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3.Exposure Categories:(ASCE 7-10,section 26.7.3) <br /> Ex�osure B: <br /> Exposure B shall apply where the ground surface roughness condition,as defined by Surtace <br /> Roughness B,prevaiis in the upwind direction for a distance of at least 2,600 ft.or 20 times <br /> the height of the building,whichever is greater. <br /> EXCEPTION: For buildings whose mean roof height is less then or equal to 30 ft the <br /> upwind distance may be reduced to 1,500 ft. <br /> Ex�osure C: <br /> Exposure C shall apply for all cases where Exposure B or D do not apply. <br /> Exoosure D: <br /> Exposure D shall apply where the ground surface roughness,as defined by Surtace <br /> Roughness D,prevails in the upwind direction for a distance greater then 5,000 ft or 20 times <br /> the building height,whichever is greater.Exposure D shall extend into downwi <br /> IFor a site located in the transition zone between exposure categories,the category resulting in the largest <br /> wind forces shall be used. <br /> EXCEPTION: An intermediate exposure between the preceding categories is <br /> permitted in a transition zone provided that it is determined by a rational <br /> analysis method defined in the recognized literature. <br /> 4.Velocity Pressure Coefficient Kh(ASCE 7-10,Table 26-3) <br /> EXPOSURE CHOSEN B <br /> Height= 18.00 n <br /> K„: Exposure <br /> Height,z B C D <br /> (ft) Case 1 Case 2 Both Case Both Cases <br /> 0-15 0.7 0.57 0.85 1.03 <br /> 20 0.7 0.62 0.9 1.08 <br /> 25 0.7 0.66 0.94 1.12 <br /> 30 0.7 0.7 0.98 1.16 <br /> 40 0.76 0.76 1.04 1.22 <br /> 50 0.81 0.81 1.09 1.27 <br /> 60 0.85 0.85 1.13 1.31 <br /> 70 0.89 0.89 1.17 1.34 <br /> 80 0.93 0.93 1.21 1.38 <br /> 90 0.96 0.96 1.24 1.4 <br /> 100 0.99 0.99 1.26 1.43 <br /> 120 1.04 1.04 1.31 1.48 <br /> 140 1.09 1.09 1.36 1.52 <br /> 160 1.13 1.13 1.39 1.55 <br /> 180 1.17 1.17 1.43 1.58 <br /> 200 1.2 1.2 1.46 1.61 <br /> 250 1.28 1.28 1.53 1.68 <br /> 300 1.35 1.35 1.59 1.73 <br /> 350 1.41 1.41 1.64 1.78 <br /> 400 1.47 1.47 1.69 1.82 <br /> 450 1.52 1.52 1.73 1.86 <br /> 500 1.56 1.56 1.77 1.89 <br /> Case 1: a.Ail components and cladding <br /> b.Main wind force resisting system in low-rise buildings designed using Figure 6-10 in ASCE 7-10 <br /> Case 2: b.All main wind force resisting systems in buildings except those in low rise buildings designed using <br /> Figure 6-10 in ASCE 7-10 <br /> b.All main wind force resisting systems in other structures <br /> JOB N0: Able Energy Sheet 4 <br /> NAME: Robb Residence <br />