Size Effect on the Seismic Performance of High-Strength Reinforced Concrete Columns with Different Shear Span-to-Depth Ratios

Table 4

Details of specimens and bars.

Test no.	[mm]	[mm]	[mm]	[MPa]	Concrete cover [mm]		Stirrup	Longitudinal bar	[%]
WF-3-2	300	300	546	48.77	15	2.00	4A6@43	12C12	0.55
WF-5-2	500	500	910+300	48.77	25	2.66	4A10@71	12C20	0.55
WF-7-2	700	700	1274+300	48.77	35	2.47	4A14@100	12C28	0.55
WF-3-4	300	300	1092	49.67	15	4.00	4A6@43	12C12	0.55
WF-5-4	500	500	1820+300	49.67	25	4.66	4A10@71	12C20	0.55
WF-7-4	700	700	2548+300	49.46	35	4.47	4A14@100	12C28	0.55

WF-3-2: a flexural component subjected to cyclic loading (the corresponding numbers represent cross sectional dimensions of the specimen in hundreds of millimeters and shear span-to-depth ratio); and : cross sectional dimensions; : total height of the column and spherical hinge (+300 represents spherical hinge height); : axial compressive strength of the concrete. Shear span-to-depth ratio is given by , and is determined by , where is the required tensile or compressive steel area and is the effective depth of the column.