**TABLE 16.3: Lifting Capacities in Pounds for a Tower Crane (Continued)****Jib Model:**| Maximum Hook Reach | L1 | L2 | L3 | L4 | L5 | L6 | L7 | Hook Reach ||---------------------|----------|----------|----------|----------|----------|----------|----------|------------|| | 100' 9" | 119' 9" | 138' 9" | 157' 9" | 176' 9" | 195' 9" | 214' 9" | || | 55,200 | 55,200 | 55,200 | 55,200 | 55,200 | 55,200 | 55,200 | 13' 6" || | 55,200 | 55,200 | 55,200 | 55,200 | 55,200 | 55,200 | 52,500 | 48' 9" || | 55,200 | 55,200 | 55,200 | 55,200 | 55,200 | 51,400 | | 51' 0" || | 55,200 | 55,200 | 55,200 | 55,200 | 51,500 | 48,300 | 45,600 | 53' 6" || | 55,200 | 55,200 | 55,200 | 50,700 | 47,100 | 44,600 | 42,100 | 60' 6" || | 46,200 | 46,200 | 46,200 | 42,800 | 39,700 | 37,400 | 35,200 | 70' 0" || | 39,400 | 39,400 | 39,400 | 36,500 | 34,100 | 31,900 | Low Ball Construction Co. has determined that the heaviest load to be lifted on one of its projects weighs 22,000 lbs. From the tower crane location on the building site, the required reach for this lift will be 100 ft. The crane is equipped with an L7 jib and a four-part hoist line (Table 16.3 load chart). This critical lift is of a piece of mechanical equipment and will require a 1,000-lb spreader bar attached to a 200-lb set of slings. If assembled in the proposed configuration, can the crane safely make the pick?

Given: load to be lifted = 22,000 lbs Height to be lifted = 100 ft Equipment = L7 jib Spreader bar = 1000 lb Slings attached to the bar = 200 lb To find: The crane can safely make the pick.Solution: From the given table For L7 jib and a four-part hoist line: for the hook reach of 100 feet. The maximum load that the crane can carry is 22,600 lbs The load that needs to carry along with the spreader and slings: Total load = 22,000+1000+200=23200 lb 23200>22600 Since the load that needs to carry is greater than the given limit. Hence the crane cannot safely make the pick.Answer: The crane cannot safely make the pick. Total load that needs to carry> Maximum load that crane can carry at 100 ft23200>22600

Engineering

Civil Engineering

Low Ball Construction Co. has determined that the heaviest load to be lifted on one of its projects weighs 22,000 lbs. From the tower crane location on the building site, the required reach for this lift will be 100 ft. The crane is equipped with an L7 jib and a four-part hoist line (Table 16.3 load chart). This critical lift is of a piece of mechanical equipment and will require a 1,000-lb spreader bar attached to a 200-lb set of slings. If assembled in the proposed configuration, can the crane safely make the pick?

Low Ball Construction Co. has determined that the heaviest load to be lifted on one of its projects weighs 22,000 lbs. From the tower crane location on the building site, the required reach for this lift will be 100 ft. The crane is equipped with an L7 jib and a four-part hoist line (Table 16.3 load chart). This critical lift is of a piece of mechanical equipment and will require a 1,000-lb spreader bar attached to a 200-lb set of slings. If assembled in the proposed configuration, can the crane safely make the pick?

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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