PS3-08-solutions

# PS3-08-solutions - 1 The second story of the main building...

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CE166 - Fall 2008 Problem Set 3 Solutions Page 1 of 3 Professor Arpad Horvath Department of Civil and Environmental Engineering University of California, Berkeley Question 1 Part A t in days, A(t), D(t) in number of ships A(t) = 12t D 1 (t) = 2t from t = 0 to t = 1 D 2 (t) = 2 +8(t-1) from t = 1 to t = 4 D 3 (t) = 26 + x(t-4) from t = 4 to t = 11 Solve for x: A(11) = D 3 (11) 12(11) = 26 + x(11-4) then x = 15.1 ships/day to catch up Part B Total delay = 0.5(11)(12×11) 0.5(2)(1) 0.5(2 + 26)(3) 0.5(26 + 12×11)(7) Total delay = 130 days 0 20 40 60 80 100 120 140 0 1 2 3 4 5 6 7 8 9 10 11 Day Ships Total Delay Total Ships Arrived Total Ships Unloaded Total Delay = 130 days Part C Average delay = 130 days/(12×11) ships Average delay = 0.98 days/ship

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CE166 - Fall 2008 Problem Set 3 Solutions Page 2 of 3 Professor Arpad Horvath Department of Civil and Environmental Engineering University of California, Berkeley Question 2 This question can be answered using a variety of examples from the job site. Some reasonable answers include:
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Unformatted text preview: 1. The second story of the main building has a temporary cable barricade in place that protects workers from falling over the side. 2. Workers on the outside of the building near or on the roo f are required to “clip-in” to the temporary cable system as a precaution. 3. Hard hats to protect workers from falling objects. etc. CE166 - Fall 2008 Problem Set 3 Solutions Page 3 of 3 Professor Arpad Horvath Department of Civil and Environmental Engineering University of California, Berkeley Question 3 Calculate height: 4’ + 3’ + 10’ = 17’ Calculate load: 15,000 lbs + 400 lbs = 15,400 lbs From the figure for model 7260, for an angle of 25 o or less, with an 80’ radius, and a 17’ minimum height, the boom length can be 80’ or 90’. From the table, only an 80’ boom can lift 15,400 lbs at a 21 o boom angle. From the figure again, an 80’ boom at a 21 o boom angle can p ick at a height of 33’. Select an 80’ Boom...
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PS3-08-solutions - 1 The second story of the main building...

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