Table 2.

Main parameters of specimens.

Specimen Designation	Steel Grade	Steel Ratio to Concrete	Dimensions of Steel (b × h × t1 × t2)	Stirrups Spacing	Section Form of Steel
A1Q4S3-H(A1)	Q460	3.13%	100 × 100 × 5 × 5	70	H
A2Q4S5-H(A2)	Q460	5.13%	100 × 106 × 8 × 5	70	H
A3Q4S6-H(A3)	Q460	6.20%	110 × 106 × 8 × 8	70	H
A4Q4S6-+(A4)	Q460	6.20%	50 × 106 × 8 × 5	70	+
A5Q6S3-H(A5)	Q690	3.13%	100 × 100 × 5 × 5	70	H
A6Q6S5-H(A6)	Q690	5.13%	100 × 106 × 8 × 5	70	H
A7Q6S6-H(A7)	Q690	6.20%	100 × 106 × 8 × 8	70	H
A8Q6S6-+(A8)	Q690	6.20%	50 × 106 × 8 × 5	70	+
A9Q2S3-H(A9)	Q235	3.13%	100 × 100 × 5 × 5	70	H
A10Q2S5-H(A10)	Q235	5.13%	100 × 106 × 8 × 5	70	H
A11Q2S6-H(A11)	Q235	6.20%	110 × 106 × 8 × 8	70	H
A12Q2S6-+(A12)	Q235	6.20%	50 × 106 × 8 × 5	70	+