MSU ECE 390 - Antenna Collapse Presentation (5 pages)

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Antenna Collapse Presentation



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Antenna Collapse Presentation

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Pages:
5
School:
Michigan State University
Course:
Ece 390 - Ethics & Prof & Cont Issues

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Missouri City TX TV Antenna Collapse 1985 Based on Texas A M engineering ethics web site The Cast of Characters Antenna Engineering Inc Designed and built the antenna William Bill Harris President Harris recommended to Jordan that Antenna Engineering Inc not get involved with Riggers problems regarding lifting the antenna tower due to legal liability issues Harry Jordan Head of the Engineering Division Jordan told Riggers that they could not authorize removing the microwave baskets yet he also told Riggers that the engineering firm signed off responsibility once Riggers accepted their design plans Riggers Inc Contracted to assemble the antenna Frank Catch President Randall Porter Vice President Made initial call to Antenna Engineering Inc detailing the problems Riggers was having lifting the top antenna section with the microwave baskets on it Bob Peters Lead Lift One of the workers killed in the collapse Kevin Chapp Cable Operator Talked to Peters before the catastrophe asking about the safety of the operation The Problem Riggers Inc could not hoist the last antenna section using the lifting lugs that Antenna Engineering provided due to interference with microwave baskets Antenna Engineering refused permission for Riggers to remove the basket and reassemble after hoisting Analysis of the Antenna Lift MODEL RIGGERS THOUGHT WAS CORRECT Calculation of stress in bolts Total Antenna Weight 2 Total Bolt Cross sectional Area MODEL RIGGERS SHOULD HAVE USED FREE BODY DIAGRAM OF LIFTING BAR AND ANALYSIS OF RIGGERS SOLUTION Assuming that the angle that the tower hangs is relatively small which it was and that the bolts were about 1 foot apart and that the supporting channel was about 6 feet long the load in the bolts is actually a combination of direct shear as found previously plus the load due to the moment caused by the length of the channel Thus Sum of Moments about the bolt on the left end of the channel 0 Weight of antenna 6 feet Added force in bolt 1 foot such that



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