What is it about?
The paper studies a balanced impact damper (BID) with a vertically suspended impact body colliding with shock absorbing rubber. The impact body is suspended by coil springs to sustain its deadweight and centralize it within the gap, and collides with the stopper when its amplitude exceeds the specified gap width. The stopper is covered by a shock-absorbing rubber made of polyurethane gel.
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Why is it important?
A balanced impact damper (BID) can suppress vibrations of a floor slab subjected to walking and vertical seismic excitations. The suspended impact body can oscillate even under small excitations, and repetitive collisions with the shock absorbing rubber dissipate the imparted energy, thereby suppressing the vertical vibrations of the object.
Perspectives
The effects of the proposed BID are unaffected by the natural period of suspension of the impact body, and the natural period of suspension does not need to be maintained in the neighborhood of the fundamental period of the main structure during a service period, in contrast with the conventional TMD. The proposed BID is able to stably and silently dampen transient short excitations such as walking and vertical seismic activity; thus, it is a novel response control device that can enhance the comfort and livability of floor slabs and long-span structures.
Dr Yutaka Nakamura
Institute of Technology, Shimizu Corporation
Read the Original
This page is a summary of: Effects of balanced impact damper in structures subjected to walking and vertical seismic excitations, Earthquake Engineering & Structural Dynamics, August 2015, Wiley,
DOI: 10.1002/eqe.2619.
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