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Figure 2. Displacement-controlled loading protocol of the experiment
Figure 4 shows the experimental hysteresis loops of connection between steel side plates and vertical member for the four different pretension forces
Table 1 summarizes the equivalent viscous damping ratio at 0.04 rads for four different pretension forces where it is clearly indicated that increase of hysteretic damping due to pretension in bolts significantly increases the damping ratio of the joints
Table 1. Equivalent viscous damping ratio (eq) at cyclic rotation of 0.04 rads

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