39.11. Plastic Hinges and Their Role in Ductility

Try these first

1. 1.

   What is a plastic hinge?

   Hint

   Think about where in the structure flexibility is needed.

2. 2.

   Why is ductility important in seismic design?

   Hint

   Consider what happens to buildings during earthquakes.

3. 3.

   What are plastic hinges primarily used for?

   • Absorbing energy
   • Increasing building weight
   • Creating torsion
   • Promoting sudden failure

   Hint

   Focus on their function during earthquakes.

4. 4.

   True or False: Plastic hinges can form in both beams and columns.

   • True
   • False

   Hint

   Think about where you want failure to occur.

5. 5.

   Propose a design for a multi-story building that incorporates plastic hinges effectively. Explain your reasoning for hinge placement and overstrength considerations.

   Hint

   Think about structural locations under stress during an earthquake.

6. 6.

   Analyze a failed structure where plastic hinges were misplaced. What design flaws might have led to this failure, and how would you rectify them?

   Hint

   Consider common mistakes in hinge design.