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Explain the term factor of safety with reference to the design and manufacture of a pedestrian foot bridge. - Leaving Cert Engineering - Question k - 2016
Question k
Explain the term factor of safety with reference to the design and manufacture of a pedestrian foot bridge.
Worked Solution & Example Answer:Explain the term factor of safety with reference to the design and manufacture of a pedestrian foot bridge. - Leaving Cert Engineering - Question k - 2016
Step 1
Definition of Factor of Safety
Answer
A factor of safety is defined as the ratio between the maximum load that a structure can withstand and the actual load it is designed to carry. This serves as a safety margin to account for uncertainties in material properties, loads, and environmental conditions.
Step 2
Application in Pedestrian Footbridge Design
Answer
In the design of a pedestrian footbridge, engineers must consider various factors such as excessive weight from pedestrians, potential additional loads like bicycles, and environmental factors like wind and snow. The factor of safety ensures that the bridge can support these loads beyond the expected maximum to prevent structural failure.
Step 3
Over Design Consideration
Answer
Designing a bridge with an appropriate factor of safety may lead to what is called 'over design,' where the structure is built more robustly than necessary. This is often done to ensure longevity and to minimize the risks associated with unexpected events or loads.
Step 4
Consequences of Insufficient Safety
Answer
Failure to adequately implement a factor of safety can result in catastrophic failures, which could lead to loss of life and damage to the credibility of manufacturers. It is crucial in the construction industry to prioritize safety and reliability to maintain public trust.