Question

A spiral column should be preferred if the axial load is greater than ________ times the balanced axial load.

(a) 0.25

(b) 0.4

(c) 0.85

(d) 0.96

I had been asked this question in unit test.

Question is taken from Earthquake Resistant R.C. Buildings in division Earthquake Resistant Buildings of Construction & Building Materials

Answer 1

The correct answer is:

(c) 0.85

A spiral column is generally preferred if the axial load exceeds 0.85 times the balanced axial load. This provides greater confinement to the concrete, enhancing the column's strength and ductility under seismic forces.