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RSFJ hysteresis responses

 The following cyclic hysteresis responses below illustrate the effect of connection parameters on joint performance comprising the variations in magnitude of the slip force, ultimate capacity, restoring force, residual resistance, joint displacement and hysteresis damping ratio ranging from 10% to 15% (ξhyst).

The connection design parameters consist of the angle of the groove, coefficient of friction (CoF), number of disc springs in series and parallel, number of bolts, and the initial prestressing force of the bolts.

As shown in the diagrams below, by adopting a higher CoF (through different material arrangements for the sliding surfaces) and increasing the clamping force (by using more bolts), the frictional resistance may be adjusted through a wide range.

By comparing the connection parameters effect on the hysteresis damping ratio, it can be determined that only the groove angle has a detrimental effect on the ξhyst. Increasing the CoF, number of disc springs in parallel, and also the prestressing force result in a larger ξhyst while increasing the number of disc springs in series and number of bolts have no effect.

1.  Groove angle

2.  Coefficient of friction

3.  Number of bolts

4.  Number of washers (in parallel)

5.  Number of washers (in series)

6.  Prestressing force