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SECTION 1 SCREENED ENCLOSURES Table 1_1 Allowable Spans for Primary Screen Roof Frame Members Aluminum Alloy 6063 T-6 For Areas with Wind Loads up to 150 M.P.H. and Latitudes Below 30..30'~0" North (Jacksonville, FL) Tributary Load Width W' Beam Spacing Hollow Sections 3'.0" 4'~" 5'-0" 6'-0" I 7'..0" 8'-0" I 9'-0" Allowable Span 'L'I bending 'b' or deflection 'd' 2" x 2" x 0.044" 9'-10" b 8'-7" b 7'-8" b 6'.11" b 6'-6" b 6'-1" b 5'-8" b 2" x 2" x 0.055" 10'-9" b 9'-4" b 8'-4" b 7'-7" b 7'-1" b 6'.7" b 6'-3" b 2" x 3" x 0,045" 13'-4" b 11'.7" b 10'-4" b 9'.5" b 8'-9" b 8'-2" b 7'-8" b 2" x 4" x 0.050" 14'-8" b 12'-8" b 11'-4" b 10'-4" b 9'-7" b 8'-11" b 8'-5" b Tributary Load Width W' - Beam Spacing Self Mating Sections 3'.0" 4'.0" I 5'.0" 6'~" I 7'~" 8'..0" 9'.0" Allowable Span 'L'I bending 'b' or deflection 'd' 2" x 4" x 0.044 x 0.100" 19'-11" b 17'-4" b 15'-8" b 14'-2" b 13'-1" b 12'-3" b 11'-8" b 2" x 5" x 0,050" x 0.100" 24'.9" b 21'-5" b 19'-2" b 17'-6" b 16'-2" b 15'-2" b 14'.3" b 2" x 6" x 0.050" x 0.120" 28'-7" b 24'-9. b 22'-2" b 20'-3" b 18'-9" b 17'-8" b 16'-6" b 2" x 7" x 0.055" x 0.120" 32'-3" b 27'-11" b 24'-11" b 22'-9" b ,21'_1" b 19'-9" b 18'-7" b 2" x 7" x 0.055" wI insert 42'-10" b 37'-1" b 33'-2" b 30'-4" b 28'-1" b 26'-3" b 24'-9" b 2" x 8" x 0.072" x 0.224" 41 '.7" b 36'-1. b 32'-3" b 29'.5" b 27'-3" b 25'-8" b 24'-0" b 2" x 9" x 0.072" x 0,224" 45'-1" b 39'-1" b 34'-11" b 31'-11" b 29'-6" b 27'-8" b 26'-1" b 2" x 9" x 0,082" x 0.310" 49'-8" b 42'-11". b 3S'-4" b 35'-0" b 32'-5" b 30'-4" b 28'-7" b 2" x 10" x 0.092" x 0.369" 59'-8" b 51'-7" b 46'-1" b 42'-1" b 3S'-11" b 36'-5" b 34'-4" b Tributary Load Width W' - Beam Spacing Snap Sections 3'.0" I 4'-0" I 5'.0" I 6'-0" 7'-0" I 8'-0" 9'-0" Allowable Span 'L'I bending 'b' or deflection 'd' 2" x 2" x 0.044" 11'.9" b 10'-2" b 9'-1" b S'-4" b 7'-8" b 7'-2" b 6'-9" b 2" x 3" x 0.045" 15'-1" b 13'-1" b 11'-8" b 1 0'-8" b 9'-10" b 9'-3" b 8'.8" b 2" x 4" x 0.045" 18'.5" b 15'.11" b 14'-3" b 13'-0" b 12'-1" b 11'-3" b 10'-8" b 2" x 6" x 0.062" 31'-3" b 27'-1" b 24'.2" b 22'-1" b 20'-5" b 19'-2" b 18'-0" b 2" x 7" x 0.062" 34'-9" b 30'-1" b 26'-11" b 24'-7" b 22'-9" b 21'-3" b 20'-1" b Note: 1. Thicknesses shown are "nominal. industry standard tolerances. No wall thickness shall be less than 0.040". 2. The structures designed using this section shall be limited to a maximum combined span and upright height of 55' and a maximum upright height of 20'. Structures larger than these limits shall have site specific engineering. 3. Spans are based on a minimum of 10# I Sq. Ft. for up to a 150 M.P.H. wind load. 4. Span is measured from center of beam and upright connection to fascia or wall connection. 5. Above spans do not include length of knee brace. Add horizontal distance from upright to center of brace to beam connection to the above spans for total beam spans. 6. Purlin spacing shall not exceed 6'- 8". For beam spans greater than 40'.0" the beam at the center purlin and one purfin for each 14'-0" on each side of the center purlin shall include lateral bracing as shown in detail (48'-0") span with purfins at 6'- 8" o.c. center pur/in and (2) purlins each side of center purfin need latera' bracing. 7_ Spans may be interpolated. Example: Max. 'L' for 2" x 4" x 0.050" hollow section with W' = 5'-0" = 11'-4" Lawrence E. Bennett, P.E. FL # 16644 CIVIL ENGINEER - DEVELOPMENT CONSUl.. TANT P.O_ BOX 214368, SOUTH DAYTONA. FL 32121 TELEPHONE: (386) 767-4n4 FAX: (386) 767-6556 PAGE @ COPYRIGHT 2004 1-56 NOT TO BE REPRODUCED IN WHOLE OR IN PART WITHOUT THE WRITTEN PERMISSION OF LAWRENCE E. BENNEIT. P.E.