Response attenuation in a large-scale structure subjected to blast excitation utilizing a system of essentially nonlinear vibration absorbers

In these large-scale structures, the SSVI NES dissipated significant energy during the highly energetic initial phase through consecutive inelastic impacts and redistribution and dissipation of a portion of energy at high frequency modes.

“In these large-scale structures, the SSVI NES was able to dissipate significant amount of energy during the highly energetic initial phase of excitation through consecutive inelastic impacts and the redistribution and dissipation of portion of the energy at high frequency modes.”

Vibro-impact NESs have shown a unique performance in experiments where the highest energy motion in the initial stage was efficiently reduced and therefore the structure was protected.

“As demonstrated in [109,110], the VI NESs have shown a unique performance in the experiments where the highest energy motion in the initial stage was efficiently reduced and therefore the structure was protected.”

After first successful realization of SSVI NES in a 2-story linear primary structure, a series of publications followed on a large-scale 9-story structure coupled with two SSVI NES in the eighth and ninth floors.

“After the first successful realization of SSVI NES in [107] in which a 2-story linear primary structure was considered, series of publications in which a large-scale 9-story structure coupled with two SSVI NES in the eighth and ninth floors followed [106,109,110].”

The SSVI NES caused quick modal energy transfer, and this portion of energy was dissipated through the modes of the structure.

“The SSVI NES caused quick modal energy transfer where this portion of energy was dissipated through the modes of the structure.”

The largest test bed for TET testing is the 11-ton 9-story steel frame structure investigated in [106,109,110] for seismic and shock mitigations using SSVI NESs and Type I NESs.

“To the author's knowledge, the largest test bed for TET testing is the 11-ton 9-story steel frame structure investigated in [106,109,110] for seismic and shock mitigations using SSVI NESs and Type I NESs.”

In [110], optimization for blast response mitigation in a large-scale real structure was carried out in two stages: first optimizing attached Type-I NESs with the eighth floor to eliminate significant energy from the first torsional mode, then optimizing remaining NESs to eliminate significant energy from the lowest frequency lateral oscillation mode.

“In [110], which presented blast response mitigation in a large-scale real structure, the optimization was carried out in two stages.Firstly, the attached Type-I NESs with the eight floor were optimized to eliminate significant portion of energy from the first torsional mode.The remaining NESs were optimized in a second stage to eliminate significant portion of energy from the lowest frequency”

The large structure was able to withstand different intensity blasts, representing the first real blast successful response attenuation for large-scale structures.

“The large structure was able to withstand different intensity blasts and thus this work is considered as a main advancement in the field of experimental investigations of NES systems because it represents the first real blast successful response attenuation for large-scale structures.”

Most research works related to SSVI NESs contained experimental evaluations.

“One important observation deduced from the review conducted is that most research works related to SSVI NESs [107, 109, 110] contained experimental evaluations.”

The SSVI NESs demonstrated immediate response to impulsive loading and were activated in the early energy stage to redistribute energy to higher modes and to Type I NESs.

“The SSVI NESs demonstrated immediate response to impulsive loading where they were activated in the early energy stage of motion to redistribute energy to the higher modes and to Type I NESs which were added to the structure because they activate at a later stage to further enhance energy dissipation.”