In earthquake engineering, ductility is essential because
- AIt reduces material cost
- BIt enhances energy absorption capacityCorrect
- CIt improves workability
- DIt increases weight
Solution
Concept
Importance of ductility in seismic design
Step-by-step solution
1. During an earthquake a structure is subjected to cyclic inelastic deformation. 2. A ductile structure can deform plastically without collapse. 3. This dissipates energy and so improves the energy absorption capacity.
Explanation
Ductile members yield and dissipate seismic energy through hysteresis, avoiding brittle failure. This is why codes such as IS 13920 specify ductile detailing in reinforced concrete.
Shortcut
Ductility → energy dissipation → no sudden collapse.
Common mistake
Choosing a cost-related option.
Correct answer: B) It enhances energy absorption capacity