Some effects of friction damping occurring in joints on the frequency response of a portal frame are presented and discussed. The frame was designed so that the joint clamping forces could be varied, allowing some control of the friction damping caused by interfacial slip in the joints. It was found that a joint clamping force less than that required to tightly fasten a joint gave a minimum frame response: reducing the clamping force from 15 kN to 320 N caused a reduction in frame response of 21 dB. Some changes in resonance frequencies were also observed.

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