# CH. 2 LOADS ON BUILDINGS

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3 The limiting reduction is 40% for horizontal members and it cannot exceed the percentage determined by the following formula: R = 23.1(1+ D/L O ) R = (23.1)(1 + 72/50) R = 56.36% Of the three values, 6% is the least so the reduced live load will be: 50 (.06)(50) Reduced live load = 47psf Minimum roof live loads: prescribed by code and act on a horizontal projected area Nomenclature - A t Tributary roof area supported by structural member - R 1 Roof area reduction factor - R 2 Roof slope reduction factor - L r roof live load - F roof slope Roof live load, L r is given by the following: L r = 20R 1 R 2 - R 1 is based on the tributary area A t - If A t does not exceed 200ft 2, R 1 is If A t exceeds 600ft 2, R 1 is.6 - For values of A t between these two limits the following equation is used: R 1 = A t - The value of R 2 is based on the roof slope F in inches of rise per foot of run. - If F does not exceed 4 /ft, R 2 is If F exceeds 12 /ft, R 2 is.6. - For values of F between these two limits the following equation is used: R 2 = F Example 2.3: What roof live load should be used to design a column that supports 450ft 2 of a roof with a slope of 5 of rise per foot of run? Calculate the reduction for tributary area and slop and then find the design roof live load R 1 = A t R 1 = (450) R 1 =.75 R 2 = F R 2 = (5) R 2 =.95 L r = 20R 1 R 2 L r = 20(.75)(.95) L r = 14.25psf Since the calculated roof live load is greater than the minimum value of 12, use 14.3psf b/c value is heavier

6 Water Load developed from water is equal to the unit weight of the fluid in pounds per cubic foot multiplied by its depth Water weighs approx 62lbf/ft 3

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