ISBN: 0496082078 9780496082070

Category: Unavailable

Page count: 530

Experimental and analytical studies were conducted on six large scale concrete columns with double interlocking spirals. The primary test variables were the levels shear stress and the limits of the horizontal distance between the centers of the spirals. The specimens were tested under increasing amplitudes of the Sylmar record from the 1994 Northridge Earthquake, in the strong direction of the columns until failure. The tests revealed that the Caltrans upper spirals spacing limit of 1.5 times the radius is satisfactory even under high shear. However, supplementary cross ties are needed to prevent premature vertical shear cracking.