28.4.2. Definitions

Try these first

1. 1.

   What does the reliability index measure?

   Hint

   Think about how we assess safety.

2. 2.

   What is the formula for the safety margin?

   Hint

   Identify terms used in capacity and demand.

3. 3.

   What is a reliability index?

   • A measure of structural confidence
   • A construction method
   • A type of material

   Hint

   Remember how we evaluate structure performance.

4. 4.

   True or False: If the safety margin Y is less than zero, the structure has sufficient capacity.

   • True
   • False

   Hint

   Think about what it implies when Y < 0.

5. 5.

   A skyscraper has a capacity of 500 tons and experiences a demand of 550 tons at peak times. Calculate the safety margin and discuss potential actions needed.

   Hint

   Think about strategies for improving reliability.

6. 6.

   If a bridge's reliability index shows a significant risk factor and is rated at zero, what immediate steps should be taken by a structural engineer?

   Hint

   Consider what actions ensure public safety in this scenario.