Optimal Evaluation of the Rheological Parameters for STF Dampers in Semi-Rigid Joints of Steel Structures Using Response Surface Method

Table 1

Process parameters and working range.

Factors	Level	Low level	High level
Load frequency (Hz)	1.75	0.8800	2.00
% of STF with oil	42.72	32.50	49.20
Initial viscosity (Pa.s)	39.56	32.00	50.00
Stiffener thickness (mm)	8.54	8.00	9.50
Applied force (kN)	96.77	60.00	120.00