Experimental Study on the Reliability of an Active Unloading System for Strengthening of Reinforced Concrete Columns

Table 1

The test loading classification.

Load stage	Load case	Load amplitude (kN)
Preload stage	1	187
	2	349
	3	512
The first standard load stage	1	187
	2	349
	3	512
	4	837
	5	1,163
	6	1,488
	7	1,813
	8	2,138
	9	2,463
	10	2,626
	11	2,789
	12	2,951
	13	3,114
	14	3,276
The second standard load stage	1	349
	2	675
	3	837
	4	1,488
	5	2,138
	6	3,276