40.13.1. Types of Irregularities (IS 1893 Clause 7.1)

Try these first

1. 1.

   Define plan irregularity.

   Hint

   Think about the horizontal layout of a building.

2. 2.

   What is a torsional irregularity?

   Hint

   It involves twisting caused by unequal movement.

3. 3.

   What is torsional irregularity?

   • A lack of vertical support
   • Uneven lateral displacement
   • Excessive weight at the top

   Hint

   It involves how a structure moves sideways during an earthquake.

4. 4.

   True or False: Geometric irregularities do not affect seismic performance.

   • True
   • False

   Hint

   Think about how shapes can impact stability.

5. 5.

   A multi-story building has a soft first floor and a heavy rooftop garden. Discuss the implications of these elements on the design strategy during an earthquake.

   Hint

   Consider how both elements affect lateral loads.

6. 6.

   Evaluate the potential risks of a building with re-entrant corners during an earthquake, including suggested design improvements.

   Hint

   Think about how shapes can influence stability.