The 'ductility' of RC structures is improved under earthquake loading by:
Choose the correct answer
Using higher grade concrete only
Confinement hoops, under-reinforced sections, strong column-weak beam hierarchy, avoiding laps in hinge zones
Increasing rebar diameter only
Eliminating ties and stirrups for speed
Correct Answer
B. Confinement hoops, under-reinforced sections, strong column-weak beam hierarchy, avoiding laps in hinge zones
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Ductility in RCC: (1) Confinement reinforcement (IS 13920 — closely spaced hoops/spirals confine concrete, increase ductility in columns and joints); (2) Balanced or under-reinforced section (not over-reinforced); (3) Avoiding lap splices in plastic hinge zones; (4) Strong column — weak beam design (hierarchy of strength); (5) Avoiding abrupt changes in stiffness. Higher ductility = more energy absorption.
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