Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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Chapter 8, Problem 49P
To determine
Draw the influence lines for the force in member DE, CG, GH and BC.
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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
6-21 Four 3×3× 1/4 angles are used to form the member shown in the accompanying
illustration. The member is 24 ft long, has pinned ends, and consists of A572-Grade 50
steel. Determine the LRFD design strength and the ASD allowable strength of the
member. Design single lacing and end tie plates, assuming connections are made to the
angles with 3/4-in diameter bolts. (Ans. 159.1 k LRFD; 106.0 k ASD)
Figure P6-21
12 in
L
12 in
Chapter 8 Solutions
Structural Analysis
Ch. 8 - Prob. 1PCh. 8 - Prob. 2PCh. 8 - Prob. 3PCh. 8 - Prob. 4PCh. 8 - Prob. 5PCh. 8 - Prob. 6PCh. 8 - Prob. 7PCh. 8 - Prob. 8PCh. 8 - Prob. 9PCh. 8 - Prob. 10P
Ch. 8 - Prob. 11PCh. 8 - Prob. 12PCh. 8 - Prob. 13PCh. 8 - Prob. 14PCh. 8 - Prob. 15PCh. 8 - Prob. 16PCh. 8 - Prob. 17PCh. 8 - Prob. 18PCh. 8 - Prob. 19PCh. 8 - Prob. 20PCh. 8 - Prob. 21PCh. 8 - Prob. 22PCh. 8 - Prob. 23PCh. 8 - Prob. 24PCh. 8 - Prob. 25PCh. 8 - Prob. 26PCh. 8 - Prob. 27PCh. 8 - Prob. 28PCh. 8 - Prob. 29PCh. 8 - Prob. 30PCh. 8 - Prob. 31PCh. 8 - Prob. 32PCh. 8 - Prob. 33PCh. 8 - Prob. 34PCh. 8 - Prob. 35PCh. 8 - Prob. 36PCh. 8 - Prob. 37PCh. 8 - Prob. 38PCh. 8 - Prob. 39PCh. 8 - Prob. 40PCh. 8 - Prob. 41PCh. 8 - Prob. 42PCh. 8 - Prob. 43PCh. 8 - Prob. 44PCh. 8 - Prob. 45PCh. 8 - Prob. 46PCh. 8 - Prob. 47PCh. 8 - Prob. 48PCh. 8 - Prob. 49PCh. 8 - Prob. 50PCh. 8 - Prob. 51PCh. 8 - Prob. 52PCh. 8 - Prob. 53PCh. 8 - Prob. 54PCh. 8 - Prob. 55PCh. 8 - Prob. 56PCh. 8 - Prob. 57PCh. 8 - Prob. 58PCh. 8 - Prob. 59PCh. 8 - Prob. 60PCh. 8 - Prob. 61P
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