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Task: WindLoading on Balcony Rails (Glass Infill) <br /> ASCE7-16, Chapter 29 Wind Loads on Other Structures and Building Appurtenances - MWFRS <br /> ASCE 7-16, $ection 29,3 applies to balcony railing as they are open on all sides and most similar to <br /> solid freestanding walls or signs. <br /> 29 3,1 Solid Freestanding: Walls and !Solid Freestanding <br /> Signs. The design wind force for solid freestanding walls and <br /> Solid freestanding signs shall be determined by the following <br /> formula: : <br /> ?=ghGCfA, lb .3- <br /> • <br /> F=ghGCfAs(N) (29.3-1.si) : <br /> where <br /> qh=velocity pressure evaluated at:height h(defined in Fig.29.341) , <br /> ' :as determined in accordance;with Section 26.10 : <br /> G=gust-effect factor from Section 26.11 i . <br /> t✓f net force coefficient from Fig.29 3 1.-- _ _ <br /> As=gross area of the solid freestanding wall or freestanding , <br /> solid sign, in ft2 (trt'). <br />• <br /> G = 0.85 (Section 26.11) Rigid building pr Other structure , <br /> Cf = 1.45 from Figure 29.3-1 (a= 48", s = 43', h=s Aspect ratio B/s = 1.1) , <br /> 26.10.2 Velocity Pressure. Velocity pressure.qz, evaluated at ; <br /> height z above ground shall be calculated by the following <br /> equation .. _.._. _._... <br /> i <br /> 9z=0.00256KZKZ,KdKeV2(1b/ft2); V in mi/h (26.10-1) - <br /> .. qz=0.613KZK=,KdKeV2-(N/xn2) V in'tn/s ( ) <br /> 26.10=i. <br /> Where <br /> Kz=verity pressure exposure coefficients see Section 26a0:1. <br /> Kz,=topographic factor; see Section 26.8.2. i ' <br /> Ka='wind directionality fac€or, see Section 26 6 - • <br /> Ke=ground elevation factor, see Section 26.9. <br /> V=basic wind speed, see Section 26.5. Example Caldfor'125 <br /> gz velocity pressure at height z.-- . 1 mph wind, Exp B, 20- <br /> The velocity__pressure_at _mean_.roof:height is computed ft-above-ground <br /> a °h', qz>- .. ., 1 ,o. i. ' ' : s' g a o.. <br /> height h. <br /> qh = 21.2 psf (Section 26.10.2) lc = 1, Kd = .85, K. = 0.625 (20 ft tall), V = 125 mph <br /> F = 21.2 psf * .85 * 1•.45 - 26.1 psf.{LRFD) or:261 *9.6 = 15.7 psf (ASD) * area <br /> Project Job no. <br /> James G. Pierson, Inc. Innovative Glass Railing System <br /> Consulting Structural Engineers LocationDate 3/30/20 <br /> Washington and Oregon <br /> 610 S.W.Alder,Suite 918 Portland,Oregon 97205 <br /> Tel: (503)226-1286 Fax: (503) 226-3130 Client Sheet no. <br /> Innovative Aluminum Systems, Inc. Page 5 of 12 <br />