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Engineering Disasters

Engineering Disasters. Engineering Disasters. Tacoma’s Narrows Bridge- Resonance - The increase in amplitude of oscillation of an electric or mechanical system exposed to a periodic force whose frequency is equal or very close to the natural undamped frequency of the system.

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Engineering Disasters

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  1. Engineering Disasters

  2. Engineering Disasters • Tacoma’s Narrows Bridge- • Resonance - The increase in amplitude of oscillation of an electric or mechanical system exposed to a periodic force whose frequency is equal or very close to the natural undamped frequency of the system.

  3. Engineering Disasters • Teton Dam Failure • Breach - A gap or rift, especially in or as if in a solid structure such as a dike or fortification. • Erosion - material is worn away from the earth's surface. • Settlement of the soil, and seepage were found to be the main causes of the failure.

  4. Engineering Disasters • Korar Bridge • Increasing Deflection - The movement of a structure or structural part as a result of stress. • Stress - An applied force or system of forces that tends to strain or deform a body.

  5. Engineering Disasters • Snellville Billboards • Hooks Law/Newtons Law – In order for an object to remain in equilibrium, it must push back with the same force as being applied to it.

  6. Engineering Disasters • New World Hotel • Failure to follow building codes. • Corruption of the governmental bodies issuing permits. • Materials could not bare the load.

  7. Engineering Disasters • Silver City Bridge • Failure of pin suspension System. Bicycle chain idea! If one fails, the entire system fails.

  8. Engineering Disasters • Quebec Bridge • A grave error was made in assuming the dead load for the calculations at too low a value...This error was of sufficient magnitude to have required the condemnation of the bridge, even if the details of the lower chords had been of sufficient strength." • Dead load (Dead weight) - The unrelieved weight of a heavy, motionless mass. • Chord - A line segment that joins two points on a curve.

  9. Engineering Disasters • Iran Stadium • The load exceeded capacity of the structure. • Hooks Law/Newtons Law.

  10. Engineering Disasters • Walkway Collapse: • The change in design increased the load from 90 kN to 181 kN on the individual bolt. doubled the load, exceeded the capacity on the nut. • Example of conflicting engineers. Too many chefs spoil the soup!

  11. Engineering Disasters • Mianus River Bridge Collapse: • Pin failure: Corrosion-dissolution of bodies, either by an acid or a saline menstruum. • Infrequent inspection.

  12. Engineering Disasters • Tay bridge • Wind forces • inspection problems • The fall of the bridge was occasioned by the insufficiency of the cross bracing and its fastenings to sustain the force of the gale." • Vector - A force or influence.

  13. Engineering Disasters • Sunshine Skyway Bridge Collapse • Poor Planning: • Traffic on Tampa Bay • Should be designed withstand the potential of a collision with a vessel.

  14. Engineering Disasters • South Fork Dam Collapse: • Poor Planning: The water exceeded the level of the dam. Once the water level rose to that height, it cut through the earthen dam like a knife. • Saturated the material. • Water permeated the material.

  15. Engineering Disasters • Arroyo Pasajero Bridge • Scour ; to carry away or remove, as by a current of water; -- often with off or away • Footings need to go to the bedrock. • Bedrock: solid un-weathered rock lying beneath surface deposits of soil

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