40.13. Torsional Irregularities and Code Provisions

Try these first

1. 1.

   What is torsional irregularity?

   Hint

   Think about how different parts of a building move during seismic forces.

2. 2.

   What kind of irregularities can be classified as plan irregularities?

   Hint

   Consider the layout of the structures.

3. 3.

   What is a torsional irregularity?

   • A structural alignment issue
   • A difference in lateral displacement
   • A design flaw

   Hint

   Think about how buildings respond in earthquakes.

4. 4.

   Vertical irregularities can lead to which of the following effects?

   • True
   • False

   Hint

   Consider how a building's height and weight distribution impacts its stability.

5. 5.

   Consider a multi-story building with a soft storey on the ground level. What structural modifications would you recommend to minimize torsional reactions during an earthquake?

   Hint

   Think about strengthening the weakest points.

6. 6.

   Analyze a building with re-entrant corners. Propose a torsional design remedy to overcome its irregularities.

   Hint

   Evaluate ways to modify load paths.