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Steady state rocking response of rigid blocks part 2: Experiment

✍ Scribed by C. M. Wong; W. K. Tso

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
882 KB
Volume
18
Category
Article
ISSN
0098-8847

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✦ Synopsis

The results of an experimental investigation on the rocking response of rigid blocks subjected to sinusoidal base motion is presented. It is shown that two common types of steady state response are harmonic and 1/3 subharmonic response. The measured steady state response amplitudes correlate well with theoretical predictions for both harmonic and 1/3 subharmonic responses. Within each type of steady state response, theoretical studies show that the system may respond in either a symmetric or an unsymmetric mode. A symmetric mode denotes that the block oscillates about a mean zero position while an unsymmetric mode implies the mean position of oscillation is at an inclined position. One form of unsymmetric response was observed in the experiment. In addition, almost periodic responses were also observed in the experiment, although their existence has not been reported in theoretical studies.

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