STRUCTURAL ANALYSIS W/MOD MAST
STRUCTURAL ANALYSIS W/MOD MAST
10th Edition
ISBN: 9780134863375
Author: HIBBELER
Publisher: PEARSON
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Chapter 6, Problem 6.46P
To determine

Influence line diagram for the force in member BC.

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Average sludge production reported by members of the National Association of Clean Water Agencies is 0.7 tons of sludge TS per MG wastewater treated. Assume that the organic matter (VS) in the sludge contains 10% N and that the ratio of VS/TS in sludge is 0.85. A) How many mg/L of N are removed from the wastewater due to assimilation? B) If the raw wastewater contained 50 mg/L total N, what percent was removed via assimilation? C) Why is this a disappointing result in terms of nutrient recovery and reuse goals?
The two-part curve is from a BOD bottle test conducted over 50 days (i.e., ultimate UBOD). The nitrifying bacteria numbers grew to significance by Day-8.There is a lower cBOD curve and an upper nBOD curve. BOD₁ = UBOD (1− e−k₁t) A) What is the rate constants k for cBOD? B) What is the rate constants k for nBOD? C) Why aren't nitrifiers prevalent in the raw wastewater? Treatment ponds have long hydraulic residence times (HRTs), so nitrifiers are a significant part of the microbiome. D) Sketch a 50-d BOD curve similar to the above, but for a pond effluent sample. The sum of the c and n BODs at 50 days is 30 mg/L. E) Why does your curve have the shape you give it? 100 80 BOD, mg/L 60 60 40 40 20 20 0 0 10 20 30 40 40 Time, d 50 60
6-19 Determine the LRFD design strength and the ASD allowable strength of the section shown if snug-tight bolts 3 ft on center are used to connect the A572-Grade 50 angles. The two angles, 5×31/2 × 5/16, are oriented with the long legs back-to-back (2 L5 × 31/2 × 5/16 LLBB) and separated by 3/8 inch. The effective length, (Lc)x = (Lc)y = (Lc)z = 14 ft. (Ans. 65.4 k LRFD; 43.5 k ASD) Figure P6-19 x x 2L5×32×5/16 LLBB

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STRUCTURAL ANALYSIS W/MOD MAST

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