、ical Uniform Load and Span Condition (psf and inch) Roofing: Span - inches - psf down (dead + live) psf up (wind) _ span condition Siding: Span inches psf in (wind) - psf out (wind) span condition - positive negative - positive negative - positive - negative - positive - negative Minimum Sheet thick
27、- ness (gage or inch) 24 gage steel .O32 inch aluminum 24 gage steel .O32 inch aluminum e e Unless otherwise indicated, the strength and de- flection properties of roofing and sliding will be de- termined by: Steel-AISI, “Specification for the Design of Cold-Formed Steel Structural Members.” Guide.
28、” Thickness used will be that of unclad sheets. Fy = 33,000 psi E = 29.510 psi Aluminum-The Aluminum Association, “Specifi- cations for Aluminum Structures”, and “Alumi- num Formed-Sheet Building Sheathing Design Fy = 27,000 psi E = 10.110 psi 2 OP93 Provided by IHSNot for ResaleNo reproduction or n
29、etworking permitted without license from IHS-,-,-3515789 0237374 698 W TM 5-809-8lAFM 88-3, Chap. 8 The Blodgett formulas presented in paragraph b.(l)(a) below may be used to determine the sec- tion properties of regularly curved sheets. In some special cases, the corrugated roofing and siding may b
30、e required to perform additional structural functions, e.g., provide diaphragm action when subject to design loads. The structural evaluations and design of corrugated sheets in most special cases will be based on criteria described herein as applicable and on sound engineering principles. De- sign
31、of diaphragms for earthquake areas will con- Chapter 13, Seismic Design for Buildings. The min- imum required section properties will be deter- mined by the following criteria: a. Minimum required moment of inertia. For the usual case, where the design load is a uniformly distributed load, the minim
32、um required effective moment of inertia per foot width, I, for a deflection limit of span, d, divided by 80 is determined by the following formulas: * form to TM 5-809-10/NAVFAC P-355/AFM 88-3, (i) Single span: I = 1.04 w13 E (eq 1) (2) Two equal spans: I = .43 w13 E (eq 2) (3) Three or more equal I
33、 = .55 w13 a spans: E (eq 3) I = Effective moment of inertia, in.4, per E = Modulus of elasticity, psi. w = Total uniformly distributed design load, pounds per linear inch per foot width (pli/foot width) inch. foot of width. 1 = Span, center to center of supports, b. Minimum requi,red section modulu
34、s. These values will be determined by dividing the maxi- mum moment resulting from critical design loads by the allowable stresses. The allowable design stresses will be based on the maximum allowable stresses for the specific metal which will provide the minimum effective section modulus. c. Select
35、ion of sheets. For proper selection of sheets, the minimum required section properties, both the section modulus and moment of inertia, must be satisfied. 8. Determination of actual section properties of available corrugated sheets a. General. To ensure complete compliance with design criteria presc
36、ribed in this manual and to provide economical design and equitable section properties of various available corrugated sheets * will be determined in accordance with the proce- dures listed below. b. Section properties. Section properties will be based on unclad sheet. The moment of inertia and sect
37、ion modulus of various corrugated sheets may be determined by any of the methods specified below: (i) Regularly curved sheets. (a) Section propeties may be determined in accordance with the following formula derived by Professor H. B. Blodgett (from AISI, Sectional Propeties of Corrugated Steel Shee
38、ts, used with permission). s = 21 d+t Where I =Moment of inertia, in.4/ft. of width. S = Section modulus, h./ft. of width. b =Width, (12 inches). t = Thickness of sheet, inches. d =Depth, inches (distance from top surface of crest of corrugation to the top surface of valley of corru- gation). C5 and
39、 c6 = Factors depending on shape of corrugations. Values of C5 and c6 may be determined from Fig- ures A-1, A-2, and A3 in Appendix A. For most pitch-to-pitch ratios and web angles, the first term of the formula above for “I” may be neglected. Ac- ceptable values of moment of inertia and section mod
40、ulus of several types of corrugated steel sheets are tabulated in “Sectional Properties of Corruga- ted Steel Sheets. (b) Section properties may be determined in, accordance with the “linear method” in the AISI Supplementary Information of the Specification For the Design of Cold-Formed Structural S
41、teel Members. (c) When corrugation pitch (distance from center to center of corrugation) equals 2.67 inches and the total depth (d+t) equals 7/8 inch, the sec- tion properties may be computed by the following formulas: I =0.15bd2t (eq 6) (eq 5) s = 21 d+t (2) Regularly and irregularly folded sheets.
42、 (a) Section properties of steel sheets will be computed in accordance with AISI “Supplementary Information of the Specification for the Design of Cold-Formed Structural Steel Members” or by 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3535789 T
43、M 5-809-8iAFM 88-3, Chap. 8 other conventional methods based on full cross sec- tion per foot of width except where the use of the “effective design width” concept is required. The effective design width will be determined in ac- cordance with AISI “Specification for the Design of Cold-Formed Steel
44、Structural Members.” The maximum compression stress, f, to be used for de- termination of the effective width under “load de- termination” in Section 2.3.1.1 of the AISI specifi- cation will be taken as the actual stress under the design dead plus live load but not more than 20,000 psi maximum, rega
45、rdless of the actual stress and regardless of the increase of allowable stresses for Corrugated Roofing and V-Beam Roofing and Siding, Siding 4 7f8” pitch Ribbed Siding, 4” pitch Ribbed Siding 8“ pitch V-Beam Roofing and Siding, 5 1/3” pitch 0217175 524 wind or seismic loads. For deflection, the eff
46、ective width under the “deflection determination” formula will be used at the maximum computed compress- ive stress when unfastened sheet is subjected to the maximum design moment. (b) Section properties of aluminum sheet will be computed by conventional methods based on full cross section per foot
47、of width except for deflection where the effective width concept will be used as required in accordance with the Aluminum Associ- ation “Specification for Aluminum Structure. Ac- ceptable section properties of various available alu- minum building products are tabulated in Table 1. Table I. Nominal
48、Section Properties of Aluminum Building Products Thickness, inch 0.032 0.040 0.032 0.040 0.050 0.032 0.040 O. 032 0.040 0.032 0.040 0.050 Weight Ib. per sq ft 0.552 0.689 0.584 O. 730 0.913 0.585 0.730 0.518 0.648 0.580 0.726 0.907 Area in.2 per ft of width 0.469 0.586 0.497 0.621 0.776 0.497 0.621
49、0.441 0.551 0.494 0.617 0.771 Moment of Inertia, in.4 per ft of width 0.0409 0.0512 O. 179 0.223 0.279 0.0836 0.104 0.0648 0.0810 o. 199 0.249 0.311 Minimum Section Modulus, in.: per ft of width O. 0936 0.116 0.205 O. 255 0.317 O. 160 0.198 O. 0895 0.111 0.229 0.285 0.354 Maximum Section dodulus, in.$ per ft of width 0.0936 0.116 0.205 0.255 0.317 O. 175 0.217 0.235 0.289 0.229 0.285 0.354 Radius of yration, in. 0.295 0.295 0.600 0.600 0.600 0.410 0.410 0.383 0.
