Stiffness Analysis of Recycled Self-Compacting Concrete-Filled Circular Steel Tubular Columns under Eccentric Compression

Table 7

Comparisons of the deflection values predicted by the proposed equation and test data of the reference.

Specimen ID	Proposed model (mm)	Test data (mm)
CL12-8-100-20	5.156	5.064	1.01
CL12-8-100-40	6.366	6.499	0.98
CL32-8-100-20	14.783	13.794	1.07
CL32-11-100-20	16.662	13.914	1.19
CL32-14-100-20	14.000	16.277	0.86
CL32-8-50-20	13.800	13.345	1.03
CL32-8-0-20	12.572	12.711	0.99
CL32-8-100-40	16.213	13.154	1.23
CL32-8-50-40	16.225	12.176	1.31
CL32-8-0-40	14.311	12.034	1.18
CL48-8-100-20	22.210	18.409	1.20
CL48-8-100-40	19.000	19.412	0.98
Mean square error	—	—	0.133
Average value	—	—	1.086

Note. An example of the test specimen identification system is as follows: CL12-8-100-0, where CL accounts for a composite column with the aggregate, the digit number “12” is the length-diameter ratio (), the digit “8” defines the nominal ratio of 8%, the digit “100” represents the RCA replacement ratio of 100%, and the last one “0” denotes eccentricity of load with 0 mm.