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Please help with this practice question. Thanks Question 1 ) determine the counterweight J in order for the main jib DCB to be horizontal. (The units should be in kN)

Please help with this practice question. Thanks Question 1 ) determine the counterweight J in order for the main jib DCB to be horizontal. (The units should be in kN)

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Please help with this practice question. Thanks Question 1 ) determine the counterweight J in order for the main jib DCB to be horizontal. (The units should be in kN)
Item 2 2 of 6 Various geometry: hi = 26.9 m ha = 4.1 m hy = 5.6 m 1 = 11.3 m l2 = 15.1 m 1s = 4.8 m 0 = 62.3 degrees Assumptions: • The main body AEFG can be considered massless. • The cable CFGJ is massless. • The pulleys at F and G can be considered massless, frictionless, and of negligible diameter. All bodies are considered rigid. i. Determine the weight of counterweight J in order for the main jib DCB to be horizontal. ii. Determine the magnitude of the z and y components of force at pin D. i. Determine the reactions at fixed support A.
Transcribed Image Text:Item 2 2 of 6 Various geometry: hi = 26.9 m ha = 4.1 m hy = 5.6 m 1 = 11.3 m l2 = 15.1 m 1s = 4.8 m 0 = 62.3 degrees Assumptions: • The main body AEFG can be considered massless. • The cable CFGJ is massless. • The pulleys at F and G can be considered massless, frictionless, and of negligible diameter. All bodies are considered rigid. i. Determine the weight of counterweight J in order for the main jib DCB to be horizontal. ii. Determine the magnitude of the z and y components of force at pin D. i. Determine the reactions at fixed support A.
The main jib DCB (in green) has a weight of 25 kN concentrated in the center of the beam. This is pinned to the main body at D and is supported by a cable that is routed through pulleys at F and G and is attached to a concrete counterweight J. The structure shown below is a simplified tower crane. It carries a shipping crate suspended from B that has a weight of 97 kN. The main body AEFG (in yellow) is fixed to the ground at A. F h3 G E h2 B 12 13
Transcribed Image Text:The main jib DCB (in green) has a weight of 25 kN concentrated in the center of the beam. This is pinned to the main body at D and is supported by a cable that is routed through pulleys at F and G and is attached to a concrete counterweight J. The structure shown below is a simplified tower crane. It carries a shipping crate suspended from B that has a weight of 97 kN. The main body AEFG (in yellow) is fixed to the ground at A. F h3 G E h2 B 12 13
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